When using the OC-n OLIU in M1 and M2, for VT add/drop cross-connections, VT hairpin cross-connections, and VT pass through cross-connection, restrictions apply.
Important!
The restrictions do not apply to the LNW27, LNW29, LNW32, LNW76, LNW202, LNW221-255, LNW502 or the VLF circuit packs.
The VT fabric on the main OC-12/48 OLIU circuit packs (M1 and M2) supports several types of VT cross-connections.
The total provisionable bidirectional VT cross-connect capacity of 336 VT1.5s is shared among the four types of VT cross-connections.
Important!
The "dual tatrib" modes (MONEF and SPLTEF) of VT test access are not possible when the system is equipped with small/medium VT fabric Main OLIUs. For more information see the VT1.5 test access matrix.
The user can not provision a VT1.5 connection whose source STS is the same as the destination STS of another VT1.5 connection. Source and destination are not a function of the src_aid and dest_aid in the ENT-CRS-rr command. Rather source and destination are determined based on the relative STS number. The lower STS number is designated as the source and the higher STS number is designated as the destination based on the following ordering of the slots, main < fna < fnb < fnc < fnd < growth.
The one exception to this rule is for cross-connections to DS1 ports on the LNW7 packs. For these connections the OC-N port is always the source and the DS1 port is always the destination. The following example illustrates the restriction. The commands are not syntactically correct. They are intended only to show the aids.
The ENT-CRS-VT1 command uses the following aid format for the src_aid and dest_aid parameters. {group}-{line}-{STS}-{VTG}-{VT1.5}.
Step 1:
Ent-crs-vt1:b-1-1-1-1,a-1-1-1-1 cross-connects a VT1.5 in FN Group A to a VT1.5 in Function Group B. According to the rule defined above, the lower STS channel (a-1-1) is designated the source and the higher STS channel (b-1-1) is designated the destination.
Step 2:
Ent-crs-vt1:b-1-1-1-2,c-1-1-1-2 cross-connects a VT1.5 in FN Group B to a VT1.5 in Function Group C.
In the above example, the cross-connection in step 2 (b-1-1-1-1 to c-1-1-1-2) would be denied because the source STS (b-1-1) is the same as the destination STS channel (b-1-1) in the cross-connect established in step 1 (b-1-1-1-1 to a-1-1-1-1).
If the Main slots are equipped with OC-12 OLIU (LNW48, LNW50, LNW54, LNW203) circuit packs provisioned to support VT1.5 signals in up to 12 STS-1 signals, VT pass-through cross-connections on the Main circuit packs can in some cases conflict with VT add/drop cross-connections and VT hairpin cross-connections. This restriction, however, cannot be characterized by a set of rules. Requests to establish a VT cross-connection that would result in a conflict between a VT pass-through cross-connection on the main and a VT add/drop or VT hairpin cross-connection are denied.
| November 2011 | Copyright © 2011 Alcatel-Lucent. All rights reserved. |