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S1 Byte (Synchronization Status)
Order Wire Byte (E2)
A 64 kbps 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
Path Overhead Layer (POH)
The following is a partial list of POH bytes and their corresponding functions:
J1 byte (STS Path Trace)
High Order STS-N path trace byte
An unique message is assigned to each path in a SONET 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 STS-3 frame
J1 Byte (STS 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 STS-3
RXT-3900 e-Manual D07-00-111P Rev A00
Содержание RXT3900
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