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FK-502/Network Fax Service Manual Ver.3.0
(3-2)
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 (compensation values of
maximum data rate, transmission level, pre-emphasis (*))
*
linear equalizer for compensating amplitude distortion
INFO0c
Calling
Called
INFO0a
*2
A
:
2400Hz tone signal output from the called side (Level is a set value -1dB). 1800Hz guard
tone (Level is a set value -7dB) is output simultaneously from the called side.
:
2400Hz tone signal output from the called side (Phase inversion of A) . 1800Hz guard tone.
B
:
1200Hz tone signal output from the called side
:
1200Hz 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 150Hz from 150
to 3750Hz (except for 900, 1200, 1800 and 2400Hz))
L1:
L2:
INFO h
:
Binary signal for indicating parameters used in Phase 3 (training of main channel 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
INFO 0x Bit Assignment
Bits (LSB-MSB)
0-3
4-11
12
13
14
15
16
17
18
10ms
B
B
*1
40 10ms
A
A
50ms or more
10ms
160ms
Maximum 550ms+TRDEx
Value
1111
Fill Bits
01110010
Bit string for frame synchronization
0/1
2743 symbol / sec support
0/1
2800 symbol / sec support
0/1
3429 symbol / sec support
0/1
Ability to transmit at low carrier frequency at 3000 symbol / sec
0/1
Ability to transmit at high carrier frequency at 3000 symbol / sec
0/1
Ability to transmit at low carrier frequency at 3200 symbol / sec
0/1
Ability to transmit at high carrier frequency at 3200 symbol / sec
550ms+RTDEc or less
160ms
L2
L1
25ms
A
670 ms or less
Level= Set value+6dB
Level = Set value
Meaning
PROTOCOL
70
5ms
B
To Phase 3
INFOh
7-21
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