Terminology page
(sneak preview)
| Term (plus Abbreviation) | Description or expanded abbreviations | Appears in |
| 1DM | One-way Delay Measurement Message | MEF 35 |
| 3GPP | 3rd Generation Partnership Project | MEF 22.1 |
| A | See – Availability | MEF 22.1 |
| AAA | Authentication, Authorization, Accounting | BBF TR-178 |
| AAL1 | ATM Adaptation Layer 1 | MEF 8 |
| Access EPL | See – Access Ethernet Private Line | MEF 33 |
| Access Ethernet Private Line (Access EPL) | Access EPL service uses a Point-to-Point OVC to associate one OVC End Point at a UNI and one OVC End Point at an ENNI. One UNI can support only a single instance of the Access EPL service | MEF 33 |
| Access Ethernet Virtual Private Line (Access EVPL) | Access EVPL service uses a Point-to-Point OVC to associate one OVC End Point at a UNI and one OVC End Point at an ENNI. One UNI can support one or more Access EVPL instances | MEF 33 |
| Access EVPL | See – Access Ethernet Virtual Private Line | MEF 33 |
| Access Link | A link that represents connectivity to External Reference Points of the MEN | MEF 2 |
| Access Provider (AP) | An Operator MEN that offers the Ethernet Access Service type | MEF 33 |
| ACR | Adaptive Clock Recovery | MEF 22.1 |
| ADM | Add Drop Multiplexer | MEF 2 |
| ADSL | Asymmetric Digital Subscriber Line | BBF TR-178 |
| AF | Adaptation Function | MEF 12.1 |
| aGW | Access Gateway in Wimax or LTE networks. Also referred to as Access Service Network (ASN) Gateway in Wimax and S-GW/MME in LTE. In this IA aGW is one of the options for a RAN NC | MEF 22.1 |
| AIS | Alarm Indication Signal | MEF 3, 8, 20, 25, 30, 31, 38, 39 |
| Alarm Status | Indicates the occurrence of an abnormal condition. Values for alarm status include: critical, major, minor, indeterminate, warning, pending, and cleared | MEF 15 |
| All to One Bundling | A UNI attribute in which all CE-VLAN IDs are associated with a single EVC | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 29 |
| ALNP | Aggregated Line and Node Protection | MEF 2 |
| AN | Access Node | BBF TR-178 |
| ANSI | American National Standards Institute | MEF 3, 8 |
| AP | See – Access Provider | MEF 33 |
| APCP | Application Protection Constraint Policy | MEF 2 |
| API | Application Programming Interface | MEF 38, 39 |
| APP | Application Services Layer | MEF 4, 12.1, 17 |
| APS | Automatic Protection Switching | MEF 2, 3 |
| ARP | Address Resolution Protocol | BBF TR-178 |
| ASP | Application Service Provider | MEF 22.1 |
| ATM | Asynchronous Transfer Mode | MEF 4, 8 |
| ATS | Abstract Test Suite | MEF 22.1 |
| AUC | ALA User Connection | BBF TR-178 |
| Availability (A) | Availability | MEF 35 |
| Availability flr | The Availability flr (in contrast with FLR) is the ratio of lost frames over a small interval of time ∆t (e.g. 1 sec). | MEF 35 |
| Availability Indicator | A binary indication of whether an interval ∆t is available or not. | MEF 35 |
| Availability Performance | A measure of the percentage of time that a service is useable | MEF 6.1, 10.2, 36 |
| Availability Window | A period of n consecutive intervals of ∆t, used to determine whether the Availability state has been entered or exited | MEF 35 |
| AVP | Attribute Value Pair | BBF TR-178 |
| Backward | OAM information sent from the Responder MEP to the Controller MEP. For LM it indicates the frame counts/loss from the Responder MEP to the Controller MEP. For DM is indicates the delay and delay variation from the Responder MEP to the Controller MEP | MEF 35, 36 |
| BAN | BNG-embedded Access Node | BBF TR-178 |
| Bandwidth Profile (BWP) | A characterization of Service Frame arrival times and lengths at a reference point and a specification of the disposition of each Service Frame | MEF 6.1, 7, 9, 11, 14, 15, 19, 27, 29, 33 |
| Bandwidth profile per CoS ID | A Bandwidth Profile per-Class of Service Identifier | MEF 6.1, 23.1, 33 |
| Bandwidth profile per EVC | A Bandwidth Profile applied on a per-EVC basis | MEF 6.1, 23.1 |
| Bandwidth Profile per OVC End Point | A Bandwidth Profile applied on a per-OVC End Point basis | MEF 23.1 |
| Bandwidth profile per OVC Endpoint | A Bandwidth Profile applied on a per-OVC End Point basis | MEF 33 |
| Bandwidth profile per UNI | A Bandwidth Profile applied on a per-EVC basis | MEF 6.1, 23.1, 33 |
| Bandwidth Profile per VUNI | A Bandwidth Profile applied on a per-VUNI basis | MEF 23.1 |
| BBER | Background Block Error Ratio | MEF 3 |
| BBF | Broadband Forum | MEF 30 |
| BER | Bit Error Rate | MEF 2, 3 |
| B-FP | Branch Flow Point | MEF 12.1 |
| BGP | Border Gateway Protocol | BBF TR-178 |
| BIR | Burst Information Rate; rate in bits per second of service frames transmitted, back-to-back with minimum inter-frame gap. It does not include the inter-frame gap, preamble nor start of frame delimiter. It is called “Burst information rate” because it is equal to the maximum information rate at which bursts can be sent | MEF 37 |
| BLSR | Bi-directional Line Switched Ring | MEF 2, 3 |
| BNG | Broadband Network Gateway | BBF TR-178 |
| BPDU | Bridge Protocol Data Unit | MEF 2 |
| BR-FP | Branch-Root Flow Point | MEF 12.1 |
| BRG | Bridged Residential Gateway | BBF TR-317 |
| BRG-LAN | BRG-Local Area Network Interface | BBF TR-317 |
| BRG-LSL | BRG-Logical Subscriber Link Interface | BBF TR-317 |
| Broadcast Service Frame | A Service Frame that has the broadcast destination MAC address | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 33 |
| BSC | Base Station Controller | MEF 22.1 |
| BSS | Business Support System | MEF 31, 36, 38, 39 |
| BTS | Base Transceiver Station | MEF 22.1 |
| Bundled OVC | A non-Rooted Multipoint OVC that associates an OVC End Point that has more than one S-VLAN ID value that maps to it | MEF 26.1 |
| Bundling | A UNI attribute in which more than one CE-VLAN ID is associated with an EVC | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 29 |
| BW | Bandwidth | MEF 20, 32 |
| BWP | See – Bandwidth Profile | MEF 12.1, 23.1, 37 |
| CAS | Channel Associated Signaling | MEF 3, 8 |
| CBOR | Concise Binary Object | RFC 7049 |
| CBS | See – Committed Burst Size | MEF 6.1, 7, 8, 10.2, 11, 13, 14, 15, 19, 22.1, 23.1, 27, 29, 33 |
| CCM | Continuity Check Message | MEF 20, 25, 30, 31, 36 |
| CCS | Common Channel Signaling | MEF 3, 8 |
| CDMA | Common Channel Signaling | MEF 22.1 |
| CE | Carrier Ethernet | BBF TR-178 |
| CEN | Carrier Ethernet Network (used interchangeably with Metro Ethernet Network, MEN). Also referred to as MEN Operator or MEN Service Provider. The entity providing the backhaul service for a Mobile Operator | MEF 12.1, 22.1 |
| CES | Circuit Emulation Service(s) | MEF 2, 3, 7, 8, 15, 22.1 |
| CESoETH | Circuit Emulation Services over Ethernet | MEF 8 |
| CE-VLAN CoS | See – Customer Edge VLAN CoS | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 23.1, 27, 29 |
| CE-VLAN CoS ID | Customer Edge VLAN CoS. Also C-tag PCP | MEF 33 |
| CE-VLAN CoS ID Value Preservation (OVC) | CE-VLAN CoS ID Value Preservation describes a relationship between the format and certain field values of the frame at one External Interface and of the corresponding frame at another External Interface | MEF 33 |
| CE-VLAN CoS Preservation (CE-VLAN CoS Preservation) | CE-VLAN CoS Preservation | MEF 6.1 |
| CE-VLAN ID | See – Customer Edge VLAN ID | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 27, 29, 33, 34 |
| CE-VLAN ID / EVC Map (CE-VLAN ID / EVC Map) | CE-VLAN ID / EVC Map | MEF 6.1 |
| CE-VLAN ID Preservation | An EVC attribute in which the CE-VLAN ID of an egress Service Frame is identical in value to the CE-VLAN ID of the corresponding ingress Service Frame | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 29 |
| CE-VLAN ID Preservation (OVC) | CE-VLAN ID Preservation describes a relationship between the format and certain field values of the frame at one External Interface and of the corresponding frame at another External Interface | MEF 33 |
| CE-VLAN ID/EVC Map | An association of CE-VLAN IDs with EVCs at a UNI | MEF 7, 9, 10.2, 11, 14, 15, 19, 27 |
| CE-VLAN Tag | See – Customer Edge VLAN Tag | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 23.1, 27, 29, 33 |
| CF | See – Coupling Flag | MEF 6.1, 8, 10.2, 14, 15, 19, 22.1, 23.1, 29, 33 |
| CFM | Connectivity Fault Management | MEF 20, 30, 31, 36, 38, 39 |
| CH | Compute Host | ETSI NFV |
| CHD | Compute Host Descriptor | ETSI NFV |
| Child Document | A MEF Specification that uses the Ethernet Service Constructs model (defined in this specification) to specify a particular type of EI or ESN | MEF 29 |
| CHLI | See – Consecutive High Loss Interval | MEF 10.21, 22.1, 26.1, 35, 36 |
| CI | Characteristic Information | MEF 4, 12.1 |
| CIR | See – Committed Information Rate | MEF 2, 6.1, 7, 8, 10.2, 11, 13, 14, 15, 19, 22.1, 23.1, 27, 29, 33 |
| CIR-compliant | Service frames that are compliant with the CIR of the bandwidth profile. CIR-compliant service frames are colored green | MEF 7, 15 |
| Circuit Emulation Service | A service that transports TDM-based traffic over a Metro Ethernet Network | MEF 7, 15 |
| Class of Service (“CoS”) Label | A Class of Service Name. Each CoS Label identifies four Performance Tiers where each Performance Tier contains a set of performance objectives and associated parameters | MEF 34 |
| Class of Service (CoS) | A set of Service Frames that have a commitment from the Service Provider to receive a particular level of performance | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 27, 29, 30 |
| Class of Service Frame Set (CoS FS) | A set of Service or ENNI Frames that have a commitment from the Operator or Service Provider subject to a particular set of performance objectives | MEF 23.1, 33, 33 |
| Class of Service Identifier (CoS ID) | The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name that applies to the frame at a given EI | MEF 6.1, 9, 10.2, 14, 19, 29 |
| Class of Service Identifier CoSID | Information derivable from a) the EVC to which the Service Frame is mapped or b) the combination of the EVC to which the Service Frame is mapped and a set of one or more CE-VLAN CoS values | MEF 27 |
| Class of Service Identifier for EFO | The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name that applies to the frame at a given ENNI that maps to an OVC End Point | MEF 23.1 |
| Class of Service Identifier for EFV | The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name that applies to the frame at a given ENNI that maps to a VUNI End Point | MEF 23.1 |
| Class of Service Identifier for ENNI Frames (ENNI) | The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name that applies to the frame at a given ENNI that maps to an OVC End Point | MEF 33 |
| Class of Service Identifier for Service Frames | The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name that applies to the frame at a given UNI | MEF 23.1 |
| Class of Service Identifier for Service Frames (UNI) | The mechanism and/or values of the mechanism to be used to identify the Class of Service Name that applies to the frame at a given UNI | MEF 33 |
| Class of Service Label | A CoS Name. Each Class of Service Label identifies four Performance Tiers where each Performance Tier contains a set of performance objectives and associated parameters | MEF 23.1, 33 |
| Class of Service Name | A designation given to one or more sets of performance objectives and associated parameters by the Service Provider or Operator | MEF 23.1, 33 |
| Class of Service Performance Objective | An objective for a given performance metric | MEF 23.1 |
| CLE | Customer Located Equipment | MEF 17 |
| CLI | Command Line Interface | MEF 15 |
| CM | See – Color Mode | MEF 6.1, 10.2, 14, 15, 19, 22.1, 23.1, 29, 33 |
| CMS | Cloud Management System | ETSI NFV |
| CO | Central Office | BBF TR-178 |
| Color Forwarding | An OVC attribute defining the relationship between the Color of an egress ENNI Frame and the Color of the corresponding ingress ENNI Frame or Service Frame | MEF 26.1, 34, 37 |
| Color ID | The mechanism and/or values of the parameters in the mechanism used to identify the Color that applies to the frame at a given external interface | MEF 22.1, 23.1 |
| Color Identifier for EFO | The mechanism and/or values of the parameters in the mechanism used to identify the Color that applies to the frame at a given ENNI that maps to an OVC End Point | MEF 23.1 |
| Color Identifier for EFV | The mechanism and/or values of the parameters in the mechanism used to identify the Color that applies to the frame at a given ENNI that maps to a VUNI End Point | MEF 23.1 |
| Color Identifier for ENNI Frames (ENNI) | The mechanism and/or values of the parameters in the mechanism used to identify the Color that applies to the frame at a given ENNI that maps to an OVC End Point. A particular Color ID value may indicate Color instance of Green or Yellow for an ENNI Frame. PCP may indicate both Class of Service Name and Color. Information derivable from a) a set of one or more S-Tag PCP values or b) DEI value | MEF 33 |
| Color Identifier for Service Frame | The mechanism and/or values of the parameters in the mechanism used to identify the Color that applies to the frame at a given UNI | MEF 23.1 |
| Color Identifier for Service Frame (UNI) | The mechanism and/or values of the parameters in the mechanism used to identify the Color that applies to the frame at a given UNI. A particular Color ID value may indicate Color instance of Green or Yellow for a Service Frame. PCP and DSCP may indicate both Class of Service Name and Color. Information derivable from a) a set of one or more C-Tag PCP values or b) a set of one or more DSCP values | MEF 33 |
| Color Mode (CM) | CM is a Bandwidth Profile parameter. The Color Mode parameter indicates whether the color-aware or color-blind property is employed by the Bandwidth Profile. It takes a value of “color-blind” or “color-aware” only | MEF 6.1, 10.2, 14, 19, 23.1, 27, 29, 33 |
| Color-aware | A Bandwidth Profile property where a pre-determined level of Bandwidth Profile compliance for each Service Frame is taken into account when determining the level of compliance for each Service Frame | MEF 6.1, 7, 10.2, 14, 15, 19, 22.1, 23.1, 29, 33 |
| Color-blind | A Bandwidth Profile property where a pre-determined level of Bandwidth Profile compliance for each frame, if present, is ignored when determining the level of compliance by the CEN | MEF 6.1, 7, 10.2, 14, 15, 19, 23.1, 29, 33 |
| Committed Burst Size (CBS) | CBS is a Bandwidth Profile parameter. It limits the maximum number of bytes available for a burst of frames sent at the EI speed to remain CIR-conformant | MEF 6.1, 7, 10.2, 11, 14, 15, 19, 23.1, 27, 29, 33 |
| Committed Information Rate (CIR) | CIR is a Bandwidth Profile parameter. It defines the average rate in bits/s of frames at an EI up to which the network delivers those frames, and is committed to meeting the performance objectives defined by the CoS Service Attribute | MEF 6.1, 7, 10.2, 11, 14, 15, 19, 23.1, 27, 29, 33 |
| Connected Sub-Network (CSN) | A Sub-Network that is connected by physical External Interfaces to the Ethernet Sub-Network under examination (see Figure 4) | MEF 29 |
| Consecutive High Loss Interval (CHLI) | A sequence of small time intervals contained in T, each with a high frame loss ratio | MEF 10.21, 26.1 |
| Controller MEP | The Controller MEP initiates SOAM PM PDUs, and in a single-ended session receives responses from the Responder MEP | MEF 35, 36 |
| CoS | See – Class of Service | MEF 6.1, 7, 8, 10.2, 12.1, 15, 17, 20, 23.1, 25, 30, 31, 32, 33, 35, 36, 38, 39 |
| CoS Frame Set | Class of Service Frame Set: A set of frames that have a commitment from the Operator or Service Provider subject to a particular set of performance objectives | MEF 22.1, 34, 35 |
| CoS FS | See – Class of Service Frame Set | MEF 23.1, 35 |
| CoS ID | See – Class of Service Identifier | MEF 12.1, 20, 22.1, 23.1, 35 |
| CoS ID for SOAM PM frames | Class of Service Identifier for SOAM PM frames. The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name (H, M, L) that applies to a given SOAM frame | MEF 35 |
| CoS Identifier for EFO | The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name that applies to the frame at a given ENNI that maps to an OVC End Point | MEF 34 |
| CoS Identifier for Service Frames | The mechanism and/or values of the parameters in the mechanism to be used to identify the Class of Service Name that applies to the frame at a given UNI | MEF 34 |
| CoS Label | A Class of Service Name. Each CoS Label identifies four Performance Tiers where each Performance Tier contains a set of performance objectives and associated parameters | MEF 22.1 |
| CoS Name | Class of Service Name: A designation given to one or more sets of performance objectives and associated parameters by the Service Provider or Operator | MEF 22.1, 34, 35 |
| COSE | CBOR Object Signing and Encryption | draft-ietf-cose-msg |
| Coupling Flag (CF) | The choice between two modes of operation of the bandwidth profile algorithm. It takes a value of 0 or 1 only | MEF 6.1, 10.2, 14, 15, 19, 23.1, 29, 33 |
| CoV | Coefficient of Variation | MEF 35 |
| CPE | Customer Premise Equipment | MEF 17 |
| CPE-WAN interface | CPE-WAN interface | BBF TR-317 |
| CPO | CoS Performance Objective | MEF 22.1, 23.1, 34 |
| CR | Clock Recovery | MEF 3 |
| C-RAN | Cloud Radio Access Network | ETSI NFV |
| CRC | Cyclic Redundancy Check | MEF 2, 3, 8 |
| CSC | “Closed” Service Chain | SD-326 |
| CSG | Cell Site Gateway | BBF TR-178 |
| CSN | See – Connected Sub-Network | MEF 29 |
| CSP | Cloud Service Provider | ETSI NFV |
| CSPF | Constriant-based Shortest Path First | MEF 2 |
| C-Tag | Subscriber VLAN Tag | MEF 23.1, 26.1, 31, 34, 37 |
| C-Tag frames | IEEE 802.1ad Ethernet frames with one tag: C-Tag. The values of the C-VLAN IDs are in the range between 1 and 4094 | MEF 37 |
| CUET | Customer Unit Edge Terminal | MEF 3 |
| Current Problem List | Identifies the current existing problems (probable cause), with severity for an entity | MEF 15 |
| Customer | The organization purchasing and/or using Ethernet Services. Alternate term: Subscriber | MEF 7, 15 |
| Customer Edge | Equipment on the Subscriber side of the UNI | MEF 6.1, 7, 7, 9, 10.2, 11, 14, 15, 15, 19, 23.1, 27, 29, 33 |
| Customer Edge VLAN CoS (CE-VLAN CoS) | The Priority Code Point bits in the IEEE 802.1Q Customer VLAN Tag in a Service Frame that is either tagged or priority tagged | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 23.1, 27, 29, 33 |
| Customer Edge VLAN ID (CE-VLAN ID) | The identifier derivable from the content of a Service Frame that allows the Service Frame to be associated with an EVC at the UNI | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 27, 29, 33 |
| CVLAN | Customer VLAN | ETSI NFV |
| C-VLAN | Customer VLAN | MEF 12.1 |
| DA | Destination Address | MEF 20 |
| Data Service Frame | A Service Frame that is Unicast, Multicast, or Broadcast | MEF 10.2 |
| DCE | Data Circuit-terminating Equipment | MEF 2 |
| DEI | Drop Eligible Indicator | MEF 12.1, 23.1, 31, 35 |
| DI | Data Instance | MEF 16, 24 |
| DM | Delay Measurement | MEF 35, 36 |
| DMM | Delay Measurement Message | MEF 35 |
| DMR | Delay Measurement Response | MEF 35 |
| DNU | Do not use | MEF 22.1 |
| Double-tagged frames | IEEE 802.1ad Ethernet frames with two tags. The outer tag is an S-Tag, the inner tag is a C-Tag | MEF 37 |
| Down MEP | A MEP residing in a Bridge that receives SOAM PDUs from, and transmits them towards, the direction of the LAN. See also Up MEP | MEF 20, 25, 30 |
| DP | Distribution Point | BBF TR-301 |
| DPU | Distribution Point Unit | BBF TR-301 |
| DSCP | Differentiated Services Code Point | MEF 22.1, 23.1, 26.1, 29, 37 |
| DSL | Digital Subscriber Line | MEF 2 |
| DSTM | Derived System Timing Mode. The IWF system clock is derived from the incoming Ethernet frames | MEF 3 |
| DTE | Data Terminal Equipment | MEF 21 |
| DTM | Derived Timing Mode. The recovered service clock is derived from the incoming Ethernet frames | MEF 3 |
| Dual Rate Bandwidth Profile | A bandwidth profile that specifies both a CIR/CBS and EIR/EBS | MEF 7, 15 |
| Dual-Ended | A type of process where a MEP sends measurement information to a peer MEP that will perform the calculations | MEF 35, 36 |
| Duplicate | Link Aggregation Group | MEF 2 |
| DUT | Device Under Test | MEF 18 |
| E-Access Service Type | Ethernet services that use an OVC with at least one UNI OVC End Point and one ENNI OVC End Point | MEF 33 |
| EAF | ETH Adaptation Function | MEF 12.1 |
| EBS | See – Excess Burst Size | MEF 6.1, 7, 8, 10.2, 11, 13, 14, 15, 19, 22.1, 23.1, 27, 29, 33 |
| E-BWP | Egress Bandwidth Profile. A service attribute that specifies the length and arrival time characteristics of egress Service Frames at the egress UNI | MEF 22.1 |
| EC | ETH Connection | MEF 12.1, 22.1 |
| ECDX | Emulated Circuit De/Multiplexing Function | MEF 3, 8 |
| ECF | ETH Connection Function | MEF 2, 12.1 |
| ECID | Emulated Circuit Identifier | MEF 3, 8 |
| ECS | EC Segment | MEF 12.1 |
| ECT | Ethernet Connectionless Trail/Ethernet Connection-oriented Trail | MEF 12.1 |
| EEAF | Ethernet ECS Adaptation Function | MEF 35 |
| EEC | Ethernet Equipment Clock | MEF 22.1 |
| EEIF | Eth EC Interconnect Function | MEF 35 |
| EEPP | End-to-End Path Protection | MEF 2 |
| EETF | ETH EVC Termination Function | MEF 12.1 |
| EFCF | ETH Flow Conditioning Function | MEF 12.1 |
| EFD | ETH Flow Domain | MEF 12.1 |
| EFM | Ethernet First Mile | MEF 2 |
| EFO | ENNI Frame that maps to OVC End Point | MEF 23.1, 34 |
| EFP | Ethernet Flow Point | BBF TR-178 |
| EFT | Eth Flow Termination | MEF 3 |
| EFTF | ETH Flow Termination Function | MEF 8, 12.1 |
| EFV | ENNI Frame that maps to a VUNI End Point | MEF 23.1 |
| Egress Bandwidth Profile | A service attribute that specifies the length and arrival time characteristics of egress Frames at the egress EI | MEF 6.1, 10.2, 23.1, 29, 33 |
| Egress EI Frame | An Ethernet Frame transmitted across the EI from the ESN toward the CSN | MEF 29 |
| Egress Frame | A Service Frame sent from the Service Provider network to the CE | MEF 7, 11 |
| Egress Service Frame | A Service Frame sent from the Service Provider network to the CE | MEF 6.1, 9, 10.2, 14, 15, 19, 27, 29, 33 |
| EI | See – External Interface | MEF 12.1, 22.1, 23.1, 29, 32, 33, 35 |
| EI Frame | An Ethernet frame transmitted across the EI toward the ESN or an Ethernet frame transmitted across the EI toward the CSN | MEF 29 |
| EIR | See – Excess Information Rate | MEF 2, 6.1, 7, 8, 10.2, 11, 13, 14, 15, 19, 22.1, 23.1, 27, 29, 33 |
| EIR-compliant | Service frames that are compliant with the EIR of the bandwidth profile. EIR-compliant service frames may be colored green or yellow depending upon whether they are CIR-compliant or not, respectively | MEF 7, 15 |
| E-LAN | An Ethernet service type that is based on a Multipoint-to-Multipoint EVC | MEF 2, 6.1, 9, 10.2, 14, 19, 20, 23.1, 27, 30, 33, 35 |
| E-Line | An Ethernet service type that is based on a Point-to-Point EVC | MEF 2, 3, 6.1, 8, 9, 10.2, 14, 19, 20, 23.1, 27, 30, 33 |
| E-LMI | Ethernet Local Management Interface | MEF 15, 17, 20, 24, 30 |
| EMS | Element Management System | MEF 17, 25, 30, 31, 35, 36, 38, 39 |
| eNB | Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B is the Radio Base Station in LTE. Also referred to as eNodeB or eNB. In this IA an eNodeB is one of the options for a RAN BS | MEF 22.1 |
| End Point Map | A mapping of specified S-Tag VLAN ID values to specified OVC End Point Identifiers | MEF 26.1, 37 |
| End Point Map Bundling | When multiple S-VLAN ID values map to a single OVC End Point in the End Point Map, and the OVC associating that OVC End Point is not a Rooted-Multipoint OVC | MEF 26.1 |
| End Point Type | A parameter in the End Point Map (In this specification the End Point Type is always OVC End Point.) | MEF 26.1, 37 |
| ENNI | External Network Network Interface | MEF 12.1, 12.1, 15, 15, 17, 23.1, 26.1, 30, 31, 32, 33, 34, 35, 37, 38, 39 |
| E-NNI | External Network Network Interface | BBF TR-178 |
| ENNI Frame | The first bit of the Destination Address to the last bit of the Frame Check Sequence of the Ethernet Frame transmitted across the ENNI | MEF 23.1, 26.1, 33, 34, 37 |
| ENNI MEG | External Network-to-Network Interface Maintenance Entity Group | MEF 30 |
| ENNI MTU | MTU of an ENNI frame at the ENNI | MEF 26.1, 33, 37 |
| ENNI-Ni | The functional element administered by the Operator of the ith Operator MEN that supports the protocols and procedures required in MEF 26.1 | MEF 12.1, 26.1, 30, 37 |
| ENS | See – Ethernet Network Section | MEF 23.1 |
| EoS | Ethernet over SONET | MEF 2 |
| EoSONET | Ethernet over SONET | MEF 17 |
| EPCF | ETH Provider Conditioning Function | MEF 12.1, 35 |
| EPL | Ethernet Private Line Service | MEF 6.1, 8, 22.1, 23.1, 32, 33 |
| EP-LAN | Ethernet Private LAN Service | MEF 22.1, 32 |
| EP-Tree | Ethernet Private Tree Service | MEF 22.1, 32 |
| ES | Errored Second | MEF 3, 8 |
| ESC | See – Ethernet Service Construct | MEF 29 |
| ESCF | ETH Subscriber Conditioning Function | MEF 12.1, 17, 35 |
| ESD | Ethernet Services Definition | MEF 4 |
| ESF | Extended Super Frame | MEF 3, 8 |
| ESM | Ethernet Services Model | MEF 4 |
| ESMC | Ethernet Synchronization Message Channel | MEF 22.1 |
| ESMC Frame | A Frame exchanged between a MEN and the RAN CE when UNI PHY is in synchronous operation mode | MEF 22.1 |
| ESN | See – Ethernet Sub-Network | MEF 29 |
| ESNC | See – Ethernet Sub-Network Connection | MEF 29 |
| ESNC End Point | A logical reference point located at a physical External Interface (EI) | MEF 29 |
| ESR | Errored Second Ratio | MEF 3, 8 |
| ESRG | ETH-layer SRG | MEF 22.1 |
| ETF | ETH Termination Function | MEF 12.1 |
| ETH | Ethernet Services Layer | MEF 2, 4, 12.1, 17 |
| ETH FPP | An Ethernet Flow Point Pool that represents an Ethernet UNI or E-NNI | MEF 15 |
| ETH-AIS | Ethernet Alarm Indication Signal function | MEF 25, 30, 31, 38, 39 |
| ETH-CC | Ethernet Continuity Check function | MEF 30, 31, 38, 39 |
| ETH-DM | Ethernet Delay Measurement function | MEF 35, 36 |
| Ethernet Access Provider | Operator of the MEN providing the OVC-based Ethernet service between a UNI and an ENNI | MEF 33 |
| Ethernet Frame | A data packet on a wire from preamble to FCS | MEF 35 |
| Ethernet LAN Service Type | An Ethernet Service Type distinguished by its use of a Multipoint-to-Multipoint EVC | MEF 9, 10.2, 14, 19 |
| Ethernet Line Service Type | An Ethernet Service Type distinguished by its use of a Point-to-Point EVC | MEF 9, 10.2, 14, 19 |
| Ethernet Network Section (ENS) | A set of one or more MENs, each under a single or collaborative jurisdictional responsibility, for the purpose of managing CPOs | MEF 23.1 |
| Ethernet Service Construct (ESC) | An abstract entity used to facilitate describing the externally visible behavior of an Ethernet Sub-Network (ESN) as seen by looking into the physical demarcation points of this ESN. The four basic types of Ethernet Service Constructs introduced in this document are EIs, ESNCs, ESNC End Points, and TEs. Each of these entities represents a collection of defined attributes that are used to describe this behavior | MEF 29 |
| Ethernet Sub-Network (ESN) | The Sub-Network that is under examination by the Ethernet Service Constructs model (see Figure 4) | MEF 29 |
| Ethernet Sub-Network Connection (ESNC) | An association of two or more ESNC End Points that limits the exchange of EI frames to EIs in the ESNC | MEF 29 |
| Ethernet Virtual Connection (EVC) | An association of two or more UNIs that limits the exchange of Service Frames to UNIs in the Ethernet Virtual Connection | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 23.1, 29, 33 |
| EtherType | Ethernet Length/Type | MEF 12.1 |
| ETH-LB | Ethernet Loopback function | MEF 30, 31, 38, 39 |
| ETH-LCK | Ethernet Lock signal function | MEF 31, 38, 39 |
| ETH-LM | Ethernet Loss Measurement function | MEF 35, 36 |
| ETH-LT | Ethernet Linktrace function | MEF 30, 31, 38, 39 |
| ETH-RDI | Ethernet Remote Defect Indication function | MEF 31, 38, 39 |
| ETH-SLM | Ethernet Synthetic Loss Measurement Function | MEF 35, 36 |
| ETH-Test | Ethernet Test function | MEF 31, 38, 39 |
| ETH-trail | An ETH-trail is an “ETH-layer entity” responsible for the transfer of information from the input of a trail termination source to the output of a trail termination sink | MEF 2 |
| E-Tree | An Ethernet service type that is based on a Rooted-Multipoint EVC | MEF 6.1, 23.1, 27, 30, 33 |
| ETY | Ethernet Physical Layer | MEF 7, 15 |
| EVC | Ethernet Virtual Connection | BBF TR-178 |
| EVC ID | The Identifier for an EVC | MEF 20 |
| EVC Maximum Transmission Unit Size | The maximum sized Service Frame allowed for an EVC | MEF 10.2 |
| EVC MEG | Ethernet Virtual Connection Maintenance Entity Group | MEF 30 |
| EVC MTU Size | The maximum sized Service Frame allowed for an EVC | MEF 6.1, 33 |
| EVC-MA | Ethernet Virtual Connection Maintenance Association | MEF 25 |
| EVPL | Ethernet Virtual Private Line Service | MEF 6.1, 8, 22.1, 23.1, 32, 33 |
| EVP-LAN | Ethernet Virtual Private LAN Service | MEF 22.1, 23.1, 32 |
| EVP-Tree | Ethernet Virtual Private Tree Service | MEF 22.1, 32 |
| E-WAN | An MEF defined ETH services aware network that provides connectivity between two or more MENs via ENNIs | MEF 26.1 |
| Excess Burst Size (EBS) | EBS is a Bandwidth Profile parameter. It limits the maximum number of bytes available for a burst of Service or ENNI Frames sent at the EI speed to remain EIR-conformant | MEF 6.1, 7, 10.2, 11, 14, 15, 19, 23.1, 29, 33 |
| Excess Information Rate (EIR) | EIR is a Bandwidth Profile parameter. It defines the average rate in bits/s of Service or ENNI Frames up to which the network may deliver Service or Network Frames but without any performance objectives | MEF 6.1, 7, 10.2, 11, 14, 15, 19, 23.1, 29, 33 |
| External Interface (EI) | External Interface. These can be one of those defined in MEF 4, 12.1 | MEF 23.1, 26.1, 29, 33, 34, 37 |
| FCS | Frame Check Sequence | MEF 8, 12.1, 35 |
| FD | See – Frame Delay | MEF 6.1, 10.2, 14, 15, 19, 22.1, 23.1, 30, 32, 33, 34, 35, 36 |
| FDL | Facility Data Link | MEF 3, 8 |
| FDR | See – Frame Delay Range | MEF 22.1, 23.1, 33, 34, 35, 36 |
| FDV | See – Frame Delay Variation | MEF 6.1, 14, 17, 19, 22.1, 30, 32 |
| FDX | Full Duplex | MEF 6.1, 7, 15 |
| FE | Functional Element | MEF 4 |
| FER | Frame Error Ratio | MEF 3, 8 |
| FLR | See – Frame Loss Ratio | MEF 6.1, 10.2, 14, 17, 19, 22.1, 23.1, 30, 32, 33, 34, 35, 36 |
| FM | Fault Management | MEF 22.1, 25, 30, 31, 36, 38, 39 |
| Forward | OAM information sent from the Controller MEP to the Responder MEP. For LM it indicates the frame counts/loss from the Controller MEP to the Responder MEP. For DM is indicates the delay and delay variation from the Controller MEP to the Responder MEP | MEF 35, 36 |
| FP/FPP | Flow Point/Flow Point Pool | MEF 12.1 |
| Frame | Short for Ethernet Frame | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 23.1, 29, 33 |
| Frame Delay (FD) | The time required to transmit a frame from ingress EI to egress EI | MEF 6.1, 10.2, 11, 14, 15, 19, 23.1, 33 |
| Frame Delay Performance | A characterization of the delays experienced by different frames belonging to the same CoS Frame Set | MEF 6.1, 10.2, 14, 15, 19, 23.1, 33 |
| Frame Delay Range (FDR) | The difference between the observed percentile of delay at a target percentile and the observed minimum delay for the set of frames in time interval T | MEF 10.2, 23.1, 33 |
| Frame Delay Range Performance | A measure of the extent of delay variability experienced by different frames belonging to the same CoS Frame Set | MEF 10.2, 23.1, 33 |
| Frame Delay Variation (FDV) | The difference in delay of two frames of the same CoS Frame Set | MEF 6.1, 14, 15, 19 |
| Frame Delay Variation Performance | A characterization, based on Inter-Frame Delay Variation, of the variation in the delays experienced by different frames belonging to the same CoS Frame Set | MEF 6.1, 14, 15, 19 |
| Frame Loss | A performance attribute of an EVC | MEF 11 |
| Frame Loss Ratio (FLR) | Frame Loss Ratio is a characterization of the number of lost Frames between the ingress External Interface (EI) and the egress External Interface (EI). Frame Loss Ratio is expressed as a percentage | MEF 6.1, 10.2, 14, 15, 19, 23.1, 33 |
| G-ACh | Generic Associated Channel | BBF TR-178 |
| GAL | G-ACh Label | BBF TR-178 |
| GARP | Generic Attribute Registration Protocol | MEF 2, 20 |
| GbE | Gigabit Ethernet | MEF 4 |
| GIWF | Generic Inter-working Function | MEF 22.1 |
| GPON | Gigabit Passive Optical Networks IGMP | BBF TR-178 |
| GRE | Generic Routing Encapsulation | MEF 2 |
| GSM | Global System for Mobile communication | MEF 22.1 |
| HDX | Half Duplex | MEF 7, 15 |
| H-FP | Hairpin Flow Point | MEF 12.1 |
| High Loss Interval (HLI) | A small time interval contained in T with a high frame loss ratio | MEF 10.21, 26.1 |
| HLI | See – High Loss Interval | MEF 10.21, 22.1, 26.1, 35, 36 |
| H-NID | Hybrid NID | MEF 12.1 |
| HNS | Hybrid NID Service | MEF 12.1 |
| HOVC | Higher Order Virtual Container | MEF 3 |
| IA | Implementation Agreement | MEF 3, 8, 20, 22.1, 23.1, 30, 35 |
| I-BWP | Ingress Bandwidth Profile. A characterization of ingress Service Frame arrival times and lengths at the ingress UNI and a specification of disposition of each Service Frame based on its level of compliance with the characterization | MEF 22.1 |
| IE | Information Element | MEF 15 |
| IEEE | Institute of Electrical and Electronics Engineers | MEF 4, 8, 30, 31, 35, 36, 38, 39 |
| IETF | Internet Engineering Task Force | MEF 2, 3, 8, 16, 30, 31, 36, 38, 39 |
| IFDV | See – Inter-Frame Delay Variation | MEF 10.2, 22.1, 23.1, 33, 34, 35, 36 |
| IGP | Interior Gateway Protocol | MEF 2 |
| II | Internal Interface | MEF 12.1 |
| Ingress | The direction from the CE into the Service Provider network | MEF 13 |
| Ingress Bandwidth Profile | A characterization of frame arrival times and lengths at the ingress EI and a specification of disposition of each frame based on its level of compliance with the characterization | MEF 6.1, 10.2, 23.1, 29, 33 |
| Ingress Frame | A frame transmitted across the EI toward the CEN | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 23.1, 29, 29, 33 |
| I-NNI | Internal Network-Network Interface | BBF TR-178 |
| Inter-Frame Delay Variation (IFDV) | The difference in delay of two frames of the same CoS Frame Set | MEF 10.2, 23.1, 33 |
| Inter-Frame Delay Variation Performance | A characterization, based on Inter-Frame Delay Variation, of the variation in the delays experienced by different frames belonging to the same CoS Frame Set | MEF 10.2, 23.1, 33 |
| IP | Internet Protocol | BBF TR-178 |
| IPSec | Internet Protocol Security | MEF 22.1 |
| ITU | International Telecommunication Union | MEF 2, 4, 16 |
| ITU-T | ITU Telecommunication Standardization Sector | MEF 3, 8, 30, 31, 35, 36, 38, 39 |
| IVC | Infrastructure Virtual Circuit | BBF TR-178 |
| IWF | Interworking Function | MEF 3, 4, 8 |
| L1 | Layer One | MEF 4 |
| L2 | Layer Two | MEF 4 |
| L2+ | Layer(s) above L2 | MEF 4 |
| L2CP | Layer 2 Control Protocol | MEF 12.1, 20, 22.1, 23.1, 29 |
| L2CP Frame | See – Layer 2 Control Protocol Service Frame | MEF 33 |
| L2CP Tunneling | The process by which a frame containing a Layer 2 Control Protocol is transferred between External Interfaces | MEF 26.1 |
| L2DP | Layer Two Data Plane | MEF 12.1 |
| L2F | Layer 2 Forwarding | BBF TR-178 |
| L2TP | L2 Tunneling Protocol | BBF TR-178 |
| LACP | Link Aggregation Control Protocol | MEF 2, 20 |
| LAG | Link Aggregation Group | MEF 2, 20, 29 |
| LAN | Local Area Network | MEF 2, 4, 12.1, 30, 31, 35, 36, 38, 39 |
| LANE | ATM LAN Emulation | MEF 17 |
| Layer 2 Control Protocol Service Frame (L2CP Frame) | A frame that is used for Layer 2 control, e.g., Spanning Tree Protocol | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 23.1, 29, 33 |
| Layer 2 Control Protocol Tunneling | The process by which a frame carrying a Layer 2 Control Protocol Service data unit is passed through the Service Provider or Operator network without being processed and is delivered to the proper EI(s) | MEF 6.1, 7, 9, 10.2, 11, 14, 15, 19, 23.1, 29, 33 |
| LB | Loop Back | MEF 20 |
| LBM | Loopback Message | MEF 20, 25, 30, 31, 38, 39 |
| LBR | Loopback Reply | MEF 20, 25, 30, 31, 38, 39 |
| LCK | Locked, used in reference to LCK PDUs | MEF 31, 38, 39 |
| LDP | Label Distribution Protocol | BBF TR-178 |
| Leaf OVC End Point | An OVC End Point that has the role of Leaf | MEF 26.1 |
| Link | An ETH link or TRAN link | MEF 2 |
| Link OAM | OAM specific to a single link as per clause 57 of [IEEE 802.3] | MEF 20 |
| Link Protection Mechanism (LPM) | Any mechanism (e.g. LAG) used to protect traffic in the event of link failure across an EI with multiple links | MEF 29 |
| LLC | Logical Link Control | MEF 12.1 |
| LM | Loss Measurement | MEF 35, 36 |
| LMM | Loss Measurement Message | MEF 35 |
| LMR | Loss Measurement Reply | MEF 35 |
| LOF | Loss of Frame | MEF 2 |
| LOFA | Loss of Frame Alignment | MEF 8 |
| LOFS | Loss of Frames State | MEF 8 |
| LOH | Line OverHead | MEF 3 |
| LOPS | Loss Of Packet Synchronization | MEF 3 |
| LOS | Loss of Signal | MEF 2, 3, 8 |
| LOVC | Lower Order Virtual Container | MEF 3 |
| LPM | See – Link Protection Mechanism | MEF 29 |
| LSL | Logical Subscriber Link | BBF TR-317 |
| LSP | Label Switched Path | MEF 2 |
| LSR | Label Switched Router | MEF 2 |
| LTE | Long Term Evolution | MEF 22.1 |
| LTE. | Line Termination Equipment | MEF 3 |
| LTM | Linktrace Message | MEF 30, 31, 38, 39 |
| LTR | Linktrace Reply | MEF 30, 31, 38, 39 |
| MA | Maintenance Association (equivalent to a MEG) | MEF 25, 30, 31, 35, 36, 38, 39 |
| MAC | Media Access Control | MEF 2, 4, 8, 12.1, 16, 17, 24, 25, 30, 31, 35, 36, 38, 39 |
| MAID | Maintenance Association Identifier (equivalent to a MEG ID) | MEF 25, 30, 31, 35, 38, 39 |
| Maintenance Interval | A Maintenance Interval is a time interval agreed to by the Service Provider and Subscriber during which the service may not perform well or at all | MEF 35 |
| MAN | MPLS enabled Access Node | BBF TR-178 |
| MANO | (NFV) Management and Organization | ETSI NFV |
| MAP | Multi-Access Point | |
| Mapper | A device or logic that implements a mapping function | MEF 3 |
| Mapping | The process of associating each bit transmitted by the service into the SDH/SONET payload structure that carries the service. For example, mapping a DS1 service into SONET VT-1.5 / SDH VC-11 associate each bit of the DS1 with a location in the VT-1.5/VC-11 | MEF 3 |
| Maximum Number of CE-VLAN IDs per OVC | An integer that indicates the quantity of CE-VLANs that can be mapped to a single OVC at that UNI. A value = 1 indicates that UNI can only map single CE-VLANs to an OVC. A value > 1 indicates that up to that limit can be mapped to a single OVC | MEF 33 |
| Maximum Number of EVCs | The maximum number of EVCs that may be on a UNI | MEF 6.1 |
| Maximum Number of OVCs per UNI | The maximum number of OVCs that may be on a UNI | MEF 33 |
| Maximum number of UNIs (MNU) | The maximum number of UNIs that may be in an EVC | MEF 6.1, 10.2 |
| Maximum Transmission Unit (MTU) | The maximum sized Service Frame allowed for an Ethernet service | MEF 33 |
| MBSFN | Multimedia Broadcast Multicast Service (MBMS) Single Frequency Network support | MEF 22.1 |
| MCF | MAC Convergence Function | MEF 12.1 |
| MD | Maintenance Domain | MEF 20, 25, 30, 31, 35, 36, 38, 39 |
| MD Level | Maintenance Domain Level (equivalent to a MEG level) | MEF 25, 31, 35, 36, 38, 39 |
| ME | Maintenance Entity | BBF TR-178 |
| Mean Frame Delay Performance | The arithmetic mean, or average of delays experienced by frames belonging to the same CoS Frame Set | MEF 10.2, 23.1, 33 |
| Mean time to restore | The mean time from when a service is unavailable to the time it becomes available again | MEF 2 |
| Measurement Bin | A Measurement Bin is a counter that stores the number of delay measurements falling within a specified range, during a Measurement Interval | MEF 35, 36 |
| Measurement Interval | A period of time during which measurements are taken. Measurements initiated during one Measurement Interval are kept separate from measurements taken during other Measurement Intervals. It is important to note that this is different from T | MEF 35, 36 |
| Measurement Interval Data Set | The collection of completed measurements that were initiated during a Measurement Interval | MEF 35 |
| MEF | Metro Ethernet Forum | MEF 2, 4, 16, 30, 31, 35, 36, 38, 39 |
| MEG | Maintenance Entity Group | BBF TR-178 |
| MEG ID | Maintenance Entity Group Identifier. Equivalent to Maintenance Association Identifier (MAID) | MEF 30, 31, 38, 39 |
| MEG Level | Maintenance Entity Group Level (equivalent to MD Level) | MEF 20, 30, 31, 35, 36, 38, 39 |
| MEL | Maintenance Entity Level | MEF 12.1 |
| MEN | Metro Ethernet Network. Synonymous with CEN (Carrier Ethernet Network) | MEF 2, 3, 4, 6.1, 7, 8, 9, 12.1, 15, 16, 17, 23.1, 26.1, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 |
| MEN-bound IWF | The IWF receiving TDM data from the customer’s TDM-based equipment, and forwarding this data in the form of Ethernet frames into the MEN | MEF 8 |
| ME-NE | See – Metro Ethernet Network Element | MEF 15 |
| MEP | Maintenance Association End Point (IEEE) or MEG End Point (ITU) | MEF 17, 20, 22.1, 25, 30, 31, 35, 36, 38, 39 |
| MEP ID | Maintenance Entity End Point Identification | MEF 20 |
| Metro Ethernet Network | The Operator’s or Service Provider’s network providing Ethernet services. Synonymous with Carrier Ethernet Network (CEN) | MEF 6.1, 7, 15, 23.1, 33 |
| Metro Ethernet Network Element (ME-NE) | The Operator’s or Service Provider’s network providing Ethernet services. Synonymous with Carrier Ethernet Network (CEN) | MEF 15 |
| MFD | Mean Frame Delay | MEF 22.1, 23.1, 33, 34, 35, 36 |
| MGT EC | Management EC | MEF 12.1 |
| MHF | MIP Half Function | MEF 30, 38 |
| MIB | Management Information Base | MEF 3, 8, 31, 36, 38, 39 |
| Minimum Inter-Frame Gap | Defined as 96 Bit Times [section 4.4.2 in IEEE Std 802.3-2005] | MEF 37 |
| MIP | Maintenance domain Intermediate Point(IEEE) or MEG Intermediate Point (ITU) | MEF 17, 20, 30, 31, 35, 36, 38, 39 |
| MME | Mobility Management Entity is an LTE function and located in the Network Controller site. In this IA MME is included when referring to a RAN NC | MEF 22.1 |
| MNU | See – Maximum Number of UNIs | MEF 6.1, 10.2 |
| Mobile Operator | The entity obtaining the Backhaul service from a SP or MEN Operator. Also referred to as Subscriber in this IA | MEF 22.1 |
| MP | Maintenance Point. One of either a MEP or a MIP | MEF 25, 30, 35, 36, 38, 39 |
| MPLS | Multi Protocol Label Switching | MEF 2, 4, 17 |
| MPtMP | Multi-point to multi-point | BBF TR-178 |
| MR | Marketing Report (BBF Term for published informational and positioning papers) | |
| MRTIE | Maximum Relative Time Interval Error | MEF 18 |
| MS-BNG | Multi Service BNG | BBF TR-178 |
| MTP | Multipoint | MEF 12.1 |
| MTU | See – Maximum Transmission Unit | MEF 6.1, 20, 22.1, 25, 26.1, 30, 31, 33, 34, 35, 37, 38, 39 |
| MTU size | The maximum sized Service Frame allowed for an Ethernet service | MEF 6.1 |
| Multicast Service Frame | A Service Frame that has a multicast destination MAC address | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 33 |
| Multiplex | Transmit one or more channels over a single channel | MEF 3 |
| Multipoint-to-Multipoint EVC | An EVC with two or more UNIs | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 23.1, 29, 33 |
| Multipoint-to-Multipoint OVC | An OVC that can associate two or more Root OVC End Points | MEF 26.1 |
| N/A | Not Applicable | MEF 6.1, 23.1, 33 |
| N/S | Not Specified | MEF 6.1, 7, 15, 22.1, 23.1, 33 |
| NaaS | Network as a Service | ETSI NFV |
| NDD | Network Demarcation Device | MEF 17 |
| NE | Network Element | MEF 2, 3, 4, 12.1, 17, 20, 22.1, 25, 30, 31, 32, 35, 36, 38, 39 |
| NERG | Network Enhanced Residential Gateway | BBF TR-317 |
| NETCONF | The Network Configuration Protocol | MEF 38, 39 |
| NETCONF Client | A NETCONF entity that nvokes protocol operations on a NETCONF server. In addition, a client can subscribe to receive notifications from a server | MEF 38, 39 |
| NETCONF Server | A NETCONF entity that executes protocol operations invoked by a NETCONF client. In addition, a server can send notifications to a client | MEF 38, 39 |
| NF | Network Function | ETSI NFV |
| NF Forwarding Graph | Network Function Forwarding Graph | |
| NF Set | Network Function Set | ETSI NFV |
| NFV | Network Functions Virtualisation | ETSI NFV |
| NFV Framework | Network Function Virtualization Framework | ETSI NFV |
| NFV Orchestrator | Network Function Virtualization Orchestrator | ETSI NFV |
| NFVI | Network Function Virtualization Infrastructure | ETSI NFV |
| Nf-Vi | NFVI – Virtualized Infrastructure Manager | ETSI NFV |
| NFVIaaS | Network Functions Virtualization Infrastructure as a Service | ETSI NFV |
| NFVI-Node | Network Functions Virtualisation Infrastructure Node | ETSI NFV |
| NFVI-PoP | Network Function Virtualisation Infrastructure Point of Presence | ETSI NFV |
| NFV-MANO | Network Functions Virtualisation Management and Orchestration | ETSI NFV |
| NFVO | Network Functions Virtualisation Orchestrator | ETSI NFV |
| NFV-Res | NFV Resource | ETSI NFV |
| NG | Smallest compliant value of WG for a given bandwidth profile | MEF 37, 37 |
| NGMN | Next Generation Mobile Networks NID | BBF TR-178 |
| NI- | Network Interworking (e.g., NI-NNI) | MEF 4 |
| NIC | Network Interface Controller NS Network Service | ETSI NFV |
| NID | Network Interface Device | MEF 12.1 |
| NI-NNI | Network Interworking NNI | MEF 17 |
| NMI | NID-MEN Interface | MEF 12.1 |
| NMI-C | NMI – Client (Functional Element) | MEF 12.1 |
| NMI-N | NMI – Network (Functional Element) | MEF 12.1 |
| NMS | Network Management System | MEF 17, 25, 30, 31, 35, 36, 38, 39 |
| NNI | Network Network Interface | MEF 3, 4, 12.1, 17, 30, 31, 38, 39 |
| Node | A Provider owned network element | MEF 2, 4, 12.1, 17, 30, 31, 38, 39 |
| NodeB | WCDMA Radio Base Station. In this IA a NodeB is one of the options for a RAN BS | MEF 22.1 |
| N-PoP | Network Point of Presence | ETSI NFV |
| NPVR | Network Personal Video Recorder | ETSI NFV |
| NS | Network Slice | Ericsson |
| NSP | Network Service Provider | MEF 22.1 |
| NT | Network Termination | MEF 4 |
| NTP | Network Time Protocol | MEF 22.1 |
| NUNI | NID UNI | MEF 12.1 |
| NY | Smallest compliant value of WY for a given bandwidth profile | MEF 37 |
| OAM | Operations Administration and Maintenance | BBF TR-178 |
| OAM Domain | The part of a network for which faults in connectivity can be managed and performance can be monitored. (equivalent to a “Maintenance Domain”) | MEF 25, 30, 35 |
| OAM Flow Space | The portions of an end-to-end flow where SOAM frames are seen as SOAM frames (as opposed to being seen as data frames when double tagged) | MEF 30, 30, 35 |
| OAMPDU | Operation Administration and maintenance protocol data unit | MEF 21 |
| O-EC | Operator EC | MEF 12.1 |
| OFDMA | Orthogonal frequency division multiple access | Wi-Fi Alliance |
| On-Demand | OAM actions that are initiated via manual intervention for a limited time to carry out diagnostics. On-Demand OAM can result in singular or periodic OAM actions during the diagnostic time interval | MEF 35, 36 |
| One-way | A measurement performed in the forward or backward direction. For example from MEP A to MEP B or from MEP B to MEP A | MEF 35, 36 |
| Operator | The administrative organization responsible for a CEN | MEF 23.1, 26.1, 29, 34, 37 |
| Operator MEG | Operator Maintenance Entity Group | MEF 30 |
| Operator Virtual Connection (OVC) | An association of OVC End Points | MEF 23.1, 26.1, 33, 34, 37 |
| Operator-MA | Operator Maintenance Association | MEF 25 |
| OPNFV | Open Platform for NFV | OPNFV |
| Ordered Pair of UNIs | A directional UNI pair of the form , selected from the UNI list for the EVC of interest | MEF 10.2 |
| Or-Vi | Orchestrator – Virtualized Infrastructure Manager | ETSI NFV |
| Or-Vnfm | Orchestrator – VNF Manager | ETSI NFV |
| Os-Ma | OSS/BSS – NFV Management and Orchestration | ETSI NFV |
| OSS | Operations Support System | MEF 31, 36, 38, 39 |
| OTN | Optical Transport Network | MEF 4 |
| OVC | See – Operator Virtual Connection | MEF 23.1, 26.1, 30, 32, 33, 34, 35, 37, 38, 39 |
| OVC End Point (OVC EP) | An association of an OVC with a specific External Interface i.e., UNI, ENNI | MEF 23.1, 26.1, 33, 34, 37 |
| OVC End Point Map at the UNI | An association of CE-VLAN IDs with OVCs at a UNI | MEF 33 |
| OVC End Point Role | A property of an OVC End Point that determines the forwarding behavior between it and other OVC End Points that are associated with the OVC End Point by an OVC | MEF 26.1, 26.1, 30, 32, 33, 34, 35, 37, 38, 39 |
| OVC EP | See – OVC End Point | MEF 23.1, 34 |
| OVC Identifier | string that is unique among all OVCs in the Operator MEN | MEF 26.1, 33, 34, 37 |
| OVF | Open Virtualization Format | ETSI NFV |
| P2P | Point-to-point | MEF 12.1, 25, 30, 35 |
| PaaS | Platform as a Service | ETSI NFV |
| Path | A succession of interconnected links at a specific (ETH or TRANS) layer | MEF 2, 34 |
| pBG | Physical Business Gateway | BBF TR-328 |
| PC | Policy Controller | BBF TR-178 |
| PCEF | Policy and Charging Enforcement Function | MEF 22.1, 33, 34, 37 |
| PCP | Priority Code Point | MEF 22.1, 23.1, 30, 35 |
| pCPE | Physical CPE | BBF TR-328 |
| pCPE-LSL interface | BBF TR-317 | |
| Pd | Frame Delay Performance percentile | MEF 23.1 |
| PDH | Plesiochronous Digital Hierarchy. PDH refers to the DS1/DS2/DS3 and E1/E3/E4 family of signals | MEF 3, 4, 8, 22.1 |
| PDU | Protocol Data Unit | MEF 8, 12.1, 20, 25, 30, 31, 35, 36, 38, 39 |
| PE | Provider Edge | MEF 2, 3, 4, 12.1 |
| PEC | Packet based Equipment Clocks | MEF 22.1, 4, 8, 22.1 |
| Performance Tier (PT) | A MEF CoS Performance Objectives (CPO) set | MEF 23.1, 12.1, 20, 25, 30, 31, 35, 36, 38, 39 |
| PHB | Per Hop Behavior | BBF TR-178 |
| PICS | Protocol implementation conformance statement | MEF 21, 3, 4, 12.1 |
| PLL | Phase Locked Loop | MEF 3 |
| PM | Performance Monitoring | MEF 22.1, 35, 36 |
| PM Function | A MEP capability specified for performance monitoring purposes (e.g., Single-Ended Delay, Single-Ended Synthetic Loss) | MEF 35, 36 |
| PM Session | A PM Session is the application of a given PM Function between a given pair of MEPs and using a given CoS Frame Set over some (possibly indefinite) period of time | MEF 35, 36 |
| PM Solution | A PM Solution is a set of related requirements that when implemented allow a given set of performance metrics to be measured using a given set of PM functions | MEF 35, 36 |
| PM Tool | A generic term used to discuss the application of a PM Function | MEF 35, 36 |
| PNF | Physical Network Function | ETSI NFV |
| Pointer | A part of the SDH/SONET overhead that locates a floating payload structure. Frequency differences between SDH/SONET network elements or between the payload and the SDH/SONET equipment can be accommodated by adjusting the pointer value | MEF 3, 36 |
| Point-to-Point EVC | An EVC with exactly 2 UNIs | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 23.1, 29, 33 |
| Point-to-Point OVC | An OVC that associates exactly two Root OVC End Points | MEF 26.1, 36 |
| PON | Passive Optical Network | BBF TR-178 |
| POP | Point of Presence | BBF TR-178 |
| PPP | Point to Point Protocol | BBF TR-178 |
| PPVPNS | Provider Provisioned Virtual Private Network Service | ETSI NFV |
| Pr | A specific percentile of the Frame Delay Performance used in Frame Delay Range , where Pv>0 | MEF 23.1 |
| PRBS | Pseudo-Random Binary Sequence | MEF 18, 7, 9, 10.2, 11, 13, 14, 15, 19, 23.1, 29, 33 |
| PRC | Primary Reference Clock | MEF 22.1 |
| PRM | Protection Reference Model | MEF 2 |
| Proactive | OAM actions that are carried on continuously to permit timely reporting of fault and/or performance status | MEF 35, 36 |
| Protection merge point | A point in which the protection path traffic is either merged back onto the working path or passed on to the higher layer protocols (used in [3], called ‘tail-end switch’ in SONET/SDH) | MEF 2 |
| PRS | Primary Reference Source | MEF 3 |
| PSN | Packet Switched Network | BBF TR-178 |
| PSTN | Public Switched Telephone Network | MEF 3 |
| PT | Polling Timer | MEF 24 |
| PtP | Point to Point | BBF TR-178 |
| Pv | Inter-Frame Delay Variation Performance percentile | MEF 23.1 |
| PVT | Polling Verification Timer | MEF 24 |
| PW | Pseudo Wire | MEF 17 |
| PWE3 | Pseudo-Wire Emulation Edge to Edge (an IETF working group) | MEF 3, 8 |
| QL | Quality Level of clock used in Synchronous Ethernet | MEF 22.1 |
| QoS | Quality of Service | MEF 2 |
| Qualified Set of Service Frames | The set of frames that comply with specific criteria, such as the arrival time at the Ingress UNI and Bandwidth Profile compliance, on which a performance attribute is based | MEF 10.2 |
| RAN | Radio Access Network | MEF 22.1 |
| RAN BS | RAN Base Station | MEF 22.1 |
| RAN CE | RAN Customer Edge | MEF 22.1 |
| RAN NC | RAN Network Controller | MEF 22.1 |
| RBS | Radio Base Station defined in this IA and referred generally as Base Station in 3GPP TS 21.905 | MEF 22.1 |
| RDI | Remote Defect Indication | MEF 3, 8, 20, 25, 30, 31, 38, 39 |
| Remote UNI (RUNI) | Remote UNI is a UNI serving as the UTA component consisting of a collection of service attributes in the UNI within an Operator’s MEN. The remote UNI is paired with a VUNI in a VUNI Provider’s MEN. At the remote UNI, Service Frames are exchanged between the Subscriber and the Network Operator MEN | MEF 28 |
| Resiliency Performance | The number of High Loss Intervals and Consecutive High Loss Intervals in a time interval T | MEF 10.21, 26.1, 36 |
| Responder MEP | In a single-ended session, the Responder MEP receives SOAM PM PDUs, from the Controller MEP, and transmits a response to the Controller MEP | MEF 35, 36 |
| RFC | Request For Comment. (The term for IETF published technical work) | MEF 30, 31, 35, 36, 38, 39 |
| RG | Residential Gateway | BBF TR-178 |
| RI | Reference Implementation | NIST |
| RMI | Remote Management Interface | MEF 12.1 |
| RMP | Rooted Multipoint | MEF 12.1 |
| RNC | Radio Network Controller | MEF 22.1 |
| Root OVC End Point | An OVC End Point that has the role of Root | MEF 26.1 |
| Rooted-Multipoint | MEF Point to Multipoint service; see [MEF 10.1] | MEF 20 |
| Rooted-Multipoint EVC | A multipoint EVC in which each UNI is designated as either a Root or a Leaf. Ingress Service Frames at a Root UNI can be delivered to one or more of any of the other UNIs in the EVC. Ingress Service Frames at a Leaf UNI can only be delivered to one or more Root UNIs in the EVC | MEF 6.1, 10.2, 23.1, 33 |
| Rooted-Multipoint OVC | An OVC that can associate at least one Leaf or Trunk OVC End Point | MEF 26.1 |
| RPC | Remote Procedure Call | MEF 38, 39 |
| RPR | Resilient Packet Ring | MEF 2, 4 |
| RSTP | Rapid Spanning Tree Protocol | MEF 2 |
| RTP | Real-time Transport Protocol | MEF 8, 22.1 |
| RUNI | See – Remote UNI | MEF 30 |
| RUNI-N | Remote UNI-N (Functional Element) | MEF 12.1 |
| S | When applied to an EVC it is a non-empty subset of ordered UNI pairs and when applied to an OVC it’s a non-empty subset of ordered OVC End Point pairs | MEF 23.1, 35 |
| SaaS | Software as a Service | ETSI NFV |
| Scheduled Downtime | A time interval agreed upon by both the Subscriber and Service Provider during which a service may be disabled by the Service Provider | MEF 10.2 |
| SDH | Synchronous Digital Hierarchy | MEF 2, 3, 4 |
| SDN | Software Defined Networking | ONF |
| SDO | Standards Development Organization | MEF 32 |
| SDR | Software Defined Radio | ETSI NFV |
| S-EC | Subscriber EC | MEF 12.1 |
| Segment | A connected subset of the trail | MEF 2 |
| Se-Ma | Service, VNF and Infrastructure Description – NFV Management and Orchestration | ETSI NFV |
| SEP | Service End Point | MEF 32 |
| Service Frame | An Ethernet frame transmitted across the UNI toward the Service Provider or an Ethernet frame transmitted across the UNI toward the Subscriber | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 21, 23.1, 26.1, 29, 31, 33, 34, 35, 36, 37, 38, 39 |
| Service Frame Delivery | An EVC service attribute defined in [2] | MEF 6.1 |
| Service Level Agreement (SLA) | The contract between the Subscriber and Service Provider specifying the agreed to service level commitments and related business agreements | MEF 6.1, 7, 10.2, 14, 15, 19, 23.1, 33 |
| Service Level Specification (SLS) | The technical specification of service level (including performance) | MEF 6.1, 7, 10.2, 14, 15, 19, 23.1, 33 |
| Service Multiplexing | A UNI service attribute in which the UNI can be in more than one EVC instance | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 29, 33 |
| Service OAM | Service OAM is OAM used to monitor an individual Service; see [ITU-T Y.1731] and [IEEE 802.1ag] | MEF 20 |
| Service Provider (SP) | The organization providing UNI to UNI Ethernet service(s) | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 23.1, 26.1, 29, 33, 34, 37 |
| SES | Severely Errored Second | MEF 3 |
| SESR | Severely Errored Second Ratio | MEF 3 |
| SF | Super Frame | MEF 3, 8 |
| S-GW | Serving Gateway is an LTE function and located at the Network Controller site. In this IA S-GW is one of the options for RAN NC | MEF 22.1 |
| SI | Sample Implementation | Wikipedia |
| SI- | Service Interworking (e.g., SI-NNI) | MEF 4 |
| Single Rate Service | A service that only specifies a CIR/CBS and no EIR/EBS | MEF 7 |
| Single-Ended | A type of process where a MEP sends a measurement request and the peer MEP replies with the requested information so the originating MEP can calculate the measurement | MEF 35, 36 |
| Sink MEP | In a dual-ended session, the Sink MEP receives SOAM PM PDUs, from the Controller MEP and performs the performance calculations | MEF 35, 36 |
| SI-NNI | Service Interworking NNI | MEF 17 |
| SLA | See – Service Level Agreement | MEF 2, 3, 6.1, 7, 10.2, 14, 15, 17, 19, 22.1, 23.1, 33 |
| SLM | Synthetic Loss Message | MEF 35, 36 |
| SLR | Synthetic Loss Reply | MEF 35 |
| SLS | See – Service Level Specification | MEF 2, 3, 6.1, 7, 10.2, 12.1, 14, 15, 17, 19, 22.1, 23.1, 32, 33, 35 |
| SNI | Service Node Interface | MEF 4, 15, 17, 29 |
| S-NID | Service NID | MEF 12.1 |
| SNMP | Simple Network Management Protocol | MEF 31, 36, 38, 39 |
| SNMP Agent | An SNMP entity containing one or more command responder and/or notification originator applications (along with their associated SNMP engine). Typically implemented in an NE | MEF 36, 38, 39 |
| SNMP Manager | An SNMP entity containing one or more command generator and/or notification receiver applications (along with their associated SNMP engine). Typically implemented in an EMS or NMS | MEF 31, 36, 38, 39 |
| SOAM | Service Operations, Administration, and Maintenance | MEF 22.1, 25, 30, 31, 35, 36, 38, 39 |
| SOAM PDU | Service OAM Protocol Data Unit. Specifically, those PDUs defined in [IEEE 802.1ag], [ITU-T Y.1731], or MEF specifications | MEF 30, 31, 35, 36, 38, 39 |
| SOAM PM CoS ID | See CoS ID for SOAM PM frames | MEF 35 |
| SOAM PM Implementation | Capabilities of an NE that are required to support SOAM Performance Monitoring. Specifically, those PDUs defined in IEEE 802.1Q-2011 [24], ITU-T Y.1731 [1], or MEF specifications. In ITU-T documents the equivalent term OAM PDU is used | MEF 35 |
| SOAM PM PDU | Service OAM Protocol Data Unit specifically for Performance Measurement. Examples are LMM/LMR, DMM/DMR/1DM, SLM/SLR | MEF 35 |
| SON | Self Organizing Networks | ETSI NFV |
| SONET | Synchronous Optical Network | MEF 2, 3, 4 |
| SP | See – Service Provider | MEF 22.1, 30, 32 |
| SP-EC | Ethernet Connection across the SP | MEF 12.1, 22.1 |
| SRG | Shared Risk Group. Set of NEs that are collectively impacted by a specific fault or fault type | MEF 22.1 |
| SRLG | Shared Risk Link Group | MEF 2 |
| SSM | Synchronization Status Message | MEF 3, 22.1 |
| SSRC | Synchronization Source (a field within the RTP protocol, RFC 3550) | MEF 8 |
| S-Tag | Service Provider VLAN Tag | MEF 23.1, 26.1, 31, 33, 34, 37 |
| S-Tag frames | IEEE 802.1ad Ethernet frames with one tag: S-Tag. The values of the S-VLAN IDs are in the range between 1 and 4094 | MEF 37 |
| STP | Spanning Tree Protocol | MEF 2 |
| Structure-agnostic | Structure-agnostic emulation is the transport of unstructured TDM, or of structured TDM when the structure is completely disregarded by the transport mechanism | MEF 8 |
| Structure-aware | Structure-aware emulation is the transport of structured TDM taking at least some level of the structure into account | MEF 8 |
| Structure-indicated | Encapsulation utilized for Structure-Aware TDM transport where TDM structure boundaries are indicated by pointers | MEF 8 |
| Structure-locked | Encapsulation utilized for Structure-Aware TDM transport where TDM structure boundaries are indicated by packet payload boundaries | MEF 8 |
| Subscriber | The organization purchasing and/or using Ethernet Services. This may be an end user business organization or a mobile operator | MEF 2, 6.1, 7, 9, 10.2, 11, 13, 14, 15, 16, 19, 22.1, 23.1, 26.1, 29, 33, 34, 37 |
| Subscriber-MA | Subscriber Maintenance Association | MEF 25 |
| Subscriber-MEG | Subscriber Level Maintenance Entity Group | MEF 20,30 |
| SVLAN | Service VLAN | ETSI NFV |
| S-VLAN | Service VLAN (also referred to as Provider VLAN) | MEF 12.1 |
| S-VLAN ID | The 12 bit VLAN ID field in the S-Tag of an ENNI Frame | MEF 26.1, 33, 34, 37 |
| Synthetic Frame | An Ethernet frame created to emulate service traffic, carry additional information necessary to support calculating delay or loss and that is treated the same way as a Service Frame | MEF 35 |
| Synthetic Traffic | SOAM traffic that emulates service traffic in order to measure the performance experience. Delay measurements must use synthetic traffic, because user traffic does not contain standardized timestamp fields. Other measurements, such as Frame Loss, may also use synthetic frames for certain advantages (e.g., ability to measure loss in multipoint services) | MEF 35, 36, 39 |
| T | Time Interval for SLS Metrics. The time over which a Performance Metric is defined. T => Measurement Interval, and generally consists of multiple Measurement Intervals | MEF 10.21, 23.1, 35, 36 |
| TAF | Transport Adaptation Function | MEF 12.1 |
| Tag | An optional field in a frame header. In this document it is the 4-byte field that, when present, appears immediately after the Source Address, or another tag in an Ethernet frame header and which consists of the 2-byte Tag Protocol Identification Field (TPID) which indicates S-Tag or C-Tag, and the 2-byte Tag Control Information field (TCI) which contains the 3-bit Priority Code Point, and the 12-bit VLAN ID field | MEF 26.1, 33, 37 |
| TALS | TDM Access Line Service | MEF 3, 8 |
| TAP | Tunnel Attachment Process | MEF 12.1 |
| TAP-N | TAP – Network (Functional Element) | MEF 12.1 |
| TC | Textual Conventions | MEF 31, 36, 38, 39 |
| TCF | Transport Connection Function | MEF 2 |
| TCP | Transmission Control Protocol | MEF 2 |
| TDM | Time Division Multiplexing (examples include Nx64 kbit/s, T1, E3, OC-3, STM-1, OC-12) | MEF 2, 3, 8 |
| TDM-bound | The direction of travel of CESoETH frames within the IWF receiving frames containing emulated circuit data from the MEN, and forwarding TDM data to the customer’s TDM-based equipment | MEF 8 |
| TE | See – Tunnel End Point | MEF 29 |
| Test MEG | Test Maintenance Entity Group | MEF 30 |
| Tester | Special equipment used to generate and monitor traffic for verification purposes | MEF 9 |
| Test-MA | Test Maintenance Association | MEF 25 |
| Test-MEG | The MEG used by Service provider to test the connectivity to UNI-C | MEF 20 |
| TF | Termination Function | MEF 12.1 |
| TFP | Termination Flow Point | MEF 12.1 |
| T-FP | Trunk Flow Point | MEF 12.1 |
| TL-FP | Trunk Leaf Flow Point | MEF 12.1 |
| T-Line | TDM Line Service | MEF 3, 8 |
| TLS | Transparent LAN Services | BBF TR-178 |
| TLV | Type, Length and Value | MEF 16, 20, 21, 22.1, 24, 31, 36, 38, 39 |
| T-NID | Transport NID | MEF 12.1 |
| ToD | Time-of-day | MEF 35 |
| TPID | Tag Protocol Identifier | BBF TR-178 |
| TR | Technical Report (BBF Term for published technical work) | BBF TR-178 |
| Traffic Conditioning | A process that classifies the traffic units according to configured rules and ensures traffic is conformant before forwarding the traffic | MEF 35 |
| TRAN | Transport Layer | MEF 2, 4, 12.1, 17 |
| Transport | A specific TRANS layer technology | MEF 2 |
| TRAN-trail | A TRAN-trail (see ITU-T Recommendation G.805) is a “transport entity” responsible for the transfer of information from the input of a trail termination source to the output of a trail termination sink | MEF 2 |
| TrCP | Traffic Conditioning Point | MEF 17 |
| Trunk OVC End Point | An OVC End Point that has the role of Trunk | MEF 26.1 |
| TSP | TDM Service Processing | MEF 3, 8 |
| TST | Test PDU | MEF 31, 38, 39 |
| TTF | Trail Termination Function | MEF 2 |
| Tunnel End Point (TE) | An ESC that represents a collection of ESNC End Points at an EI. It is used to facilitate the description of the externally observable behavior of the case where multiple ESNCs are encapsulated into a single service stream within an ESN | MEF 29 |
| Two-way | A measurement of the performance of frames that flow from the Controller MEP to the Responder MEP and back again | MEF 35, 36 |
| UML | Unified Modeling Language | MEF 31, 36, 38, 39 |
| UNI | User Network Interface VLAN | BBF TR-178 |
| UNI ID | The Identifier for a UNI | MEF 20 |
| UNI Maximum Transmission Unit Size | The maximum sized Service Frame allowed at the UNI | MEF 10.2 |
| UNI MEG | User-to-Network Interface Maintenance Entity Group | MEF 30 |
| UNI MTU Size | The maximum sized Service Frame allowed at the UNI | MEF 6.1, 33 |
| UNI-C | The UNI-C is a compound architectural component of a CEN that represents all of the functions required to connect a subscriber to a CEN | MEF 2, 12.1, 15, 16, 19, 20, 21, 22.1, 24, 25, 27, 30 |
| Unicast Service Frame | A Service Frame that has a unicast destination MAC address | MEF 6.1, 7, 9, 10.2, 11, 13, 14, 15, 19, 29, 33 |
| UNI-EVC | The part of the EVC between the UNI-N and UNI-C | MEF 11 |
| UNI-EVCID | The ID that identifies the part of the EVC between the UNI-N and UNI-C. This can be derived from CE-VLAN ID, Physical Port, TRANS Tag or combination of these | MEF 11 |
| UNI-MA | User-to-Network Interface Maintenance Association | MEF 25 |
| UNI-MEG | UNI Maintenance Entity Group | MEF 20 |
| UNI-N | The UNI-N is a compound architectural component of a CEN that represents all of the functions required to connect a CEN to a CEN subscriber | MEF 2, 12.1, 15, 16, 19, 20, 21, 22.1, 24, 25, 27, 30 |
| Unscheduled Downtime | A time interval not agreed upon by both the Subscriber and Service Provider during which the Service Provider determines that the service is not usable | MEF 10.2 |
| Up MEP | A MEP residing in a Bridge that transmits SOAM PDUs towards, and receives them from, the direction of the Bridge Relay Entity. See also Down MEP | MEF 20, 25, 30 |
| UP/PCP | User Priority/Priority Code Point | MEF 12.1 |
| User Network Interface | The physical demarcation point between the responsibility of the Service Provider and the responsibility of the Subscriber | MEF 2, 6.1, 7, 9, 10.2, 11, 14, 15, 19, 21, 23.1, 29, 33 |
| USP | User Services Platform | WT-369 |
| UTA | The UNI Tunnel Access associates a VUNI and remote UNI and is composed of VUNI and remote UNI Components and at least one supporting OVC | MEF 12.1, 28 |
| UTA Component | A specific set of capabilities which may be used as part of UTA | MEF 28 |
| UTA OVC | An OVC in the Network Operator’s MEN that provides an association of a remote UNI with an ENNI in support of UTA | MEF 28 |
| UTC | Coordinated Universal Time | MEF 31, 35, 36, 39 |
| VA | Virtual Application | ETSI NFV |
| VAS | SD-326 | |
| vBG | Virtual Business Gateway | BBF TR-328 |
| VC | Virtual Container | MEF 3 |
| vCPE | Virtual CPE | BBF TR-328 |
| vCPE-LSL interface | BBF TR-317 | |
| vCPU | Virtualised CPU | ETSI NFV |
| vE-CPE | ||
| Ve-Vnfm | VNF/EMS – VNF Manager | ETSI NFV |
| vG | Virtual Gateway | BBF TR-317 |
| vG host | Virtual Gateway host | BBF TR-317 |
| vG-LSL | Virtual Gateway -Logical Subscriber Link Interface | BBF TR-317 |
| vG-WAN | Virtual Gateway-Wide Area Network Interface | BBF TR-317 |
| VIA | Virtual Infrastructure Architecture | ETSI NFV |
| VID | VLAN Identifier | MEF 25, 30, 31, 35, 38, 39 |
| VIM | Virtualised Infrastructure Manager | ETSI NFV |
| Vi-Vnfm | Virtualized Infrastructure Manager – VNF Manager | ETSI NFV |
| VLAN | Virtual Local Access Network | ETSI NFV |
| VLAN ID | VLAN Identifier | MEF 12.1 |
| Vl-Ha | Virtual Layer Hardware Resources | ETSI NFV |
| VM | Virtual Machine | ETSI NFV |
| VM Configuration | Virtual Machine Configuration | ETSI NFV |
| VM Image | Virtual Machine Image | ETSI NFV |
| VM Instance | Virtual Machine Instance | ETSI NFV |
| VNF | Virtual Network Function | ETSI NFV |
| VNF FG | VNF Forwarding Graph | ETSI NFV |
| VNF Set | VNF Set | ETSI NFV |
| VNFaaS | VNF as a Service | ETSI NFV |
| VNFC | Virtualised Network Function Component | ETSI NFV |
| VNFD | Virtualised Network Function Descriptor | ETSI NFV |
| VNFM | Virtualised Network Function Manager | ETSI NFV |
| VNIC | Virtual Network Interface Controller | ETSI NFV |
| Vn-Nf | VNF-NFV Infrastructure | |
| VNPaaS | Virtual Network Platform as a Service | ETSI NFV |
| vPE | Virtual Provider Edge (Router) | ETSI NFV |
| VPLS | Virtual Private LAN Service | MEF 12.1, 17, 17 |
| VPN | Virtual Private Network | IETF |
| VPWS | Virtual Private Wire Service | MEF 17 |
| vRG | Virtual Residential Gateway | BBF TR-317 |
| vSwitch | Virtualised Switch | ETSI NFV |
| VT | Virtual Tributary | MEF 3 |
| VTA | Virtual Test Appliance | ETSI NFV |
| VUNI | Virtual UNI (VUNI) is the component consisting of a collection of service attributes in the VUNI Provider’s MEN. The VUNI is paired with a remote UNI in a Network Operator’s MEN | MEF 12.1, 28, 30 |
| VUNI End Point | An End Point at the VUNI Provider’s side of a specific ENNI that associates the ENNI with a VUNI in support of UTA | MEF 28 |
| VUNI Provider | The Operator MEN providing the VUNI | MEF 28 |
| VUNI-N | VUNI – Network (Functional Element) | MEF 12.1 |
| WAN | Wide Area Network | MEF 4, 12.1 |
| WCDMA | Wideband Code Division Multiple Access | MEF 22.1 |
| WEN | Wide Area Ethernet Network | MEF 12.1 |
| WG | Working Group | BBF TR-178 |
| WiMAX | Worldwide Interoperability for Microwave Access | MEF 22.1 |
| WLAN | Wireless Local Area Network xAN | BBF TR-178 |
| WTR | Wait to Restore | MEF 2 |
| xSTP | Spanning Tree Protocol (multiple variations) | MEF 17 |
| YANG | A Data Modeling Language for NETCONF | MEF 38, 39 |