89TSF5xx Features

◆ Up to 32 switch ports, with 24 Gbps available per switch port.

◆ Variable length CSIX payload (up to 132 bytes) that supports

any type of traffic.

◆ Virtual output queues (VOQs) in the ingress direction that

eliminate head-of-line blocking. The 256 unicast VOQs

provide:

– A maximum of 32 ports with 8 CoS, or

– A maximum of 16 ports with 4 subports and 4 CoS.

◆ Spatial multicast support with up to 4K global multicast

labels. Each multicast label can specify from 1 to 32 ports.

◆ Efficient backpressure mechanism that eliminates cell loss

caused by congestion.

◆ In-service scalable architecture.

◆ “Stackable” architecture. Total aggregate bandwidth is

linearly proportional to the number of 89TSF500s. Port rate is

configurable up to OC-192.

◆ Always non-blocking architecture across destination, traffic

type (cell, packet), and class of service (CoS).

◆ Supports up to 4 egress subports per switch port.

◆ Carrier class reliability features:

– Flexible architecture that allows the 89TSF switch fabric to be

employed in a single switch shelf or in multiple switch shelves.

– Automatic link diagnostics that detect faulty link connections.

– Both n+m (load-sharing mode) and 1:1 protection (active/

standby mode) on serial links.

– Patented error correction scheme to reduce the system bit error

rate by 105.

– Line cord redundancy via Redundant Destination Mapping

(RDM) and Queue-Mapped Redundancy (QMR).

– Dynamic 89TSF500 rerouting that avoids congested or faulty

89TSF500s.

– Zero cell loss during controlled switchover to standby

89TSF500s.

◆ Advanced diagnostic features including multiple loopback

paths.

◆ Unicast and multicast traffic with up to 8 classes of service.

◆ Industry-standard CSIX-over-LVDS interface.

◆ Backward compatibility with IDT’s ZSF200 switch fabric.