31
Selecting Test Features
Using Receive Overhead Monitor
If STS-1#1,2,3 is chosen, the hexadecimal value of all 81 bytes of
transport overhead is displayed and can be set using
.
If BYTE NAMES is chosen, the labels for the STS-1#1,2,3 overhead
bytes is displayed.
4 If POH (Path Overhead) is chosen, choose the source of the overhead
SPE or VTSPE.
J1 and J2 bytes can be monitored under Path Overhead or Trace
Messages
5 If APS MESSAGES is chosen, choose the TOPOLOGY,
(G.253) or (G.1230). The K1 and K2 bits are monitored.
6 If LABELS is chosen, the S1 sync status and STS path label (C2) are
monitored.
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
display of can be
used to "Zoom" in on the suspect byte or bytes on a frame by frame basis.
See "Using Receive Overhead Capture " page 35.
DECREASE DIGIT INCREASE DIGIT
LINEAR
RING
RECEIVE
TEST FUNCTION
OVERHEAD CAPTURE
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