Terminating Resistors On Bri-St Cards - Nortel ICS Install Manual

240 / Inserting a cartridge
1. Install trunk cartridges in the ICS beginning with Slot 4
then Slot 3.
2. Install trunk cartridges in the trunk modules beginning
with Slot 1 then Slot 2 and then Slot 3.
For easier wiring, install similar type Trunk Cartridges
together in the same Trunk Module.
If you install an E&M or a DID or BRI Trunk Cartridge in the
left-most slot (slot 1) of a TM, emergency telephones cannot
be supported for that Trunk Module.

Terminating resistors on BRI-ST Cards

The standard ISDN user-network interface wiring requires
terminating resistors at each end of the loop for point-to-point
operation. This ensures correct timing of the signaling circuits.
Loop termination can be provided at either the point where the
ISDN terminal is attached, or by the device attached to the
loop which has built-in termination. Because the Modular ICS
is usually at one end of the loop, the BRI-ST card is shipped
with termination built-in for each ISDN loop. It is ready to be
used where the ICS is located at one end of the loop, as in the
following illustration:
ICS
Modular ICS 7.1 Installer Guide
Built-in termination installed
TE connections without termination
TE with
termination
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