1+1 Msp Protection Switch Criteria - Nortel Optical Multiservice Edge 6130 Planning Manual

The working and protection ports of the 1+1 MSP traffic protection groups can
be provisioned on the same slot or on different slots for the STM-1 interfaces
of the 2x155M tributary circuit packs.
Example 1: Working and protection ports on same slot
The user can provision a 1+1 MSP traffic protection group with the STM-1
slot 4 port 1 as the working port and the STM-1 slot 4 port 2 as the
protection port.
Example 2: Working and protection ports on different slots
The user can provision a 1+1 MSP traffic protection group with the STM-1
slot 4 port 1 as the working port and the STM-1 slot 5 port 1 as the
protection port.
The user provisions the Protection switching mode as either 2WAY
(bidirectional where both transmit and receive directions switch together) or
1WAY (unidirectional where only the transmit or receive directions switched
based on the fault or user initiated action). The Admin reversion mode can be
set to either revertive or non-revertive. By default, the non-revertive mode is
set. When revertive mode is selected, the user must also specify the WTR
Time period for the MSP group.
The user provisions the Route Diversity for the 1+1 MSP traffic protection
group. The route diversity can be set to enable or disable for the STM-1/4 of
the 2x155/622M aggregate circuit pack. By default, the route diversity is set to
enable. The route diversity must be set to enable for the STM-1 of the 2x155
tributary circuit pack.
For detailed procedures for 1+1 MSP protection, refer to Provisioning and
Protection Switching Procedures, 323-1855-310.

1+1 MSP protection switch criteria

1+1 MSP protection switch request can occur automatically by the system or
by user initiated actions.
Note: User-initiated 1+1 MSP switching commands are signaled via MSP
channels (K1 and K2 bytes).
Table 6-7 summarizes the hierarchy of protection commands.
Table 6-7
1+1 MSP
protection - command hierarchy
Switch request
Lockout of protection
Auto switch (Signal Fail) on protection
Forced switch
Planning Guide NT6Q92MA Rel 1.0 Iss 1 Standard September 2006
OAM&P description 6-19
Priority
1 (highest)
2
3