Table 16: K1 Byte, Bits 1-4: Type Of Request - Alcatel-Lucent 7750 SR OS Interface Configuration Manual

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).

Table 16: K1 Byte, Bits 1-4: Type of Request

Bit 1234
1111
1110
1101
1100
1011
1010
1001
1000
0111
0110
0101
0100
0011
0010
0001
0000
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.
7750 SR OS Interface Configuration Guide
Condition
Lockout of protection
Force switch
SF - High priority
SF - Low priority
SD - High priority
SD - Low priority
(not used)
Manual switch
(not used)
Wait-to-restore
(not used)
Exercise
(not used)
Reverse request
Do not revert
No request
Interface Configuration
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