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Switch Fabric A/B Rear Modules
Plexus 9000 Planning and Engineering Guide
Issue 1, April 23, 2004
Section 130-120-350
5-108
Telica,
Inc
5.8.3.3 BITS
Interface
Both rear SFs have a T1 wire-wrap input for the BITS input. The BITS
input passes through lightning protection circuitry to a splitter that sends
the outputs to each of the front SP/TMG modules.
5.8.3.4
Bay Alarm Interface
The Bay Alarm Interface is not redundant and is located on the rear
SW/FAB-A module only. It provides two signals, Common and Bay
Lamp (normally open) to light the Bay Alarm lamp on the Power and
Alarm Panel when a critical alarm exists in the Plexus 9000.
5.8.3.5
Visual and Audible Alarm Interface
The Visual and Audible Alarm Interfaces also are not redundant and are
located on the rear SW/FAB- A module. Each interface has three
(3) Form C relays. The outputs of the Visual Alarm interface pass to the
Fan Shelf to light the Critical, Major and Minor alarm LEDs. They also
go to J2, the Alarm Contact connector. It is recommended that these
outputs be used for an external management/monitoring system. These
outputs cannot be cut off with the ACO (Alarm Cut Off) button located on
the front of the Fan Shelf.
The outputs of the Audible Alarm interface also pass to J2, the Alarm
Contact connector, for connection to audible alarming equipment. Refer
to
for the pin-out for this connector. These outputs can be cut
off and silenced with the ACO button on the front of the Fan Shelf or
using a TL1 command.
5.8.3.6 EEPROM
Both rear SW/FAB modules contain an EEPROM that contains the CLEI
code for the module.
5.8.3.7
Switch Fabric B Slot, Chassis ID Transition Module
This module is shipped installed in the chassis. It has only two active
components for the BITS input, so its MTBF is greater than the life of the
chassis. The SW/FAB B module also has an EEPROM that contains the
CLEI code and MAC address information for the chassis as well as chassis
parameters, such as the number of slots.