Others Not used
K2 Byte (APS-Ring)
Conforms to and follows ITU-T G.841 Bellcore GR.253 recommendations
Used to activate and deactivate the switching between the main and protection paths on a multiplexer section
Used to communicate Alarm Indication Signal (AIS) and Remote Defect Indication (RDI) conditions
Bits 1-4 are the source node ID
Bit 5 is the path code
0 Short path
1 Long path
Bits 6-8
000 Idle
001 Bridged
010 Bridged and switched
110 RDI-L
111 AIS-L
Others Not used
K2 Byte (APS-Linear)
Data Communications Channel (DCC) Bytes (D4-D12)
Data Communications Channel (DCC) – together these nine bytes form a 576kbps message channel for OAM
purposes.
They can be used for internally or externally generated messages or BER function.
S1 Byte (Synchronization Status)
Synchronization status message byte contains information about the quality of the embedded timing and is used
to inform the remote Multiplexer of the clock quality used to generate signals.
Bits 1-4 carry synchronization messages
Bits 5-8
0000 Synchronized - Traceability Unknown
0001 Stratum 1
0100 Transit Node Clock
0111 Stratum 2
1010 Stratum 3
1100 SONET Minimum Clock
1101 Stratum 3e
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