pdhman.book : pdhapp.doc 26 Tue Oct 14 15:00:20 1997
26
PDH / DSn Testing With The HP 37717C
Alarm Monitoring
Alarm Monitoring
Options Required Structured PDH UKJ (USA) or UKN (USE)
Application
Problems in the network at all levels in the hierarchy can be detected by the
occurrence of alarms in each tributary of structured PDH systems.
Using the HP 37717C in a receive only mode, each tributary can be scanned and the
state of Frame Loss, Remote (RAI) and AIS alarms viewed on the
display.
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 (Alarm Monitoring)
This setup procedure is based on Structured PDH 140 Mb/s line traffic interfaced at
the line equipment 75 Ω protected Monitor point. If a protected Monitor Point is not
available then an HP 15510A Protective Probe may be used at an unprotected
Monitor point.
When 120 Ω Balanced alarm monitoring is desired at an unprotected Monitor point
use an HP 15511A Protective Monitor Probe. The instrument is used in a receive
only mode to monitor Frame Loss, AIS and Remote alarms.
RESULTS
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