Canon iR1600 Series, Service Manual

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CHAPTER 13 TROUBLESHOOTING
COPYRIGHT© 2002 CANON INC. 2000 CANON iR1600/iR2000/iR1610/iR2010 SERIES REV.0 MAR. 2002
13-193
12. Signals
Tonal Signal:
A tonal signal consists of sinusoidal waves of a specific frequency, and may be thought
of as a sound carrying a meaning. CNG, CED, and ANSam are tonal signals.
Binary Signal:
A binary signal is used to indicate the meaning of a procedure. It is either ‘1’ or ‘0’,
modulated according to frequency, and is used as G3 procedure signals.
Procedure Signal:
It is a generic term for a tonal signal and a binary signal.
Preamble:
It is a signal attached to the beginning of a binary signal, and is used to synchronize
modem signals for a procedure signal.
Image Signal:
Of procedure signals, it is used for actual transmission of image data.
Significant Signal:
It is a signal whose significance can be understood by a facsimile machine that receives
it, and it is free of a transmission error.
13. Timer
T0 Timer:
It indicates the period of time in which a line connection is recognized during transmis-
sion; specifically, the machine waits for a significant signal from the other party after di-
aling.
T1 Timer:
It indicates the period of time in which a line connection is recognized during recep-
tion; specifically, the machine waits for a significant signal from the together party after
transmission of DIS.
T5 Timer:
It is the period of time in which RR/RNR is transmitted during an ECM communica-
tion.