363-206-295
Administration and Provisioning
Issue 1 December 1997 8-21
OC-12 Ring Network Cross-Connection Example 8
The following paragraphs describe a ring network example configuration and
describe how to create manual cross-connections to establish the ring network.
The example configuration is a ring network with two ring fibers and six nodes.
Ring 1 carries ring traffic in the clockwise direction while Ring 2 carries ring traffic
in the counterclockwise direction. For the purposes of this example, it is assumed
that each shelf has recently been installed, equipped with 23G/23G-U or 23H/
23H-U OLIUs in the main-B1 and main-B2 slots and 3DS3s in the function unit
slots, and all shelves are properly installed and provisioned. This example is for
DS3 services. See "System Turnup/Circuit Order" in the TOP section of this
manual (Volume II). Figure 8-1 shows the six nodes with dashed lines, indicating
the cross-connections.
Ring configurations support manual STS-1 cross-connections. Manual cross-
connections must be made at each node in the network for each circuit being
established. Drop cross-connections are made at the drop nodes where service
enters or exits the node (Nodes 1 and 5), and pass-through cross-connections are
made at each intermediate node (Nodes 2, 3, 4, and 6).
The example is for DS3 services but can be used for STS-1 services if the
function units are properly equipped with 3STS1E circuit packs. The 3STS1E
circuit pack can support three STS-1 cross-connections.
Pass-through cross-connections may be established first to minimize alarms. The
example assumes that the drop cross-connections are made shortly after the
pass-through cross-connections are made. This is the preferred method, since it
assures that all cross-connections are associated with services.
An alternate method is also possible. Before service is established, all shelves
can be defaulted to set up all pass-through cross-connections in the ring. This
method has the advantage of only having to delete pass-through and establish
drop cross-connections at the add/drop nodes. However, this method may
introduce the possibility of affecting service when cross-connections are deleted.
This is because it will not be possible to distinguish between pass-through cross-
connections that are in use carrying service from those that are available. Use of
this default pass-through provisioning method is only recommended if the
accuracy of the cross-connection information on the work order is assured.
The following commands may be used to delete, enter, and retrieve cross-
connections: dlt-crs-sts3c, ent-crs-sts3c, rtrv-crs-sts3c, dlt-
crs-sts1, ent-crs-sts1, and rtrv-crs-sts1. See Section 11,
"Commands and Reports," for a description of these commands.
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