pdhman.book : pdhapp.doc 34 Tue Oct 14 15:00:20 1997
34
PDH / DSn Testing With The HP 37717C
BERT Testing
• Loopback - Error performance measurements are made via a loopback at the
remote end of the system testing the combined Go and Return paths. The
measurements are often performed unattended and the results and other events,
alarms for example, logged on a printer or disc and timed by a real time clock.
Loopback Test
Default (Known State) Settings
It can be advisable to set the HP 37717C to a known state prior to setting up to make
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.
Test Setup Procedure (BERT Testing)
This setup procedure is based on 140 Mb/s, CMI, PRBS test data terminated in 75Ω
A SINGLE test period of 24 HOURS is used and use of the a printer or disc for
recording of results and alarms is included. A graphical record of the results can be
viewed on the HP 37717C display at the end of the test period.
GRAPH
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