5-41/19/05 ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
ATM FCP Architecture
Beta Draft Confidential
ATM FCP Architecture
The ATM FCP provides per-VC queuing, and supports the CBX 500 quad-plane
buffer architecture. Figure 5-1 shows the ATM FCP output buffers relative to the
CBX 500 IOM quad-plane output buffers.
Figure 5-1. CBX 500 Queues and the ATM FCP
Cells from the CBX 500 switching fabric are transmitted through the ATM FCP to the
IOM output buffer. Note that the ATM FCP only manages non-real time traffic.
In the FCP, cells are queued and dequeued based on the configured rate for the VC.
Each VC is subject to discard mechanisms. Cells entering the output CBX 500
quad-plane queues are transmitted in the same manner as on an IOM that does not
have an FCP.
ATM FCP
Subsystem
RM Cell
Processor
CBX 500 I/O Module
VC #n
Per-VC Queuing
CBR
VBR-RT
VBR-NRT
ABR/UBR
Switching
Planes
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