363-206-285
Administration and Provisioning
Issue 3 June 2001
8-53
OC-3/OC-12 Ring Network Drop and Continue
Cross-Connection Example 8
Figure 8-5 shows a DRI network.
1. The user wants to provision a fully protected service using drop and
continue cross-connections in this dual ring topology. The service is a DS3
at RT2 (bottom node in figure) to CO 4 (top node in figure).
2. All nodes in both rings require 22-type or 24-type OLIUs in the main slots
and all nodes require the same release of drop and continue ring software.
The two terminating nodes (CO 4 and RT2) require low-speed DS3 circuit
packs in a function unit as defined by the work order.
3. The site CO 1 has two NEs, one is part of the upper ring subnetwork and
the other is a part of the lower subnetwork. They are connected by EC-1
signals provided by STS1E low-speed circuit packs. The figure shows
these connections in function unit B of both NEs but any available function
unit can be used.
4. Note in the figure the identification of Ring 1 (clockwise) and Ring 2
(counterclockwise). This identification is a key to correct provisioning and
needs to be checked before cross-connections are made.
5. The work order will specify the low-speed channel of the DS3 service, the
available high-speed channel on the lower ring, and the low-speed channel
assigned at the drop and continue nodes. While it is not required by
DDM-2000 that the low-speed channel of the drop and continue nodes be
the same, it is recommended to simplify record keeping.
6. For this example, the cross-connections are:
ent-crs-sts1:b,m-1 at RT2 (two-way drop)
ent-crs-sts1:m-1,m-1 at RT3 and RT1 (pass-through)
ent-crs-sts1:m-1,b:cct=dc,ring=m1 at CO 1 (lower NE)
ent-crs-sts1:m-1,b:cct=dc,ring=m2 at CO 2 (lower NE).
The continued signal at CO 1 must be assigned to Ring 1 ("m1"), and the
continued signal at CO 2 must be assigned to Ring 2 ("m2").
7. In a similar manner, the upper ring is provisioned according to the work
order. The high-speed and low-speed addresses do not have to be the
same as the ones used in the lower ring, but they must follow the rules for
rings, which is to assign a single high-speed channel to all nodes for this
DS3 service.
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