Nortel Networks NTRN10AN, 3500 manual Provisioning rules, Risk of traffic loss

2-34Operation, administration, and maintenance (OAM) features

Provisioning rules

The following BLSR provisioning rules represent the sum of engineering rules - as enforced by system software - plus provisioning recommendations.

CAUTION

Risk of traffic loss

Blocking of provisioning is performed only at a nodal level. Channel reserving / blocking does not span more than one section. After using the provisioning rules to determine which channels are reserved / blocked on the east and west fiber sections adjacent to an add / drop node, users should ensure they respect these ‘reserved’ and ‘blocked’ time slot assignments in all downstream fiber sections until the far-end add / drop node. Provisioning over these time slot assignments downstream may result in dropped traffic if a protection switch occurs.

Table 2-4

OC-48/OC-192 BLSR provisioning rules

Rule # Description

1Only the working channels may be provisioned as non-RPR connections

Note 1: For OC-48 BLSR the working channels are any of the STS-1 #1 through #24.

Note 2: For OC-48 BLSR, STS-1 #25 through #48 are reserved for non-RPR protection and may not be provisioned as unprotected channels for non-RPR traffic.

Note 3: For OC-192 BLSR the working channels are any of the STS-1 #1 through #96.

Note 4: For OC-192 BLSR, STS-1 #97 through #192 are reserved for non-RPR protection and may not be provisioned as unprotected channels for non-RPR traffic

2RPR traffic may be provisioned on STS-1 #1 through #48 for OC-48 BLSR or STS-1 #1 through #192 for OC-192 BLSR

3Mixed scenarios (both RPR and non-RPR traffic sharing the same BLSR fiber span) may be provisioned.

—Provisioning rules #1 and #2 apply in mixed scenarios for their respective traffic types.

—If a working channel is provisioned for non-RPR traffic, its protection channel is committed to being protection and may not be used for RPR traffic.

—If a protection channel is provisioned for RPR traffic, its working channel may not be provisioned as a non-RPR connection.

—If an East working channel (any of STS-1 #1 through #24 for OC-48 BLSR or STS-1 #1 through #96 for OC-192 BLSR) is provisioned for RPR traffic, the West working channel with the same time slot assignment is reserved for RPR provisioning.

Note: The same is true if the West working channel is provisioned as an RPR connection before the East working channel.

4RPR connections on the East side of a ring must have the same signal rate as the RPR connection (on the same time slot assignment) on the West side of the same ring.

OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004