AAC / CellSMART Quad CBR/Packet Protocol Module
(2 packets/2 CBR ports; or 4 CBR ports)
- Specifications
- Ordering Information
- Support Information
- Datasheet
| General (Quad Packet/CBR) | |
| Interface types supported | Frame-based interfaces, user-selectable: Frame Relay UNI ATM DXI/FUNI /SMDS DXI SMDX Kentrox Cisco Interface (obssolete) HDLC frames (frame forwarding mode of operation) |
| Mates with these PLMs | Quad DSX-1 Quad E1 Tri V.35/EIA-530 & DSX-1/TRi V.35/EIA-530 & E1 Quad V.35/EIA-530 |
| Processing capacity | 2.048 Mbps per port |
| Services supported / modes of operation | SMDS over ATM via SMDS DXI or ATM DXI/FUNI (AAL3/4) Frame Relay over ATM (AAL5) Service or network interworking per VC via Frame Relay UNI ATM DXI/FUNI (AAL5 and AAL 3/4) HDLC Frame Forwarding (AAL5) |
| Connection (Quad Packet/CBR) | |
| Number of virtual connections per port | SMDS DXI Mode: 1 VC with MID multiplexing capability, all traffic routed to a connectionless server over an ATM UNI or to another port with an SMDS interfae (AAL3/4) HDLC Frame Forwarding Mode: 1 VC for all HDLC frames. All traffic routed to a single destination (channel extension) over an ATM UNI or to another HDLC port (AAL5) Frame Relay UNI: 512 VCCs or DLCIs (AAl5) ATM DXI: Maximum of 512 connections, of which up to 255 can be VPCs (AAL5 or AAL3/5) |
| Traffic and Congestion Management (Quad Packet/CBR) | |
| Cell emission scheduling for minimal CDV | Per input port |
| General | Congestion management algorithm with partial packet discard and early packet discard and 4 VBR priorities. |
| Input queuing | Non-blocking input queue. |
| maximum burst size / burst tolerance | 210 cells |
| Maximum CDV (CBR only) | 250 microseconds per port (no assurance per connection) |
| Output queuing | VBR output queue, with traffic and congestion management capability |
| Rate control | SCR MAR rate control for CLP0+1, per VC. |
| Reassembly | Up to 18 simultaneous reassembly buffers of packets up to 9232 octets in length. User-selectable increase in number of simultaneous reassemblies to 36 with MTU reduced to 4616 octets. |
| Statistics Collection (Quad Packet/CBR) | |
| Statistics collected per port | Number of valid cells (input and output) Number of cells discarded for SCR violation Number of cells discarded for congestion Number of cells discarded due to corrupted AAL3/4 payload Number of valid packets (input and output) Number of packets discarded for invalid address (DLCI or DFA) Number of discarded AAL5 CPCS_PDUs (CRC error after reassembly) Number of packets discarded due to reassembly time-outs Number of packets discarded due to unavailable reassembly buffer |
| Standards Compliance (Quad Packet/CBR) | |
| Meets applicable requirements of the following standard/generic requirements | ATM Forum Contribution 94-0149, "protocol Interface Specification for Implementation of SMDS over an ATM Public UNI, " March 1994 Bellcore TR_TSV-000772, "Generic Requirements in Support of Switched Multi-Megabit Data Service, " May 1991 ATM Forum Contribution, ATMF 94-0996, "Frame Relay/ATM PVC Service Interworking Implementation Agreement" Bellcore GR-1113-COR, "Asynchrnous Transfer Mode (ATM) and ATM Adaptation Layer (AAL) Protocols Generic Requirements, " July 1994 Bellcore GR-2842-CORE, "ATM Service Access Multiplexer (SAM) Generic Requirements, " November 1994 Bellcore TA-NWT-001110, "Broadband ISDN Switching System Generic Requirements, " August 1992. 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 Adaptation Layer Specification." ITU-T Recommendation 1.364, "Support of Broadband Connectionless Data Service on B-ISDN." ITU-T REcommendation 1.555, "Frame Relaying Bearer Service Interworking" ITU-T Recommendation 1.371, "Traffic Control and Congestion Control in B-ISDN." |
| General (CBR) | |
| Interface types supported | Serial constant bit rate |
| Processing capacity | 2.048 Mbps (4528.3 cells/second) per port |
| Services supported / modes of operation | CBR CES, structured or unstructed mode (AAL1) supports structured or unstructured interoperability between V.35 CBR and DSX-1 or E1 CBR |
| Connections (CBR) | |
| Number of virtual connections per port | One active connection at a time. |
| Traffic and Congestion Management (CBR) | |
| Cell emission scheduling for minimal CDV | Per connection (one connection per port) |
| General | No congestion management. Congestion may occur only due to misallocating bandwidth. This result in cell discard and an immediate alarm. |
| Input queueing | Non-blocking input queue |
| maximum CDV | 250 microseconds |
| Output queuing/reassembly | One reassembly output queue with user-controllable depth depth influences CDVT (higher depth = higher CDVT) Six cell reassembly latency (Latency is a one-time delay introduced at the activation of the connection). User-selectable queue depth of 12 to 21 cells in 3-cell steps. |
| Statistics Collection (CBR) | |
| Statistics collected per port | Number of received valid cells Number of cells discarded due to corrupted AAL1 header. Number of cells discarded or missing due to mis-sequencing (non-contiguous sequence number in contiguous cells) |
| Standards Compliance (CBR) | |
| Meets applicable requirements of the following standards/generic requirements | ATM Forum AF-SAA-0032 000, "Circuit Emulation Service Interoperability Specification, " Une 1995. ATM Forum AF-VTOA-0078.000, "Circuit Emulation Service Interoperability Specification Version 2.0, " November 1996. Bellcore GR-1113-CORE, "Asynchornous Transfer Mode (ATM) and ATM Adaptation Layer (AAL) protocols Generic Requirements, " July 1994 Belcore GR2842-CORE, "ATM Service Access Multiplexer (SAM) Generic Requirements, " November 1994. Bellcore TA-NWT-001110, "Broadband ISDN Switching System Generic Requirements, " August 1992. ITU-T REcommendation 1.311, "Broadband ISDN General Aspects" ITU-T Recommendation 1.150, "Asynchronous Transfer Mode Functional Characteristc." ITU-T Recommendation 1.361, "Broadband ISDN ATM Layer Specification." ITU-T Recommendation 1.363.1, "Broadband ISDN Adaptation Layer Specification." ITU-T Recommendation 1.371, "Traffic Control and Congestion Control in B-ISDN." |