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4.6
Communications
This section explains general troubleshooting procedures for the 400 series of Information Codes. These
errors are primarily caused by poor telephone line quality (loss, noise, echo, etc.). This unit is furnished with
Test Mode 1 to assist in troubleshooting line quality problems.
It is suggested that both the transmitting unit and receiving unit be adjusted. This section gives relevant
parameters in Test Mode 1 for the both the transmitting and receiving sides. If no improvement is realized
after the parameters are adjusted, it is recommended that the parameters be returned to the default settings.
4.6.1 Communication Trouble
START
Is this an international
communication?
No
To equalize loss (Amplitude Distortion) between the fax unit
and the phone company exchange
Transmitting Side
To improve a poor S/N (signal–to–noise ratio)
Transmitting Side
#10 : –9 dBm
0 to –8 dBm
#17 : 14400 bps
12000 to 2400 bps
To cope with impulse noise
Receiving Side
#70 : 128
256 to 2048
To cope with shifted signal sequences caused by an echo
Transmitting Side
#25 : 1st
2nd
Perform a communication test after changing settings,
Yes
Transmitting Side
#21 : Off
On
#25 : 1st
2nd
Receiving Side
#13 : Off
On
Receiving Side
#11 : –43 dBm
–33 dBm or –38 dBm
#18 : 14400 bps
12000 to 2400 bps
#23 : Normal
Long
Receiving Side
#24 : 2100 Hz
1080 Hz
#30 : 75 ms
1 sec
Troubleshooting
Receiving Side
12000/TC9600/TC7200/
#18 : 14400 bps
9600/7200/4800/2400
1080 Hz
#24 : 2100 Hz
1 sec
#30 : 75 ms
4–37
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Table of Contents
Troubleshooting
