363-206-295
Administration and Provisioning
8-28 Issue 1 December 1997
OC-12 Ring Network Drop and Continue Cross-
Connection Example 8
Figure 8-3 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 require the same release of drop and continue ring software. The two
terminating nodes (CO 4 and RT2) require low-speed 3DS3 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
3STS1E low-speed circuit packs. The figure shows these connections in function
unit C 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:c-2,mb-7 at RT2 (twoway drop)
ent-crs-sts1:mb-7,mb-7 at RT3 and RT1 (pass-through)
ent-crs-sts1:mb-7,c-2:cct=dc,ring=mb1 at CO 1 (lower NE)
ent-crs-sts1:mb-7,c-2:cct=dc,ring=mb2 at CO 2 (lower NE).
The continued signal at CO 1 must be assigned to Ring 1 ("mb1") and the
continued signal at CO 2 must be assigned to Ring 2 ("mb2").
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. For this example, the
cross-connections are:
ent-crs-sts1:mb-7,c-2:cct=dc,ring=mb2 at CO 1 (upper NE)
ent-crs-sts1:mb-7,c-2:cct=dc,ring=mb1 at CO 2 (upper NE)
ent-crs-sts1:mb-7,mb-7 at CO 3 and CO 5 (pass-through)
ent-crs-sts1:c-2,mb-7 at CO 4 (two-way drop).
The continued signal at CO 1 must be assigned to Ring 2 ("mb2"), and the
continued signal at CO 2 must be assigned to Ring 1 ("mb1").
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