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Rack Installation
Issue 1 October 1998
3-9
How to wire the Rack to the PSTN and DEFINITY ECS
Introduction
The following procedure provides wiring information to
connect the mounted Rack via the backplane connectors
to the PSTN and to the digital ports on the DEFINITY
ECS. (see Tables 3-2, 3-3, 3-4 and 3-5 for pinouts and
wiring details)
Definitions
Twisted Pair: Two insulated copper wires twisted around
each other to reduce interference with other electrical
sources. Numbers refer to pin numbers on the 50 pin
female connector.
Tip wire: The negative conductor in a telephone cable
pair.
Ring wire: The positive conductor in a telephone cable
pair.
Port 1, Port 2: Connections from Switch Cards to
DEFINITY ECS digital port.
Note: Only Port 1 is used for Model 3100 Analog Switch
Cards. Port 2 (future use) is for Model 3200 ISDN Switch
Cards which extends two digital ports per card for a
maximum of 24 remote users per Rack.
Card: Identifies the Switch Cards in the Rack
(0 through 11)
Procedure
1. Wire the Rack to the DEFINITY ECS using two
50-pin female connectors. Use the tables provided in
this Chapter for specific twisted pair connections:
P106, (Cards 0-5) Table 3-2
P108, (Cards 6-11) Table 3-3
2. Wire the Rack to the PSTN using two 50-pin female
connectors. Use the tables provided in this Chapter
for specific twisted pair connections:
P105, (Cards 0-5) Table 3-4
P107, (Cards 6-11) Table 3-5