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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 Service 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 Service
Mode 1 for 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
No
YesIs this an international
#21 : Off On
#25 : 1st 2nd
#33 : 33600 bps 31200-2400/
TC9600/TC7200
#24 : 2100 Hz
1080 Hz
#30 : 75 ms
1 sec
communication?
Transmitting Side Receiving Side
#10 : -9 dBm 0 to -15 dBm
To improve a poor S/N (signal-to-noise ratio)
#32 : 33600 bps 31200 to 2400 bps
#11 : -43 dBm -33 dBm or -38 dBm
#33 : 33600 bps 31200 to 2400 bps
#23 : Normal Long
Transmitting Side Receiving Side
#13 : 0 dBm 4, 8 or 12 dBm
Receiving Side
To equalize loss (Amplitude Distortion) between the fax unit
and the phone company exchange
#25 : 1st 2nd #24 : 2100 Hz 1080 Hz
#30 : 75 ms 1 sec
To cope with shifted signal sequences caused by an echo
#70 : 128 256 to 2048
To cope with impulse noise
Receiving Side
Perform a communication test after changing settings.
Transmitting Side Receiving Side
Transmitting Side
#14 : 0 dBm 4, 8, 12 dBm
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