9
January 2005 © TOSHIBA TEC
e-STUDIO170F Dialing and Communication Procedure
9 - 15
[ 2-2 ]
Probing/Ranging (Phase 2)
Line characteristics are measured, then the parameter setting for modulation such as the modulating
speed, is made.
• Transmitter
• Receiver
Signal name
Abbreviation
Meaning
Remark
INFO sequence
INFO0c
It indicates modem capability such as
modulating speed and frequency trans-
mission capability (two frequency bands
- high and low - used for measuring the
line characteristics), and requests for
adjusting.
Transmission rate: 600 bps
Tone B
Tone B
B
B
Synchronization between modems by
1200-Hz tone
B is a signal that shifts phase
B 180°.
Line probing signal
L1
Line probing signal
L2
L1
L2
Tone for analyzing the line characteris-
tics by probing
Probing is to measure the line
characteristics.
Tone between 150 Hz and
3750 Hz in units of 150 Hz
Signal name
Abbreviation
Meaning
Remark
INFO sequence
INFO0a
It indicates the modem capability such
as the modulating speed and frequency
transmission capability.
Transmission rate: 600 bps
Tone A
Tone A
A
A
Synchronization between modems by
2400-Hz tone
A is a signal that shifts phase
A 180°.
INFO sequence
INFO0h
Based on the analysis of the line probing
signal sent from the transmitter, it indi-
cates the pre-emphasis filter and modu-
lating speed to be used for the data
transmission.
Transmission rate: 600 bps
Summary of Contents for ESTUDIO170F
Page 2: ... 2005 TOSHIBA TEC CORPORATION All rights reserved ...
Page 192: ...e STUDIO170F Function Settings January 2005 TOSHIBA TEC 4 132 ...
Page 214: ...e STUDIO170F Mechanical Description January 2005 TOSHIBA TEC 5 22 ...
Page 308: ...e STUDIO170F Circuit Description January 2005 TOSHIBA TEC 7 78 ...
Page 372: ...e STUDIO170F Removal Replacement Adjustment January 2005 TOSHIBA TEC 8 64 ...
Page 490: ...e STUDIO170F Appendix January 2005 TOSHIBA TEC 12 8 ...
Page 491: ......
Page 492: ......