Routing For Tandem Networks - Nortel ICS Install Manual

136 / Private networking using PRI SL-1
Received Destination
Node B to Node F
(continued)

Routing for tandem networks

In tandem networks each node needs to know how to route
calls that do not terminate locally. To do this, you set up routes
for each connecting node by defining destination codes for
each route.
If the node is also connected to the public network, the usual
routing is required for that connection.
The following examples show the routing tables for Node A
and Node C for externally-terminating calls.
Note: The PRI lines are enbloc lines, so all dialed digits are
collected before being dialed out.
Node A Destination Code Table, external termination
Route
4 (PSTN)
3 (Node B)
3 (Node B)
4 (PSTN)
4 (PSTN)
4 (PSTN)
4 (PSTN)
* This wild card represents a digit between 1 and 9.
Modular ICS 7.1 Installer Guide
Description
Node D receives it and identifies it as being for F.
Uses the private trunk to route call to F.
Incoming interface: Intercom
Destination: Remote node
Node F receives the call and identifies it as
terminating locally. Uses target line to route call.
Incoming interface: Private
Destination: Local (target line)
Absorb length
1
0
0
1
1
1
1
Destination code (public DNs)
91604
91403762 (Node B)
91403765 (Node E)
9140376* (not internal network)
914037* (not internal network)
91403* (not internal network)
9* (not internal network)
N0130943 02