VeEX RXT-6000e, User Manual

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1101 Stratum 3e
1110 Previsional by the Network Operator
1111 Not used for synchronization
Other bytes are reserved
S1 Byte (Synchronization Status)
Order Wire Byte (E2)
A 64kbps voice communication channel between multiplexers.
It’s a channel used by craft persons and will be ignored as it passes through regenerators.
The relief byte is used for ring protection
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Path Overhead Layer
The following is a partial list of POH bytes and their corresponding functions:
J1 byte (STS Path Trace)
High Order VC-N path trace byte
A unique message is assigned to each path in a SDH network – therefore the path trace can be used to
check continuity between any location on a transmission path and the path source
This user programmable byte repeatedly transmits a 15-byte string plus 1 (CRC-7) byte so that a receiver
can continually verify its connection with the transmitter
A 64-byte free-format string is also permitted
The message is transmitted one byte per VC-4 frame
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