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Switch Fabric Front Module
Plexus 9000 Planning and Engineering Guide
Issue 2, April 23, 2004
Section 130-120-300
5-96
5.7.3 Theory
of
Operation
provides a simplified block diagram of the SF, which is
described in the following paragraphs.
Switch Fabric-Protection
BITS
Clocking
SIPO
SIPO
SIPO
ACE
ACE
ACE
To
IOMs
From
IOMs
Switch Fabric-Working
PCI Bus
P221-AA
06-12-00
BITS
Clocking
SIPO
SIPO
SIPO
APC
SAR
SYCOR
ACE
ASX
ASX
ASX
ASX
ASX
ASX
ASX
ASX
PISO
PISO
PISO
Figure 5.7-2. Block Diagram of the Switch Fabric Module
5.7.3.1 Power
The front SW/FAB module has its own DC-to-DC converter, which
converts the 48 volts supplied from the backplane to the local voltages
required (5V, 3V, etc.). The front module also provides these voltages to
the rear SW/FAB module.
5.7.3.2
Clocks and Synchronization
The ATM SF, maintenance link, and line interfaces all operate
synchronously to the BITS timing from the SP/TMG module.