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© 2006 - 2008 TOSHIBA TEC CORPORATION All rights reserved GD-1220/1221
DIALING/COMMUNICATION CONTROL
3 - 11
3
4) Training
The training is performed in the binary procedure to surely transmit the image signals.
- Training signal
The training signal is transmitted following the DCS signal at the modem speed specified by the
DCS signal. Responding to this training signal, the receiving side adjusts the auto-equalizer.
- Format of the training signal
14.4 Kbps, 12 Kbps
- 9600 bps, 7200 bps
- 4800 bps, 2400 bps
- TCF signal
An error may occur in the image data if the training is not performed correctly. The transmitting
side sends a TCF signal and checks if any error occurs in image data before the image data
communication to follow. When the receiving side detects an error in the TCF signal, it transmits
an FTT signal to the transmitting side to request the retraining. When there is no error, the receiv-
ing side transmits a CFR signal.
The TCF signal transmits all zeros for 1.5 seconds at the same modem speed as that for the
training signal.
Alternation
of ABAB
Scrambled binary data “1”
Segment 1 Segment 2 Segment 3 Segment 4
106 msec 1240 msec 27 msec 20 msec
1393 msec
Equalizer
adjustment
pattern
Chain-store
information
sequence
TCF
(
Binary
)(
Hexa or octal
)
V.29
No signal
TCF
Repeating 2-state
signal
Scrambled data “1”
Segment 1 Segment 2 / Segment 3 Segment 4
20 msec 53 msec+160 msec 20 msec
253 msec
Non-
modulated
carrier
No signal
(
Binary
)
Scrambled data “1”
(
Hexa or octal)
0° to 180°
2-phase pattern
(
Binary
)
TCF
Continuous
180° phase
inversion
Segment 1Segment 2 Segment 3 Segment 4
4,800 bps: 923 msec,
2,400 bps: 1158 msec
V.27ter
Segment 5