Cases Of Parameter Setting Error Or Mismatch - Xerox WorkCentre Pro 423 Service Manual

2.3.2.9 Cases of parameter setting error or mismatch

If a problem occurs in ISDN communication, a G4/G3 Fax can eject protocol (ICM/G4 and G3
monitor) data for troubleshooting according to the error code. For a G3 Fax, however, an
ISDN line is connected to a TA/router and ISDN-related settings are registered in the
TA/router. A G3 Fax cannot provide ICM monitor data for checking a problem in an ISDN
line. In other words, the TA/router deals with communication until a remote terminal is
connected through the D channel and the G3 Fax deals with communication after switching
to the B channels. For troubleshooting before a remote terminal is connected, the operation
and settings should be checked with the TA/router. This is different from a G4/G3 Fax that
can directly accommodate an ISDN line.
G3 Fax communication through an ISDN line is called ISDN-G3 and can be classified by the
environment into the following:
A: An ISDN line is directly accommodated in a G4/G3 Fax and G3 mode is selected
(manual/auto).
B: A G4/G3 Fax is connected to the S/T point of a TA or router and G3 mode is selected.
C: A G3 Fax is connected to the analogue port of a TA or router. (ISDN connection to
TA/router)
D: A G3 Fax accommodates an analogue line from a PBX connected to an ISDN line
(Net64/1500).
A to C are easy to identify but D should be checked with the client or line maintenance agent.
G4/G3 Fax
Symptom 1: Transmission (or reception) with some G3 Fax machines cannot be
established.
Cause: The settings do not match between the transmission side and the reception side.
Examples of setting error: This kind of error can often be dtermined by analyzing the SETUP
or DISC signal.
Transmission capability mismatch: "3.1 KHz audio" is set on the transmission side and
"Voice" on the reception side (or vice versa). Change the setting of either side to
that of the other side. Set "Communication capabilities" for Able ("TEL" corresponds
to Voice and "G3 Fax" to 3.1 kHz Audio).
In G3 transmission, Able issues a SETUP signal to notify "3.1 kHz Audio" as a
transmission capability after auto dialling or "Voice" after on-hook or manual dialling.
Therefore, try both dialling in G3 transmission to check connection.
The dial-in or subaddress number from the calling terminal does not match that of the called
terminal.
Symptom 2: Transmission to a G3 Fax was attempted in G4 auto mode but failed because
the mode did not change to G3. - Analyze the DISC signal.
Cause: The line environment of the remote terminal may not allow the mode to change from
G4 to G3 automatically.
The mode is changed only when the reason of error code Q.931 from the network is 3 or
88. Depending on the error code, the error processing is classified into three:
WorkCentre Pro 423/428
l Redialling in G4 mode
l No immediate transmission (No redialling)
l Redialling in G3 mode
Therefore, If the error code from network is except for #3 or #88, it is necessary to call in
G3 mode.
Symptom 3: A dial-in number was registered to a fax but an incoming call also rings and
terminates at some other terminals.
Cause: No dial-in numbers are set to some other terminals connected through a bus.
For termination at a specific bus-connected terminal, different dial-in numbers
(subnumbers) should be set to all terminals. (In other words, each terminal requires one
unique dial-in number.)
ISDN-G3 Fax
Symptom 4: No documents can be transmitted or received.
Cause: The TA/router is not set correctly.
In general, an analogue port where a G3 Fax is connected ha several items. If the
parameters are different from the contents of the G3 Fax functions or the ISDN line
contract, transmission or reception may be totally impossible. The parameters differ
between manufacturers or models and cannot be explained all. If possible, connect an
analogue line to the G3 Fax and check the transmission and reception functions of the
fax itself. Then check the settings of the TA/router. Since the check and change
methods also depend on the manufacturer and model, consult the client. In particular,
router communication (10BASE-T connected to LAN port) is different from general
telephone line communication, do not change the settings without permission from the
client. Data may be lost or changed if the cable is disconnected and connected, the
power switch is turned OFF and ON, or the settings are checked and changed.
TA/router setting items (Representative items about G3 Fax: See the product manual for the
contents.)
l Dial-in: Global termination, connected equipment, subaddress, number display, i-
number, and alerting signal
l Calling number indication: Priority termination port and other
Symptom 5: The fax ringer does not sound at termination or sounds with no termination.
Cause: (1) The TA/router alerting signal is set at 1300 Hz. - No ringing
(2) The TA/router alerting signal is different from the NTT signal. - Ringing with no
termination.
Symptom 6: Data or image information communication errors occur frequently.
Cause: (1) The signal level is low because an attenuator is set to the analog port of the
TA/router.
(2) The line quality of the analog port of the TA/router went down and permitted
noises.
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Level 2 Troubleshooting
CHAPTER 2 TROUBLESHOOTING