ADTRAN HDSL2 - Manual (Page 76)

HDSL New Enhanced Feature Overview HDSL2 for General Distribution Installation and Maintenance Practice
B-4 61223HDSL2L2-5B
EEPROM Support
The results of the splice detector are stored to the Electronically Erasable Programmable
Read-Only Memory (EEPROM) on a daily basis at the same time the 24-hour PM registers are
stored to EEPROM. A total of 14 days splice detection history is retained. This history is read
from the EEPROM upon power up.
Event Support
An event log entry “Splice Detector Reset” is made any time the splice detector is reset. Also an
event log entry “Bad Splice Detected” is made on the first detection occurrence seen since the
last splice detection reset. This entry serves to alert the technician that a trouble has been
detected without filling up the event log.
Splice Detection Screens
Chronic Circuit Screen
The Chronic Circuit screen (
Figure B-2 ) 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.”
Circuit ID: Chronic Circuit 01/09/05 11:34:00
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