HDSL4 for General Distribution Installation and Maintenance Practice
HDSL NEW ENHANCED FEATURE OVERVIEW
61223HDSL4L2-5C
B-5
Splice Detection Screens
Chronic Circuit Problems
The Chronic Circuit Problems screen (
) displays general information about circuits
with bad splices.
Figure B-2. Chronic Circuit Screen
NOTE
Since this detector employs a very sensitive measurement, it is
imperative that all obvious troubles be cleared prior to relying on
the splice detection information for troubleshooting the circuit.
This is reflected by the following screen statement: “Wire pairs pass
all electrical tests and meet deployment guidelines.”
Splices that are varying in impedance will cause the HDSL data pump to see a reduced and/or
fluctuating signal quality (margin). The HDSL data pump will attempt to track these changes,
but when the changes become too severe, errors or loss of synchronization result. This is
reflected by the symptoms described on this screen. If a circuit meets these criteria, the possi-
bility of an impedance-varying splice should be considered.
To access a particular menu item, press the number associated with that item, and press
E
NTER
. The menu options are as follows:
•
•
•
Press ESC to return to previous menu
Chronic Circuit Problems
Field experience has shown that many chronic circuit failures are due to
bad splices. These type circuits generally have the following symptoms:
- Wire pairs pass all electrical tests and meet deployment guidelines.
- Large margin fluctuations will occur on the suspect pair. This can be seen
on the Detailed Status Screen. (Min & Max margins differ by > 6 dB)
- Pairs experience errored seconds (ES,SES,UAS) and/or loss of sync (LOS).
- The bad splice will most severely impair the unit closest to the splice.
This HDSL unit has the ability to test for bad splices. This detection
should be used as a last resort after all other loop testing has been
done. The detection is an approximation which can point the technician
to the general area of the suspect splice.(+/- 275 ft). For best
results, re-splice all splices close to the indicated trouble.
1. View Splice Results
2. View Histogram Screen
3. Reset Splice Detector
