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BCM5690_

A Scalable Approach to Gigabit Ethernet

Broadcom Corporation 

White Paper

06/27/02

■ BCM567x/BCM569x

power that can be added. These characteristics are most appropriate for wiring closets in enterprise organizations where

growth is expected or unpredictable. Each daisy chain-connected switch is typically built using BCM5670s with multiple

BCM5690s connected to them.

BCM5671

BCM5690 BCM5690

BCM5671

BCM5690 BCM5690

BCM5671

BCM5690 BCM5690

Figure 7: A Daisy Chain Interconnect

Table 2: Summary of System Interconnect Considerations

System

Candidate(s)

Performance

Comparative Cost Benefits

Simplex

Fixed, low-end Low

Low‘

Low-cost, simple

Duplex

Chassis

Low, but could

Low

boost with the

addition of a

BCM5680 in the

transmission path

Low-cost, simple, with path

redundancy for added

resiliency

Cascade

Fixed, low-end

Low

Low

Cost-effective

Matrix

Stackable,

Fixed, Chassis

High

High

Very high resiliency

Daisy

Chain

Stackable

High

Medium

Very scalable, nonblocking

Switch vendors have a variety of choices for an interconnect configuration, depending on the type of system being

built and the vendor’s priorities for performance, management, and cost.

Document 567x_569x-WP100-R

Broadcom Corporation

What to Build and How to Build It Page 11

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