Nortel Networks OPTera Metro 3500 - Manual (Page 72)

2-34 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
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
1 Only 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
2 RPR traffic may be provisioned on STS-1 #1 through #48 for OC-48 BLSR or STS-1 #1 through
#192 for OC-192 BLSR
3 Mixed 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.
4 RPR 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.