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- A
- AAL - ATM Adaptation Layer
- ABR - Available Bit Rate
- AIS - Alarm Indication Signal (UNI Fault Management)
- AII - Active Input Interface (Used in UNI PMD specs for Copper/Fiber)
- AOI - Active Output Interface (Used in UNI PMD specs for Copper/Fiber)
- API - Applications Program Interface
- ARP - Address Resolution Protocol
- AS - Autonomous System
- ASN - Autonomous System Number
- ASN.1 - Abstract Syntax Notation One
- Asynchronous - not limited to sending data during a set time slot; having different rates
- ATE - ATM Terminating Equipment (SONET)
- ATM - Asynchronous Transfer Mode
- ATM Layer
- AVSSCS - Audio-Visual Service Specific Convergence Sublayer
- B
- BECN - Backward Explicit Congestion Notification
- BER - Basic Encoding Rules (ASN.1)
- BER - Bit Error Rate (link quality specification/testing)
- BGP - Border Gateway Protocol
- BIP - Bit Interleaved Parity (e.g. SONET BIP-8 for path error monitoring)
- BIPV - Bit Interleaved Parity Violation
- BIS - Border Intermediate System (ATM Forum, PNNI SWG)
- B-ISDN - Broadband Integrated Services Digital Network
- B-HLI - Broadband High Layer Information
- B-ICI - Broadband Intercarrier Interface
- B-ISSI - Broadband Inter-Switching System Interface
- B-LLI - Broadband Low Layer Information
- BOM - Begining of Message
- BSS - Broadband Switching System
- BUS - Broadcast and Unknown Server
- C
- CAC - Connection Admission Control
- CBR - Constant Bit Rate
- CCITT (ITU) - Consultative Committee on International Telephony and Telegraphy
- CDV - Cell Delay Variation
- CDVT - Cell Delay Variation Time
- CE - Customer Equipment
- CEI - Connection Endpoint Identifier (UNI 3.0)
- CES - Circuit Emulation Service
- CIR - Committed Information Rate
- CLP - Cell Loss Priority
- CLR - Cell Loss Ratio
- CMISE - Common Management Information Service Element
- CNR - Complex Node Representation (ATM Forum, PNNI SWG)
- CPCS - Common Part Convergence Sublayer
- CPE - Customer Premise Equipment
- CPI - Common Part Indicator
- CR-LDP - Constrained Routing Label Distribution Protocol
- CRF(VC) - Virtual Channel Connection Related Function (related to UPC/UNI 3.0)
- CRS - Cell Relay Service
- CS - Convergence Sublayer (as in CS_PDU)
- CTD - Cell Transfer Delay
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