pdhman.book : pdhapp.doc 55 Tue Oct 14 15:00:20 1997
55
PDH / DSn Testing With The HP 37717C
Multiplexer Testing
Multiplexer Testing
Application
PDH multiplexers combine four lower rate signals into a higher rate signal for
transmission or further multiplexing. It is important that each multiplexer port
operates error free and no "crosstalk" occurs between ports.
Multiplexing of the tributaries can be verified by performing a BER test at each of
the four ports. However a more rigorous test involves loading all four ports to
simulate live traffic conditions. This verifies the individual ports and detects any
crosstalk problems between the ports.
Default (Known State) Settings
It is advisable to set the HP 37717C to a known state before setting up a
measurement. This clears all previous settings and provides a clearly defined
instrument state. For a list of Default Settings and the procedure for accessing them
see Stored Settings.
Multiplexer Test Setup Procedure
The following Options must be fitted to the HP 37717C to perform this test:
• UHC (US6) - Multiple Outputs
• UKJ (USA) or UKK (USB) - PDH Module
In this setup the PDH OUT signal and the three additional data outputs, from the
Multiple Outputs option, load the 34 Mb/s input ports of the multiplexer. The HP
37717C (Structured PDH Option UKJ (USA)) destructures the 140 Mb/s signal and
a BER test is performed on each of the 34 Mb/s signals in turn.
A SINGLE test period of 15 Minutes is used and the selected logging device is
enabled to record results and alarms.
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