HP OMNIBER 718 HP 37718A - Manual (Page 32)

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Selecting Test Features
Using Transmit Overhead Setup
Description You can set an overhead byte to a known static state to aid
troubleshooting, for example to quickly check for "stuck bits" in path
overhead bytes. Transport Overhead, Path Overhead, Trace Messages
and Labels can be set using this feature.
HOW TO: 1 Set up the SONET transmit interface and payload required. See
"Setting SONET Transmit Interface " page 4.
2 Choose the type of overhead to SETUP.
If OC-12 or OC-48 is chosen as the SONET interface, choose the STS-
3# and STS-1# you wish to set up.
If STS-3 is chosen as the SONET interface, choose the STS-1# you
wish to set up.
DEFAULT - Use to set all overhead bytes to the standard values
defined by ITU-T.
If a test function is active then the overhead byte value is determined
by the choices made in the Test Function. If APS Messages is chosen,
for example, K1K2 value is set by the APS Messages setup.