Page 7-28
Troubleshooting
INTER-TEL
®
AXXESS
®
MANUAL VERSION 11.0 – May 2008
System Issues
(Continued) DISA inoperative
NOTE: Due to the natural characteristics of the CO trunk, the volume level of
DTMF tones transmitted over the trunk may be substantially reduced before reaching
the Inter-Tel system. This natural degradation in tone volume may adversely affect
the reliability of the DISA feature. Other factors which can affect DISA performance
are CO trunk noise and the quality and strength of the DTMF tones generated by the
off-premises phone itself
Unable to interface with com-
puter call-up device (banking
machine, answering machine,
auto dialer, etc.)
Equipment being called is
defective
Ensure that the called equipment is functioning cor-
rectly.
DTMF digit duration/pause
specifications of called
equipment is incompatible
with Inter-Tel system
Check with the equipment manufacturer for DTMF
digit duration/pause specifications. Adjust DTMF
Digit Duration/Pause timer. (See page 6-428 in
PROGRAMMING.) Default value is 6/100 second.
CO trunk is designated for
dial-pulse signaling
CO trunk must be designated as DTMF. See
page 6-244 in PROGRAMMING.
Defective trunk card Replace the associated trunk card.
Defective CPC or CPU Card See page 7-3 for LED and system voltage informa-
tion. Replace the card if faulty.
RFI/EMI present over conver-
sations
AC power source or ground-
ing incorrect
Verify that the AC circuit is isolated and dedicated
and check for proper grounding (see pages 3-10
and 3-81 in INSTALLATION).
Grounding point is source of
RFI/EMI
While the system is running on AC power, tempo-
rarily remove the grounding wire to see if it is the
source of the RFI/EMI. See page 3-81 in INSTAL-
LATION for proper ground requirements.
AC power source is causing
RFI/EMI
If an external battery back-up power source is
installed, switch system operation to battery back-
up power by unplugging the power source's AC
power cord (with grounding wire connected to chas-
sis). If RFI/EMI stops, the AC power source is the
cause. Install an RFI/EMI filter or equivalent on the
AC outlet.
Trunk from central office is
picking up interference
At the CO block, remove the bridging clips for the
trunk. On the telco side of the block, use a test set
to check for interference. Also, move the CO trunk
to a known good CO circuit. If the problem follows
the trunk, contact the telco.
Table 7-6. System Troubleshooting Chart (Continued)
Symptom Possible Cause Corrective Action
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