AAC / CellSMART Enhanced Traffic Shaping Cell Protocol Module

General
Interface types	ATM UNI (for network or user ports)
Mates with these PLMs	OC-3c/STM1 SM OC-3c/STM1 MM DS3 E3 J2 Octal IMA DS1 Octal IMA E1
Processing capacity	ATM UNI: <= 155 Mbps
Service categories	CBR, RT-VBR, nrt-VBR, UBR+, and UBR.

Connections
Number of virtual connections	Up to 256 VPC or 1023 VCCs or combinations of up to 1023 connections plus up to 95 VPLs.

Traffic and Congestion Management
Cell emission scheduling	Per VC for all connections. nrt-VBR and UBR+ connections scheduled by a WFQ mechanism based on SCR or MCR.
General	Traffic shaping on a per-VC basis for all VBR connections. CBR not subject to congestion. Congestion management algorithm with partial and early packet discard.
Input queuing	Non-blocking input queue for CBR and rt-VBR, Separate non-blocking input queue for nrt-VBR, UBR+, and UBR.
Maximum CDV (CBR only)	Equals one emission time of the corresponding connection/port (e.g., 10 micro seconds for a 45 Mbps connection/port). For connections of at least 768 Kbps, the maximum CDV is 250 micro seconds. For connections below 768 Kbps, the CDV increases up to a maximum of 2300 micro seconds at 64 Kbps.
Output queuing	Total queue depth 128, 000 cells, allocated per VCC and VPC.
Output shaping	PCR for CBR, UBR, rt-VBR, and nrt-VBR connections. PCR and MCR for UBR+ connections.

Statistics Collection
Statistics collected per port	Valid real-time cells received Valid non-real-time cells received Unassigned cells received HEC errored cells received Invalid cells received Real-time cells transmitted Non-real-time cells transmitted CBR/rt-VBR cells discarded due to queue congestion/overflow nrt-VBR cells discarded due to queue congestion/overflow UBR+/UBR cells discarded due to queue congestion/overflow

Statistics Collection

Statistics collected per port

Valid real-time cells received

Valid non-real-time cells received

Unassigned cells received

HEC errored cells received

Invalid cells received

Real-time cells transmitted

Non-real-time cells transmitted

CBR/rt-VBR cells discarded due to queue congestion/overflow

nrt-VBR cells discarded due to queue congestion/overflow

UBR+/UBR cells discarded due to queue congestion/overflow

Standards Compliance
Meets applicable requirements of the following standards/generic requirements	ATM Forum UNI Version 3.0, September 1993, "User-Network Interface Specification" ATM Forum UNI Version 3.1, September 1994, "User-NEtwork Interface Specification" ATM Forum Traffic Management 4.0, April 1996 Bellcore GR-2848-CORE, June 1994, "Broadband Multi-service User-Network Interface Generic Requirements" Bellcore GR-1113-CORE, July 1994, "Asynchronous Transfer Mode (ATM) and ATM Adaptation Layer (AAL) Protocols Generic Requirements" Bellcore GR-2842-CORE, November 1994, "ATM Service Access Multiplexer (SAM) Generic Requirements" Bellcore TA-NWT-001110, August 1992, "Broadband ISDN Switching System Generic Requirements ITU-T Recommendation 1.413, "Broadband ISDN User-Network Interface" ITU-T Recommendation 1.311, "Broadband ISDN General Aspects" ITU-T Recommendation 1.150, "Asynchronous Transfer Mode Functional Characteristic" ITU-T Recommendation 1.361, "Broadband ISDN ATM Layer Specification" ITU-T Recommendation 1.363, "Broadband ISDN Adapation Layer Specification" ITU-T Recommendation 1.371, "Traffic Control and Congestion Control in B-ISDN"

Standards Compliance

Meets applicable requirements of the following standards/generic requirements

ATM Forum UNI Version 3.0, September 1993, "User-Network Interface Specification"

ATM Forum UNI Version 3.1, September 1994, "User-NEtwork Interface Specification"

ATM Forum Traffic Management 4.0, April 1996

Bellcore GR-2848-CORE, June 1994, "Broadband Multi-service User-Network Interface Generic Requirements"

Bellcore GR-1113-CORE, July 1994, "Asynchronous Transfer Mode (ATM) and ATM Adaptation Layer (AAL) Protocols Generic Requirements"

Bellcore GR-2842-CORE, November 1994, "ATM Service Access Multiplexer (SAM) Generic Requirements"

Bellcore TA-NWT-001110, August 1992, "Broadband ISDN Switching System Generic Requirements

ITU-T Recommendation 1.413, "Broadband ISDN User-Network Interface"

ITU-T Recommendation 1.311, "Broadband ISDN General Aspects"

ITU-T Recommendation 1.150, "Asynchronous Transfer Mode Functional Characteristic"

ITU-T Recommendation 1.361, "Broadband ISDN ATM Layer Specification"

ITU-T Recommendation 1.363, "Broadband ISDN Adapation Layer Specification"

ITU-T Recommendation 1.371, "Traffic Control and Congestion Control in B-ISDN"

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