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Field Service Ver. 7.0 Jan. 2009
E. Phase 2 (Probing) ..... V.34 basic setting
• Exchange of modulation ability
• Measurement of line characteristics (bi-direction)
• Determination and exchange of compensation values to line characteristics (compensa-
tion values of maximum data rate, transmission level, pre-emphasis (*))
*: linear equalizer for compensating amplitude distortion
INFO0c
Calling
*1
Called
INFO0a
*2
A
:2400 Hz tone signal output from the called side (Level is a set value -1dB).
1800 Hz guard tone (Level is a set value -7dB) is output simultaneously from
the called side.
:2400 Hz tone signal output from the called side (Phase inversion of A). 1800
Hz guard tone.
B
:1200 Hz tone signal output from the called side
:1200 Hz tone signal output from the calling side (Phase inversion of B)
INFO 0x
:Binary signal for indicating auto modulation option signal
(x=a/c: a: called side, c: calling side)
L1, L2
:Signal for conditioning line characteristics (tone synthesis at the interval of 150
Hz from 150 to 3750 Hz (except for 900, 1200, 1800 and 2400 Hz))
L1:
160ms
L2:
Maximum 550ms+TRDEx
INFO h
:Binary signal for indicating parameters used in Phase 3 (training of main chan-
nel equalizer). This signal is sent from a modem receiving main channel data
to a transmitting modem.
*1 INFO 0c Bit28 OFF
*2 INFO 0a Bit28 OFF
Y104784-2
10ms
160ms
B
L1
B
40 10ms
A
A
670 ms or less
50ms or more
10ms
Service Manual
2. COMMUNICATION CONTROL
550ms+RTDEc or less
L2
B
25ms
A
INFOh
Level= Set value+6dB
Level = Set value
70
5ms
To Phase 3
39
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