Konica Minolta FK-502 Service Manual page 56

Field Service Ver. 9.0 Jan. 2010
C. Procedure details
(1) Phase 1 (V8) ....Beginning of connection between a calling modem and a called
modem
When ANSam / ANS is detected
(CI must be sent three times or more)
1sec
Calling
Called
0.2 sec or more
(*1) One of no signals / C1 / CNG (T.30) / CT (V.25)
(*2) V.34 full-duplex ability in the modulation mode bit is ON.
(*3) ANSam of phase inversion is sent. Phase inversion is an option in case of supporting
only half-duplex. When CM or valid signal from the calling side is not detected, the
procedure is moved to T.30, etc. after 75 ± 5 ms interval.
<Signal Definition>
Signal type Meaning
CI Function dis-
(Call indicator) play on the
calling side
[Comments]
• CI is a signal to carry call function.
• The calling side send CI, CT (Call Tone - V25) or CNG.
• CI transmission and detection are optional.
• The ON minimum time (=3 Period) is of duration of three CI signals in the following
format.
ANSam V.8 proce-
(Modified dure on the
Answer Tone) called side
[Comments]
• Essential for a called machine which supports the V8 procedure.
• 2100 Hz sinewave is phase-inverted by 400 +/-25 ms periods, then amplitude
modulated by 15 +/-0.1 Hz sinewave
• Average value of modulation factor (x) 0.8 +/- .01 < x < 1.2 +/- .01
• Average transmission power compliant to V2
• 2100 +/- 200 Hz external power is smaller than the average power by 24 dB or
more.
0.5 sec or more
(ecno canceler is OFF.)
Te
CI,CI,CI(*1)
ANSam (*3)
5 1 sec or less
Signal direction
call called
→
←
2. COMMUNICATION CONTROL
When JM is detected twice or more
75
CM,CM,CM(*2)
CJ
JM,JM,JM
75
When CM is detected
When CJ or Tone B is detected
twice or more
Signal
Timing of transmission
speed
V21(L) Start: after 0.4 seconds after line con-
(300 bps) nection from ON condition (in the
following format)
Stop: when 3 period or more has
passed after ANSam / ANS is
detected
ON
When 0.2 seconds or more has passed
—
after reception
5ms
To Phase 2
To Phase 2
5ms
ON: 3period< T < 2se
OFF
OFF: 0.4sec < T < 2se
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