Fault Isolation
950-779-115-02, Revision 02
14
March 17, 2000
PRL-770 and PRL-779 List 1E and 2E
Phone does
not stop
ringing
•
faulty subscriber station
instrument
1
If phone stops ringing when using a butt set at the subscriber location, the
subscriber's station internal resistance is too high. Replace phone.
•
loop length too long
2
If phone does not stop ringing when using a butt set at the subscriber location,
one or both of these conditions exist:
•
faulty RT
•
loop length is too long (refer to Specifications)
•
or the RT is faulty
Cannot hear,
cannot be
heard
•
faulty COLU or RT
Lift the jumper in the CO between the CO switch and the COT shelf.
•
If audible level is acceptable, replace the COLU or RT
•
otherwise, the problem is in the CO switch
Table 2.
Subscriber Fault Isolating (Cont.)
Conditions
Causes
Procedures
