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DS3 I/O Rear Module
Plexus 9000 Planning and Engineering Guide
Issue 3, April 23, 2004
Section 130-120-5500
5-144
Telica,
Inc
In the 85-3003 or 85-3004 chassis, physical slot 5 (I/O-5) and slot 17
(I/O-13) are the DS-3 protection module slots and slot 7 (I/O-7) is the
recommended DS1 protection slot. I/O-5 protects I/O-1 to 4 and 6 to 8;
I/O-13 protects I/O-9 to 12 and 14 to 17. I/O-7 when used for DS-1
protection provides protection for DS-1 IOMs in any slot. As in the 85-
3000 chassis, the system can be equipped with 17 interface modules with
no protection.
The rear DS-3 IOM has:
•
An EEPROM that contains the CLEI code
•
Six BNC connectors, three for the T3/STS-1 transmit channels and
three for the receive channels
•
Relays that pass the DS-3s/STS-1s to the front module or to the
protection bus
5.12.2.1
General Mechanical Representation
The rear module has six BNC connectors, Channels 1, 2 and 3 RX (IN)
and Channels 1, 2, and 3 TX (OUT) as shown in