Nortel Networks OPTera Metro 3500 - Manual (Page 184)

2-146 Operation, administration, and maintenance (OAM) features
OPTera Metro 3500 Multiservice Platform NTRN10AN Rel 12.1 Standard Iss 1 Apr 2004
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