Specifications

Troubleshooting the 9783 239
G.8 Voice Ports
This section presents possible responses to general problems associated with
the IBM 9783 voice ports.
PROBLEM: When attempting a flash-hook, the voice call is dropped.
Cause: The unit’s call processing disconnect delay parameter is set
too low. This situation is common in units that are upgraded
from V1.10 or prerelease versions to V1.14 and later.
Response: Set the CALL_PROCESSING
DISCONNECT_DETECT_DELAY parameter to between 700
and 1000 msec. (This parameter has a default value of 800
msec in V 2.04.)
PROBLEM: Modem data cannot be passed.
Cause: In versions up to and including V1.14, adaptive VAD disrupts
modem data.
Response: For modem transparency, the vocoder must be set to ATC,
and VAD must be set to OFF or FIXED.
PROBLEM: International 40-MIPS AVFAX cards are not working.
Cause: International 40 MIPS AVFAX cards are not supported in any
release prior to V1.10.
Response:UsetheSHOW CONFIG UNIT command to verify that the system
code is not V1.10 or earlier. If necessary, contact IBM for the
latest code release.
PROBLEM: Unable to ring telephones.
Cause: Missing or bad ringer card.
Response: Verify that the ringer card is installed properly, reseat it with
power off, and reboot the unit.
PROBLEM: Voice port signaling functions properly, but the audio path is
silent.
Cause: Missing jumpers in the domestic unit (this applies in countries
exclusive of the European Union and Australia).
Response: With power turned off, install J34 jumpers on the
mother-board (they are adjacent to the ringer card
connector).
PROBLEM: The audio emits a squealing sound when force-connected.
Cause: Vocoder or rate mismatch.
Response: Set the vocoder and vocoder rate on each end of the
connection to identical values.
PROBLEM: Connection is terminated before the far-end can answer.
Cause: NO_ANS_RING value is set too low; therefore, the call is
aborted too soon (64 seconds is the maximum).
Response:PerformtheCALL_PRO NO_ANS_RING <msec> command. There is
no penalty for using the maximum value of 64000 (which
allows ringing for up to 64 seconds).