The VLF Main circuit packs (LNW59, LNW82, and LNW504), allow true 0x1 unprotected operation for circuit packs. That means that tributary circuit packs can function unprotected and any slot can be equipped with any pack (some restrictions apply). Two unprotected circuit packs of the same type can also populate adjacent slots in the same group (this includes some Ethernet packs). For detailed information on circuit pack/slot equipage restrictions in 0x1 mode, see Very large fabric (VLF) engineering rules.
For OC-n ports, the 0x1 application is provisionable on a per-port basis. This allows packs with multiple ports to function in mixed modes with some ports running in a protected mode (UPSR, BLSR, 1+1), while others can be 0x1 unprotected.
In order for an OC-n pack to be unprotected, allowing 2 packs of the same kind to populate adjacent slots as stated above, all ports on the pack must be provisioned for 0x1.
When unprotected, all provisioning, reporting and retrieval (of alarms) associated with the pack, ports and tributaries in Slot 1 are independent of the provisioning, reporting and retrieval associated with the pack, ports and tributaries in Slot 2.
When provisioned for 0x1 operation, the affect on service and severity of alarms issued against a pack in Slot 1 of a particular group are independent from the affect on service and the severity of the alarms issued against the pack in Slot 2 of that group.
The following protection switching priorities on equipment are user-controllable through TL1 commands:
If protection is not desired, interfaces can be provisioned for no protection by not equipping the adjacent Function Unit slot.
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