Nortel Networks 3500, NTRN10AN manual Traffic flow over OC-48 Blsr, Blsr connection audit

Operation, administration, and maintenance (OAM) features 2-31

BLSR connection audit

If there is a discrepancy discovered in the connection audit, the "BLSR Connection Audit Failed" alarm is raised against the pass-through node with the inconsistency.

BLSR connection audit behaviour is as follows:

•The BLSR connection audit feature resides on the NPx.

•The audit period is user-provisionable.

•If the audit cannot connect to a node’s SPx, the NPx will output the autonomous message "BLSR Connection Audit could not connect to SP"

•The audit will determine the correct End NE A and End NE Z information of a path by looking at the Add/Drop points of the existing path.

•When an audit is complete, the NPx will output the autonomous message "BLSR Connection Audit completed".

•The "BLSR Connection Audit Failed" alarm is cleared upon the next successful BLSR connection audit.

•The BLSR connection audit feature can only raise an alarm if the entire path is provisioned. For partial paths (for example, during the provisioning of a path), an alarm is not raised.

Traffic flow over OC-48 BLSR

All traffic types previously supported on the OPTera Metro 3500 shelf are supported in Release 12.1.

OC-48 BLSR is supported on OPTera Metro 3500 shelves equipped with VTX-series circuit packs in slots 13 and 14.

STS BLSR with VT assignment

In VT assigned BLSRs, users must provision STS connections at pass-through nodes. This gives a number of distinct advantages to the user:

•There are fewer connections for the user to manage.

•There are fewer, therefore quicker, connection retrievals on pass-through nodes.

Note: The number of fewer connections can be estimated to be:

16 nodes x 24 available STS/node x 1/2 used for passthrough x 28 VT/STS = 5376 fewer possible connections.

•The BLSR topology of OPTera Metro 3500 supports interoperability with STS-based products like OPTera Connect HDX, OPTera Connect DX and TransportNode OC-48 subtended BLSRs.

Planning and Ordering Guide—Part 1 of 2 NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004