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Communication
Methods
The router communicates with the remote device
by using the K1 and K2 bytes in the line overhead of the SONET/SDH
frame. The values of these bytes determine the switching and protect
actions. Table 8 and Table 9 list the meanings of the values of the K1 and K2 bytes. The
bytes are defined in Telcordia document GR-253—Synchronous Optical
Network (SONET) Transport Systems: Common Generic Criteria, Revision
3 (September 2000). See requirement objects R5-56 [179] and R5-58
[181] for information about bit ordering and meaning for the K1 byte;
see R5-67 [190v2] for information about the K2 byte.
Table 8: Explanation
of K1 Byte
|
Bit Value (12345678)
|
Meaning
|
|
Bits 1–4 represent a request.
|
|
0000
|
No request
|
|
0001
|
Do not revert
|
|
0010
|
Reverse request
|
|
0011
|
Not used
|
|
0100
|
Exercise
|
|
0101
|
Not used
|
|
0110
|
Wait-to-restore
|
|
0111
|
Not used
|
|
1000
|
Manual switch
|
|
1001
|
Not used
|
|
1010
|
Low-priority signal degradation
|
|
1011
|
High-priority signal degradation
|
|
1100
|
Low-priority signal failure
|
|
1101
|
High-priority signal failure
|
|
1110
|
Forced switch
|
|
1111
|
Lockout of protection
|
|
Bits 5–8 represent the channel number.
|
|
0
|
Channel number of protect interface
|
|
0001–1110
|
Channel number of working interface
|
Table 9: Explanation
of K2 Byte
|
Bit Value (12345678)
|
Meaning
|
|
Bits 1–4 represent the channel number.
|
|
|
0
|
Channel number of protect interface
|
|
0001–1110
|
Channel number of working interface
|
|
Bit 5 indicates the type of redundancy.
|
|
0
|
1+1 architecture
|
|
Bits 6–8 indicate the switching mode.
|
|
000– 011
|
Reserved for future use
|
|
100
|
Unidirectional mode
|
|
101
|
Bidirectional mode
|
|
110
|
Line remote defect indication (RDI)
|
|
111
|
Line alarm indication signal (AIS)
|
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