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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
0s. You can check the performance of your optical clock recovery circuits
using the STRESS TEST test function.
The stress test is available at STS-12 and OC-12 if Option 130 or 131 is
fitted. If Options 110/120 are also fitted then the stress test is also
available at STS-12BIN and OC-12.
HOW TO: 1 Set up the SONET transmit interface and payload required.
Choose the required STRESSING PATTERN.
The G.958 test pattern consists of 4 consecutive blocks of data as
follows:
ALL ONES, a PRBS, ALL ZEROS 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.
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