Xerox WorkCentre Pro 423 Service Manual page 136

WorkCentre Pro 423/428
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Using NET1500 (Primary group interface)
NET1500 has a communication speed of 1.5 Mbps and provides up to 24 channels of 64
kbps lines. By contract, 384 kbps and 1.5 Mbps lines are also available in 24B (B channel x
24), 23B+D (B channel x 23, D channel), and high-speed communication modes.
When using a G4/G3 fax on NET1500, take out a 64 kbps line from the PBX and connect the
fax machine to the line. However, the 64 kbps line is different from that of NET64.
l The PBX manages lines by extension numbers.
l The number of B channels can be set to 1 or 2.
When connecting a G4 Fax to NET1500, register its extension number at "ISDN number" in
the G4 parameters. If "office number + telephone number" is registered, the PBX may reject
a call as a wrong number. Check with the PBX agent and register the correct number.
By PBX setting, one B channel can be allocated. This setting permits only one session
through the line. If G4 communication is attempted during G3 communication, "No available
channel" occurs. The fax side can not cope with this error and two B channels should be set.
A line in a fax can be identified as NET64 or NET1500 by the DSU position. A DSU for
NET1500 is mounted before PBX and usually not visible. For NET64, the line is directly
connected into the DSU. (The DSU may be hard to see if it is located at a distant position for
the convenience of wiring.)
 PBX accommodation
For fax use, NET1500 is always accommodated in a PBX.
precautions.
NET64 may be accommodated in a PBX. If a special number is added before a telephone
number, an ISDN line may be acquired from outside lines for communication. See 5-2-3,
"NET1500" because this kind of system may manage lines by extension numbers. However,
the line configuration is 2B + D.
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G4 Fax connection to S/T point of TA or router
A G4 Fax is connected to the S/T point of a TA or ISDN router. Therefore, a G4Fax cannot
be connected to a TA/router with no S/T point.
If the TA/router has a built-in terminator, turn the resistor ON and do not attach any terminator
to a connection block on the line. If Layer-1 errors occur because the line distance from DSU
is long and several terminals are connected, however, turn OFF the terminator of the
TA/router and install a terminator to the farthest connection block.
2-104
03/02
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G3 Fax connection to analogue point of TA or router (ISDN-G3)
A G3 Fax connected to the analogue port of a TA/router.
"Communication capability" is an important parameter in analogue port settings. Set "3.1 kHz
Audio" or "Voice" here. A signal from the network (notifying of the remote terminal setting" is
compared with this setting. If the settings do not match, a call does not terminate. For
example, a TA/router where only "3.1 kHz Audio ("FAX" for some terminals) rejects an
incoming call declared as "Voice" from the network.
If possible, enable the termination of both "3.1 kHz Audio" and "Voice." If the model permits
the setting of either "3.1 kHz Audio" or "Voice" only, it is recommended to set "3.1 kHz Audio."
Setting "3.1 kHz Audio" will reduce the number of calls to be rejected. This setting may be
called "FAX" or "TEL" for some models. In addition, setting "NON" may allow some models
to accept both "3.1 kHz Audio" and "Voice."
The analogue port settings include "Alerting signal." The TA/router alerts a terminal by 16 Hz
or 1300 Hz (no ringing).
convenience of the client, set either alerting signal. Most models of TA/router allow individual
settings to analogue ports.
See "NET1500" for the
CHAPTER 2 TROUBLESHOOTING
Level 2 Troubleshooting
According to the functions of the connected terminal or the