363-206-295
Administration and Provisioning
8-36 Issue 1 December 1997
For dual homed applications, OLIUs must be installed in the proper slots at the
OC-12 nodes to support the traffic direction that is required. For example, in
Figure 8-6, a 21-type OLIU must be installed in Node 6 function unit b-2 allowing
DS1 traffic from Node 1 to be routed to Node 6 when the proper cross-
connections are made. At the DS1 drop point of the OC-3 ring, a 21-type OLIU
must be installed in function unit b-1 of the OC-3 drop shelf.
Example Cross-Connections 8
The OC-12 (STS level) cross-connections are:
■ At Node 4: mb-1:b-1
■ At Node 5: mb-1:b-1
■ At Node 6: mb-1:b-2
The OC-3 (VT level) cross-connections are:
■ At Node 1: b-2-1:m-1-2-1
■ At Node 7: m-2-2-1:b-2-1
For more examples of OC-3/OC12 dual homing cross-connections, see the TOP
(Volume II) section of this manual.
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