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DESCRIPTION

The PM7326 S/UNI APEX is a full duplex ATM traffic management device, providing cell switching, per VC queuing, traffic shaping, congestion management, and hierarchical scheduling to up to 2048 loop ports and up to 4 WAN ports.

The S/UNI APEX provides per-VC queuing for 64K VCs. A per-VC queue may be allocated to any Class of Service (COS), within any port, in either direction (ingress or egress path). Per-VC queuing enables PCR or SCR per-VC shaping on WAN ports and greater fairness of bandwidth allocation between VCs within a COS.

FEATURES

? Monolithic single chip ATM traffic manager providing VC queuing/shaping and VC, Class Of Service(COS), and Port scheduling, congestion management, and switching across 2048 ports.

? Targeted at systems where many low speed ATM data ports are multiplexed onto few high speed ports.

? 869 Kcells/s non shaped throughput in full duplex.

? 1.73 Mcells/s non shaped throughput in half duplex.

? 1.42 Mcells/s shaped throughput (aggregate of the four shapers)

? Supports four WAN uplink ports, with port aliasing

? Supports 2048 loop ports. Loop port can support an uncongested rate up to 230Kcells/sec.

? Provides 4 Classes of Service per port with configurable traffic parameters enabling support for a mix of CBR, VBR, GFR, and UBR classes.

? Provides 64k per-VC queues individually assignable to any COS in any port.

? Provides support of up to 256k cells of shared buffer

? Provides 2 independent cell emission schedulers, 1 for the WAN ports, and 1 for the Loop ports. The schedulers have the following features: Three level hierarchical cell emission scheduling at the port, class, and VC levels.

? WAN Port Scheduling

? Weighted Interleaved Round Robin WAN port scheduling.

? Per port Priority Fair Queued class scheduling with port independence.

? Per Class

? Weighted Fair Queued VC scheduling with class independence or

? Shaped Fair Queued VC scheduling applying rate based per VC shaping or

? Frame Continuous Queued VC scheduling for VC Merge and packet re-assembly.

? Loop Port Scheduling

? Weighted Interleaved Round Robin Loop port scheduling.

? Per port Priority Fair Queued class scheduling with port independence.

? Per Class

? Weighted Fair Queued VC scheduling with class independence or

? Frame Continuous Queued scheduling for VC Merge and packet re-assembly

? Congestion Control applied per-VC, per-class, per-port and per-direction.

? Flexible, progressive hierarchical throttling of buffer consumption. Provides sharing of resources during low congestion, memory reservation during high congestion.

? Applies EPD and PPD on a per-VC, per-class, per-port, and per-direction basis with CLP differentiation, following emerging GFR standards.

? Provides EFCI marking on a per VC basis.

? Provides interrupts and indication of most recent VC/Class/Port that exceeded maximum thresholds.

APPLICATIONS

? DSL Access Multiplexers

? ATM Switches

? Multiservice Access Multiplexers

? 3rd generation wireless base stations and base station controllers

? OC-12 ingress congestion and traffic management

? OC-12 egress traffic manager and shaper