Cisco BPX 8650, Installation And Configuration Manual

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Cisco BPX 8600 Series Installation and Configuration
Release 9.3.30, Part Number 78-12907-01 Rev. E0, May 2005
Chapter 3 BPX Switch Common Core Components
BPX Switch StrataBus 9.6 and 19.2 Gbps Backplanes
BPX Switch StrataBus 9.6 and 19.2 Gbps Backplanes
The BPX switch is equipped with a backplane that supports either a 9.6 or up to 19.2 Gbps operation.
The 19.2 Gbps backplane can physically be identified by the card slot fuses on the bottom rear of the
backplane. All BPX switch modules are interconnected by the BPX switch StrataBus backplane
physically located between the front card slots and the back card slots.
Although the ATM data paths between the switching fabric and the interface modules are individual data
connections, there are also a number of system bus paths for controlling the operation of the BPX switch.
The StrataBus backplane, in addition to the 15 card connectors, contains the following signal paths:
• ATM crosspoint wiring—Specifies the individual paths to carry ATM trunk data between both the
network interface and service interface modules and the crosspoint switching fabric.
•
Polling bus—Enables the signals between the BCC and all network interface modules.
•
Communications bus—Specifies the internal communications between the BCC and all other cards
in the node.
•
Clock bus—Carries the timing signals between the BCC and all other system cards.
• Control bus—Enables either the A-bus wiring or B-bus wiring.
All StrataBus wiring is completely duplicated and the two sets of bus wiring operate independently to
provide complete redundancy. Either the A-side wiring or B-side wiring is enabled at any particular time
by signals on the Control bus.