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Selecting Test Features
Using Receive Overhead Monitor
If BYTE NAMES is chosen, the labels for the ALL COLUMNS overhead bytes
are displayed.
4 If POH (Path Overhead) is chosen, choose the source of the overhead VC-4, VC-
3, VC-2, VC-12 or VC-11.
J1 and J2 bytes can be monitored under Path Overhead or Trace Messages
5 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.
6 If LABELS is chosen, the S1 sync status, HP path label (C2) and the LP Path label
(V5) are monitored.
7 If APS MESSAGES is chosen, choose the TOPOLOGY,
TIP:
If any abnormal behavior is observed on a particular path or section overhead byte,
or an associated group of bytes (3XA1,3XA2; D1 - D3), the
TEST FUNCTION
on the suspect byte or bytes on a frame by frame basis. See "Using Receive
Overhead Capture " page 62.
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(G.841). The K1 and K2 bits are monitored.
RING
display of
OVERHEAD CAPTURE
(G.783) or
LINEAR
RECEIVE
can be used to "Zoom" in
57
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