Canon iR1200 Series Service Manual page 364

Chapter 14
Password Used When Making Settings:
A password may also be used for memory lock Rx, call restriction, and Memo other functions. Such a password
consists of 4 decimal characters (0000 through 9999), and it is important to remember that these passwords are used
inside the machine and are not intended for communication proce-dures.
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 mo-dem 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.
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 dial-ing.
T1 Timer:
It indicates the period of time in which a line connection is recognized during reception; specifically, the machine
waits for a significant signal from the together party after trans-mission of DIS.
T5 Timer:
It is the period of time in which RR/RNR is transmitted during an ECM communication.
14.2.1.3 How to Record the Protocol
0006-3530
If you are instructed to "record the communication procedure sound on a DAT or MD, and ask the Technical Center
for analysis", refer to the following diagram for a generally used method of connection:
14-8