Wavetek ANT-20 Operating Manual page 30

ANT-20 NEXT
If widely differing values are measured during three consecutive measurements, the diagnosis
"Clock variable" is given. A diagnosis of "Clock variable" is an indication of synchronization
problems. It may also indicate that a signal with a different bit rate or with a line code that does
not correspond to CMI is present.
If a standard SDH signal is detected, the current SDH alarm situation for the AU-4 and HP levels
will be displayed:
• AU-LOP
• AU-AIS
• MS-AIS
• MS-RDI
• HP-UNEQ
• HP-TIM
• HP-PLM
• HP-RDI
The AU pointer movements will be read out and evaluated for 20 seconds.
Optional measurements
The following optional measurements allow further analysis of the quality of the incoming signal:
• Intrinsic jitter
• G.826 analysis for a period of 15 minutes
– Analysis is referred to "B3/HP-REI" errors for signals with unknown AU-4 payload (in-
– Analysis is referred to the payload if a "PRBS23 Bulk Payload" is detected (out of
Alarms and error messages
If alarms occur or limit values are exceeded, a brief explanatory text is displayed in the "Possible
Causes" field of the "ANT-20 NEXT - [Application]" window. A more detailed cause description
and further information can be displayed if you double-click on the item of interest and the
necessary information is stored in the "knowledge database". You can add to or edit the texts
stored in the "knowledge database".
Also refer to Section 2.6.2 "Customizing an application", Page O-22 for more information.
Adaptations
You can adapt the "Monitoring STM-1, full check (approx. 25 min)" application to suit your
special requirements. This applies to the jitter and G.826 tests in particular. You can also
change the limit values and gate times.
Also refer to Section 2.6 "Creating and customizing applications", Page O-21 for more
information.
SA-20
service).
service).
ANT-20SE
Standard Applications