HP OMNIBER 718 HP 37718A - Manual (Page 73)

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Selecting Test Features
Stressing Optical Clock Recovery Circuits
Stressing Optical Clock Recovery
Circuits
Description Ideally clock recovery circuits in the network equipment optical
interfaces should recover the clock even in the presence of long strings of
0’s. You can check the performance of your optical clock recovery circuits
using the STRESS TEST test function.
The stress test is available at all optical rates.
HOW TO: 1 Set up the SONET transmit interface and payload required. See
"Setting SONET Transmit Interface " page 4.
Choose the required STRESSING PATTERN.
The G.958 test pattern consists of 7 consecutive blocks of data as
follows:
the first row of section overhead bytes, ALL ONES, a PRBS, the first
row of section overhead bytes, ALL ZEROS, a PRBS and the first row
of section overhead bytes.
2 If you choose ALL ONES or ALL ZEROS as the stressing pattern,
choose the number of bytes in the BLOCK LENGTH.