363-206-285
Administration and Provisioning
Issue 3 June 2001
8-61
In Figure 8-7, the example configuration is a ring network with two ring fibers and five
nodes. Ring 1 carries ring traffic in the clockwise direction while Ring 2 carries ring traffic in
the counterclockwise direction. In the example configuration, Node 1 is a DDM-2000 OC-3
shelf equipped with 27-type OLIU circuit packs in the main slots, MXRVOs in function unit
A, and DS1 or DS1PM circuit packs in the Low-Speed Group A slots. Nodes 2 through 5 are
DDM-2000 FiberReach Multiplexer wideband shelves with 26-type OLIU circuit packs in the
main slots and DS1 or DS1PM circuit packs in the low-speed Group A slots. All shelves are
properly installed and provisioned. This example is for DS1 services. See "System Turnup/
Circuit Order" in the TOP section (Volume II) for actual procedures.
Ring configurations support manual VT1.5 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 4) and pass-through cross-connections are made at each intermediate node (Nodes 2,
3, and 5).
It is recommended that pass-through cross-connections be entered first, as shown below,
to avoid transient alarms during provisioning.
The following commands may be used to delete, enter, and retrieve cross-connections:
dlt-crs-vt1, ent-crs-vt1 and rtrv-crs-vt1. See Chapter 11, "Commands and
Reports," for a description of these commands.
To establish the end-to-end DS1 circuit from Node 1 to Node 4, as shown in Figure 8-7,
enter a cross-connection at each node as follows:
1. Enter the following pass-through cross-connections at Nodes 2, 3, and 5:
ent-crs-vt1:m-1-2-3,m-1-2-3:cct=twoway;
2. Enter the following cross-connection to drop the VT1.5 channel from the OC-1 ring to
a DS1 interface at Node 1:
ent-crs-vt1:m-1-2-3,a-2-3:cct=twoway;
3. Enter the following cross-connection to drop the VT1.5 channel from the OC-1 ring to
a DS1 interface at Node 4, a DDM-2000 FiberReach Wideband shelf:
ent-crs-vt1:m-1-2-3,a-1-1:cct=twoway;
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