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
Path Overhead Layer (POH)
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
J1 Byte (HP Path Trace)
B3 byte
Even code parity which determines if a transmission error has occurred over a path
Its value is calculated over all the bits of the previous VC-4
The computed checksum is placed in the B3 byte before scrambling
C2 byte (HP signal label) for SDH mode
Indicates mapping of the VC-n.
The table below indicates the standard C2 binary values:
C2 Byte (HP signal label)
RXT-3900 e-Manual D07-00-111P Rev A00
Summary of Contents for RXT3900
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