Solving Nbx Telephone Problems - 3Com 3C10220 - Ethernet Power Source Supply User Manual

30 C 3: T
HAPTER ROUBLESHOOTING
Solving NBX
Telephone
Problems
If power is not reaching an NBX Business Telephone, use the information
in Table 7 to resolve the problem.
Table 7 Solving NBX Business Telephone Problems
Problem
No characters appear in
the telephone LCD display.
Possible Cause Suggested Action
Faulty connection
I
The telephone may
I
be faulty.
Note: You do not need to
connect the telephone to the
Ethernet to perform this check.
Faulty Ethernet
I
cable between the
telephone and the
wall jack
I
Note: If information appears in
the LCD display, the EPS,
telephone, power splitter, and
Ethernet patch cable are fully
functional.
Faulty EPS port
I
Faulty power
I
splitter
Faulty connection
I
between the wall
jack and the EPS
Verify all physical connections.
Supply power to the
telephone using the standard
external adapter that comes
with the telephone. If any
characters appear in the LCD
display, the telephone is not
faulty.
Take the telephone and the
Ethernet cable to the EPS
location and connect the
telephone directly to an EPS
output port (one of the top
row of connectors).
If information does not appear
in the LCD display, replace the
Ethernet patch cable, being
sure to use one that is wired
for all eight pins.
Plug the telephone into
another EPS output port.
Replace the power splitter.
Verify that the Ethernet wall
jack is connected to the EPS. If
that is not the source of the
problem, check the cables and
connections between the wall
jack and the EPS.