Port Features
Page 80 7750 SR Interface Configuration Guide
APS Channel and SONET Header K Bytes
The APS channel (bytes K1 and K2 in the SONET header) is used to exchange APS protocol
messages for all APS modes.
K1 Byte
The switch priority of a request is assigned as indicated by bits 1 through 4 of the K1 byte (as
described in the rfc3498 APS-MIB).
The channel requesting switch action is assigned by bits 5 through 8. When channel number 0 is
selected, the condition bits show the received protection channel status. When channel number 1 is
selected, the condition bits show the received working channel status. Channel values of 0 and 1
are supported.
Table 18: K1 Byte, Bits 1-4: Type of Request
Bit 1234 Condition
1111 Lockout of protection
1110 Force switch
1101 SF - High priority
1100 SF - Low priority
1011 SD - High priority
1010 SD - Low priority
1001 (not used)
1000 Manual switch
0111 (not used)
0110 Wait-to-restore
0101 (not used)
0100 Exercise
0011 (not used)
0010 Reverse request
0001 Do not revert
0000 No request
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