Nortel BCM 3.7, Manual

Page: 530 / 1004

530 Creating tandem private networks
N0008589 3.3
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 tables show the routing tables for Node A and Node C for external and internal
terminating calls.
Note: The PRI lines are enbloc dialing lines, so all dialed digits are collected before being dialed
out.
Node B Node F User on B dials a private DN for node F.
DN type: Private
Node B identifies it as being for node A and uses private trunk to route the call to A.
Incoming interface: Intercom
Destination: Remote node
Node A receives it and identifies it as being for C. Uses IP trunk to route call to C.
Incoming interface: Intercom
Destination: Remote node
Node C receives it and identifies it as being for D. Uses the private trunk to route call to
D.
Incoming interface: Intercom
Destination: Remote node
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. (Private received #)
Incoming interface: Private
Destination: Local (target line)
Table 117 Node A destination code table, external termination
Route Absorb length Destination code (public DNs)
4 (PSTN) 1 91604
3 (Node B) 0 91403762 (Node B)
3 (Node B) 0 91403765 (Node E)
4 (PSTN) 1 9140376* (not internal network)
4 (PSTN) 1 914037* (not internal network)
4 (PSTN) 1 91403* (not internal network)
4 (PSTN) 1 9* (not internal network)
* This wild card represents a single digit.
Table 116 Calls originating from the private network within a tandem network (Continued)
Received Destination Description