Toshiba GD-1210 Service Manual page 58

- Probing/Ranging (Phase 2)
Examines the line characteristics and sets the parameters for the modulation related items such
as the modulating speed.
Transmitter
Signal name
INFO sequence
Tone B
Tone
B
Line probing signal L1
Line probing signal L2
Receiver
Signal name
INFO sequence
Tone A
Tone
A
INFO sequence
GD-1210/1250/1270/1160/1260
DIALING/COMMUNICATION CONTROL
Abbreviation
INFO0c Informs the modem capability
such as modulating speed
and frequency transmission
capability (two frequency
bands (high and low) used to
examine the line characteris-
tics), and requests for adjust-
ing.
B Synchronization between the
modems by 1200 Hz tone sig-
nal
B
L1 Tone signal to analyze the line
characteristics by probing
L2
Abbreviation
INFO0a Informs the modem capability
such as the modulating speed
and frequency transmission
capability.
A Synchronization between the
modems by 2,400 Hz tone
signal
A
INFO0h Based on the analysis of the
line probing signal sent from
the transmitter, it informs the
pre-emphasis filter and modu-
lating speed to be used for the
data transmission.
3 - 16
Function
Transmission rate: 600 bps
is a signal that shifts the
B
phase B 180°.
Probing is to examine the line
characteristics.
Tone signal between 150
Hz and 3,750 Hz in units of
150 Hz
Function
Transmission rate: 600 bps
is a signal that shifts the
A
phase A 180°.
Transmission rate: 600 bps
© 2006 - 2011 TOSHIBA TEC CORPORATION All rights reserved
Remarks
Remarks