Cross Multiplexer Testing - HP 37717C Operating Manual

Communications performance analyzer, pdh / dsn

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PDH / DSn Testing With The HP 37717C

Cross Multiplexer Testing

Options Required Structured PDH UKJ (USA)or UKN (USE)

Application

For comprehensive testing of network equipment it is essential that the test

equipment can multiplex/demultiplex the test signal.

The insertion of tributary signals into the PDH multiplexer, which are then

multiplexed into the 140 Mb/s PDH structure should take place without introducing

errors. The insertion and structuring process is tested by adding a test pattern to the

tributary inserted at the tributary insert port. At the high rate side of the PDH

multiplexer the tributary is destructured and a BER test performed.

By using a protected monitor point at the high rate side of the PDH multiplexer the

mux/demux need not be taken out of service.

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 in the Mainframe Operating Manua.

Cross Multiplexer Testing Test Setup Procedure

In this setup a 2 Mb/s Framed tributary, containing a test pattern, is inserted at the

tributary insert port of the PDH multiplexer. The 140 Mb/s structured PDH signal is

obtained from a protected monitor point. The 2 Mb/s tributary is destructured by the

HP 37717C test set and an Error measurement is performed on the 2 Mb/s tributary

test pattern.

A SINGLE test period of 24 HOURS is used and the printer is enabled to record

results and alarms.

The HP 37717C PDH/SDH test set GRAPHICS function is enabled. The graphical

results can be viewed on the

GRAPH

display.

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