Nortel Networks NTRN10AN, 3500 manual Support for 12 DSM, Synchronization

2-146Operation, administration, and maintenance (OAM) features

Engineering rules

The following engineering rules apply to the STS-1 managed DSM feature:

•OPTera Metro 3500 shelves equipped with STX-192 circuit packs (in slots 13 and 14) only supports STS-1 managed DS1 facilities.

•OPTera Metro 3500 shelves equipped with VTX-series circuit packs (in slots 13 and 14) support both VT and STS-1 managed DS1 facilities.

•STS-Managed DS1 facilities do not support individual Connection IDs, instead the STS1 cross connection can be assigned a Connection ID.

•Site Manager will support:

—STS-managed circuits.

—VT managed circuits.

—mix of STS & VT managed circuits.

•STS-1 managed DSM provisioning data will survive:

—upgrades

—SPx replacement

—Save and Restore operations

•You can not provision an STS1 cross connect between DS3 circuit pack to an STS-1 managed DSM.

•You can not provision DS1 facilities on DS1 DSM to DS1 facilities on channelized DS3 circuit pack using a single STS1-level bandwidth management command. The channelized DS3 circuit packs is VT-managed which is not supported by the STS-managed STX-192 circuit pack.

Support for 12 DSM

OPTera Metro 3500 Release 12.0 and higher supports 12 protected or unprotected DSMs. The DSM units could be configured as:

•STS managed only (with STX-192 circuit pack in slots 13 and 14).

•STS managed only (with VTX-series circuit packs in slots 13 and 14).

•STS or VT Managed combination (with VTX-series circuit packs in slot 13 and 14).

•VT managed only (with VTX-series circuit packs in slots 13 and 14 only).

Synchronization

SONET-based equipment derives many of its basic attributes from synchronous operation. Synchronization is required in networks that contain

•add/drop multiplexers (ADMs)

•synchronous tributaries

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