T
ECHNICAL
P
ROBLEM
S
OLUTIONS
DX-120 Installation and Maintenance Manual
- 78 -
Digital telephone
erratic operation:
• Erratic LED/LCD
operation
• Faint data noise
in the
background
during
conversations
Digital Volt/Ohm
Meter
Cable distance is
too long for gauge of
wire/cable used.
If a digital telephone is not receiving clear 2B+D
signaling from the KSU, test as follows:
With station cable cross-connect (jumper) wire
removed and telephone unplugged:
Place a short circuit across the inside wiring
cable pair at the user end (jack) of the cable.
With a DVM:
Measure the short circuit resistance one way.
The short-circuited cable pair ohm reading
should not exceed 34 ohms.
Non-standard
telephone cable
being used.
Each digital telephone should operate on one
dedicated, unshielded, twisted pair cable to avoid
data noise and interference between adjacent cable
pairs.
Multiple digital
extensions being
fed from one
common cable or on
the same cable pair.
Other party cannot
hear you (handset)
Another digital
telephone
Component failure
1) Lift handset.
2) Dial another digital extension.
3) Confirm connection of audio.
If audio is one-way only
4) Replace handset and repeat steps 1-3.
If problem persists…
5) Replace handset cord and repeat steps 1-3.
If the problem persists…
6) Replace the telephone.
Diagnostic Quick Reference Chart (continued on next page)
Diagnostic Quick Reference Chart (continued)
Symptom(s)
Diagnostic Aid
Cause(s)
Action
Содержание comdial DX-120
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