Lucent Technologies DDM-2000 OC-3, User & Service Manual

Page: 483 / 2536

363-206-285
Administration and Provisioning
Issue 3 June 2001 8-43
pass-through cross-connections. In this case, use the
rtrv-map-netwrk
command to identify the TIDs for all the NEs in a ring.
OC-3 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 22-type OLIUs in the
main 1 and main 2 slots, MXRVOs in the function unit slots, and DS1s in the Low-
Speed Group slot; and all shelves are properly installed and provisioned. This
example is for DS1 services. DS3 and EC-1 low-speed services can follow an
equivalent procedure. See "System Turnup/Circuit Order," in the TOP section of
this manual (Volume II). Figure 8-3 shows the six nodes with dashed lines
indicating the cross-connections.
Ring configurations support manual VT1.5 or 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 DS1 services but can be used to STS-1 services if the function
units are properly equipped with DS3 and or STS1E circuit packs. The STS1E
circuit pack can support 28 VT cross-connections or one STS-1 cross-connection.
Pass-through cross-connections should be established first to minimize alarms.
The example assumes that the drop cross-connections are made 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-vt1
,
ent-crs-vt1
,
rtrv-crs-vt1
,
dlt-crs-sts1
,
ent-crs-sts1
, and
rtrv-crs-sts1
. See Section 11, "Commands and
Reports," for a description of these commands.