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SONET_Usr.bk Page 65 Wednesday, December 13, 2000 11:11 AM
HOW TO:
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Setting the Interfaces - SONET Operation
Setting THRU Mode
3. Payload Overwrite: This mode allows you to substitute a new payload, Section
and Line Overhead (TOH) or Path overhead (POH) in the received signal. The
overhead and payload may be overwritten for STS-3c SPE, STS-1 SPE, VT-6, VT-2
or VT-1.5. Any Path CV errors are recalculated before transmission.
When the PAYLOAD OVERWRITE and/or TOH+POH CHANNEL functions are
enabled, you can manipulate the overhead bytes via the instrument's TEST
FUNCTION folder.
For STS-12C and STS-48C mapping, the PAYLOAD OVERWRITE feature is not
available, and the TOH+POH CHANNEL overwrite feature is available.
1 Make the required SIGNAL RATE choice, and select THRU MODE on the
SONET
display, See "Setting Transmit Interface " page 60.
TRANSMIT
2 Make the PAYLOAD OVERWRITE choice required.
Hitless Mode: The Payload Overwrite enable/disable field (next to the
PAYLOAD OVERWRITE field) defaults to OFF.
If STS-3c SPE, STS-1 SPE, VT-6, VT-2 or VT-1.5 is chosen, the Section, Line
and Path CVs are recalculated before transmission and the Mapping, Selected
VT, VT Payload, Pattern, Tributary Offset and Pattern in other VT's settings are
displayed. To choose the settings in these, See "Setting Transmit Interface "
page 60, steps 4 through 10.
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