Multiplexer Testing - HP 37717C Operating Manual

Communications performance analyzer, pdh / dsn

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PDH / DSn Testing With The HP 37717C

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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