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Selecting Test Features
Using Receive Overhead Monitor
Using Receive Overhead Monitor
Description When first connecting to a SONET network, a start up confidence check
can be made by viewing the behavior of all the overhead bytes. If the
SONET network shows alarm indications, some diagnosis of the problem
may be gained from viewing all the overhead bytes.The OVERHEAD
MONITOR display is updated once per second (once per 8000 frames)
approximately.
HOW TO: 1 Set up the receive SONET interface and payload as required.
2 Choose the type of overhead to MONITOR.
If TRACE MESSAGES is chosen, you can monitor a data message to
verify portions of the network.
If the 16 byte CRC7 message structure is detected, the 15 characters
within the message are displayed.
If the CRC7 structure is not detected in J1, the 64 byte message
format is assumed and displayed. If the CRC7 structure is not detected
for J0 or J2, all 16 bytes are displayed.
3 If TOH (Transport Overhead) is chosen, choose the format to be
displayed from the STS-1# field.
Bytes shown unlabeled have not yet been defined.
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