Canon FACSIMILE BASIC 2000 Service Manual page 314

Table A-1 Phenomenon Caused by Deteriorating Factors and Countermeasures
Deteriorating
Factor
Group delay The image signals become more dif-
distortion ficult to receive just like as in atten-
uation distortion.
Level variation Lines are missed if the variation is
significant.
White noise Lines are missed if the signal level is
low.
Frequency offset Control procedure may be inter-
rupted.
Phase jitter Lines may be missed if jitter is sig-
nificant.
Impulse noise The same phenomenon as white
noise and level variation occur.
Short break More conspicuous symptoms that
level variation and impulse noise
occur.
Phase hit Lines are missed.
A–8
Phenomenon Countermeasure
—
Improve the S/N ratio.
• Increase the transmission level on
the ATT switch of the SSSW.
• Slow down the transmission
speed.
Improve the S/N ratio.
• Increase the transmission level on
the ATT switch of the SSSW.
• Slow down the transmission
speed.
Improve the S/N ratio.
• Increase the transmission level on
the ATT switch of the SSSW.
• Slow down the transmission
speed.
Improve the S/N ratio.
• Increase the transmission level on
the ATT switch of the SSSW.
• Slow down the transmission
speed.
Improve the S/N ratio.
• Increase the transmission level on
the ATT switch of the SSSW.
• Slow down the transmission
speed.
Countermeasures are difficult to
implement.
Improve the S/N ratio.
• Increase the transmission level on
the ATT switch of the SSSW.
• Slow down the transmission
speed.