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Selecting Test Features
Using Transmit Overhead Setup
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. Section Overhead,
Path Overhead, Trace Messages and Labels can be set using this feature.
HOW TO:
1 Set up the SDH transmit interface and payload required. See "Setting SDH
Transmit Interface " page 29.
2 Choose the type of overhead to SETUP.
If STM-4 OPT or STM-16 OPT is chosen as the SDH interface, choose the STM-
1 you wish to set up.
DEFAULT - Use to set all overhead bytes to the standard values defined by
Bellcore/ANSI.
If a test function is active then the overhead byte value is determined by the
choices made in the Test Function. For example if APS Messages is chosen, the
K1K2 value is determined by the APS Messages setup.
3 If SOH (Section Overhead) is chosen, choose the COLUMN to be displayed.
Many bytes in COLS 2,5,8 and 3,6,9 are unlabeled as the other overhead
functions have not yet been defined.
If ALL COLUMNS is chosen, the hexadecimal value of all 81 bytes of the STM-
1 section overhead selected are displayed (all 324 bytes of an STM-4 or 1,296
bytes of an STM-16 are displayed 81 bytes at a time by selecting each STM-1 in
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