Control Channel Signal - Konica Minolta FK-502 Service Manual

FK-502 Service Manual Ver.1.0
(3-3) Phase 3 .....Training of the main channel equalizer
• Band division full-duplex method
• Transmission and reception of Phase 3 signals (S,
which are determined by exchanging INF Oh. (symbol rate, carrier frequency, pre-emphasis filter and
transmission level)
S S
Calling
128T 16T 288T
Called
The speed of the following signals (Phase 3) are determined by INFOh. (The following signals are used in the
main channel in the half-duplex procedure.)
S : Signal which sends alternately 0 point and a point which rotated 0 point counterclockwise
by 90 degrees
: Signal which sends alternately a point which rotated 0 point counterclockwise by 180
degrees and a point which rotated 0 point counterclockwise by 270 degrees
PP : Special signal which is sent from a remote station for adjusting an equalizer
TRN : Training signal. (Symbol rate and duration are determined in INFOh.)

Control channel signal

The following signals are used for establishing the control channel or re-synchronization and retrain. (pecu-
liar to half-duplex procedure)
Modulation method:1200 / 2400bps QAM modulation (600 ± 0.01 symbols / sec). However, training and
synchronous signals are 1200bps.
Calling modem : Carrier
Called modem : Carrier
Sh : Signal which sends alternately 0 point and a point which rotated 0 point counterclockwise
by 90 degrees (the same as S)
: Signal which sends alternately a point which rotated 0 point counterclockwise by 180
degrees and a point which rotated 0 point counterclockwise by 270 degrees (the same as S)
AC : Signal which send alternately 0 point and a point which rotated 0 point by 180 degrees
PPh : Special signal which is sent from a remote station for adjusting an equalizer (used when the
initial of the control channel and re-synchronization are executed)
ALT : Signal which scrambled alternate signals of 0 and 1 (1200bps)
MPh : Binary signal used for exchanging parameters of the modulation method when data is actu-
ally sent and received by using the main channel
(Both type 0 and type 1 (type 0+pre-recording coefficient) must be received.)
(When type 0 is received, pre-recording coefficient is considered to be 0 and never func-
tions.)
E : "1", binary of 20 bit, which represents the beginning of user data transmission on the con-
trol channel
Phase3 Control channel start-up procedure
32T
16T or more
PPh ALT MPh
PP TRN
– 120T or less
70 5ms
PPh ALT MPh
32T or less
Between 16T and 120T
+Guard tone(=1800Hz ± 0.01% (level = set value-7dB))
, PP, TRN) are executed by using parameter values
* : Symbol interval
MPh E control channel data
MPh E control channel data
(=1200Hz ± 0.01% (level = set value))
(=2400Hz ± 0.01% (level = set value-1dB))
PROTOCOL
7-23