10.2.9 Tributary Scan
This function requires VC12 or VT-1.5 mapping and allows you to quickly check the signal structure, trace identifier
and the payload.
Tributary Scan
An important part of any Add Drop Multiplexer (ADM) installation process is the verification of the path routing.
Considering that an STS-3 contains 84 x VT-1.5’s and a STS-12 contains 336 x VT-1.5’s checking each path
manually can be very time consuming.
The test set automatically performs a sequential BER test on each SONET tributary (VT channel) - mapping can be
via STS-N. The unit checks for any alarms in the received signal, the SONET structure, and for synchronization of the
selected test pattern in all channels. The result for each channel is entered in a table:
K.L.M.: ITU-T Tributary numbering scheme
Report: Pass (OK)
J2 trace: Corresponds to the VT trace being transmitted
Label: Corresponds to the V5 byte signal label being transmitted
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