89TSF500
Switch Fabric Data Sheet
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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:
Description
The 89TSF5xx is a complete switch fabric, consisting of two chips:
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89TSF552 (queuing engine, 10 Gbps).
89TSF500 (crossbar and scheduler).
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A maximum of 32 ports with 8 CoS, or
A maximum of 16 ports with 4 subports and 4 CoS.
The 89TSF5xx switch fabric is a system of one or more queueing
engines and one or more crossbar/schedulers. The main function of the
89TSF5xx is to route traffic from the source to the destination in a fair
and efficient way. It can be configured in many ways that achieve fair-
ness, balance loads, minimize traffic congestion, and protect against
failure. These devices interconnect using sets of high-speed SerDes
links. They are scalable, and bandwidth increases linearly when you add
multiple 89TSF500s. A functional block diagram of the 89TSF500 is
shown in Figure 1.
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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.
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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:
The 89TSF552 is the interface of a system port (usually equivalent to
a line card1) to the 89TSF5xx switch fabric. The 89TSF500 is the
“switch” of the 89TSF5xx switch fabric. Combined, they provide up to
10 Gbps switching bandwidth per system port and up to 32 system ports
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or 64 system subports2 per system.
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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.
The 89TSF5xx switch fabric devices interconnect using high speed,
serial links. The 89TSF5xx system can be implemented on a single shelf
or on multiple shelves. Figure 2 is an example of a single-shelf system,
while Figures 3 and 4 illustrate multiple-shelf systems.
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The 89TSF5xx switch fabric has a modular and scalable architecture
that gives system designers maximum flexibility and performance. This
architecture allows a switch to be implemented either on a single shelf
using an electrical backplane or on multiple shelves connected by
optical transceivers, thus helping system vendors overcome physical
space constraints.
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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.
The 89TSF500 consists of an integrated crossbar and a scheduler. It
has a non-blocking architecture and supports up to 8 classes of service
and spatial multicasting. It performs data switching and circuit switching
concurrently, providing guaranteed bandwidth and fixed jitter for the
circuit paths.
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Advanced diagnostic features including multiple loopback
paths.
Unicast and multicast traffic with up to 8 classes of service.
Industry-standard CSIX-over-LVDS interface.
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A single 89TSF500 has an aggregate bandwidth of 64 Gbps, full
duplex, providing the benefits of high density, low cost, and low power.
Multiple 89TSF500s can be combined to support system configurations
up to 32 line cards at 10 Gbps, full duplex.
Backward compatibility with IDT’s ZSF200 switch fabric.
89TSF500 Features
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32 embedded SerDes links per device at 2.5 Gbps per link.
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Linear scalability for higher aggregate port density.
Combined unicast and multicast scheduling.
Clock synchronization and cell alignment across the fabric.
External processor interface for register config. and status.
89TSF5xx Features
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Up to 32 switch ports, with 24 Gbps available per switch port.
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1.
A 10 Gbps line card would have a single 89TSF552 and therefore that line
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card would be equivalent to a system port. However, a 20 Gbps line card would
have two 89TSF552s and therefore that line card is equivalent to 2 system
ports.
2. One 89TSF552 can support up to 4 system subports.
IDT and the IDT logo are trademarks of Integrated Device Technology, Inc.
1 of 37
April 13, 2005
DSC 6798
© 2004 Integrated Device Technology, Inc.
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