CTP Systems CTPhone 1900, Applications Manual

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DOC00101-01 5-5
Diagnostics and Troubleshooting
Analog Line Circuit
If users complain about noisy circuits or problems with dial tone, try switch-
ing the user to another circuit on the office telephone system. If a circuit is
not operating at all, you can also use an installer’s test set at individual
MDF/IDFs to check continuity throughout a system.
If multiple users are complaining about noise, check whether the problems
are isolated to circuits 1–8, 9–16, 17–23, or 24–32. The problems might be
related to a faulty Analog Line Module in the CTPhone Controller. This
problem could be checked or isolated by switching Analog Line Modules
(see page 3-15 for instructions).
Component Problems
If one system component is indicating a problem, try replacing it with a
known good one. For example, you can switch individual base stations,
Analog Line Modules, or handsets to see if problems persist.
System Reset
As a last resort, sometimes resetting the CTPhone Controller will clear up
system problems. Before resetting your system, collect as much informa-
tion as possible in the current CTPhone Manager log file. Get traffic statis-
tics reports, call status reports, line and base station status reports, and
alarm reports. Then save the information in the log file to a file of another
name by using the Save As command.
To reset the system, follow the instructions in the CTPhone Manager on-
line help.
9 Based on which pins returned a valid reading in step 8, check
readings between the following pairs:
Valid reading pins 24/50 – measure pins 25/49
Valid reading pins 24/25 – measure pins 49/50
The readings between the sets of pins you measure should
be similar.
10 If the multimeter reports no reading or high resistance, check
the readings between any of the other pins specified in step 6
– step 9.
If you get correct readings after performing step 10, the
transmit and receive pairs are probably reversed or shorted
somewhere in the installation. If not, there are open connec-
tions somewhere in the installation; check and correct all
punch down connections and repeat step 6 – step 9.
+
Checking CTPhone Controller-Base Station Cable Distance