Nortel Networks 3500 User Manual

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

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

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

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.

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

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

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

— Provisioning rules #

 and #

 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.

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.