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PROTOCOL
Bits (LSB-MSB)
119
120-135
136
137-152
153
154-169
170
171-186
187
▼1 13 and 14 are used when the opposed modem supports up to 1664 points
▼2 Set to 0 on the transmitting modem.
(3-4)
Re-synchronization procedure / Startup procedure
A procedure required to switch control channel and main channel in the half-duplex procedure
A procedure which includes another modulation parameter exchanging is especially called the
startup procedure. (used for changing the communication speed)
Startup procedure
• Control channel startup procedure: See the 3-3 figure. (By exchanging MPh, the communication speed
is changed.)
• "Control channel re-synchronization procedure" is not used.
Re-synchronization procedure
• Control channel re-synchronization See signals related to control channels in 3-3 for signal names and
change method.
Transmitting modem
Receiving modem
Main channel re-synchronization procedure and Turn-off
The receiving modem re-synchronizes the main channel by using the PP signal. After B1, starts receiving
Primary Data.
The transmitting modem sends the scrambled 1's for 35ms after Primary Data transmission has been com-
pleted.
Both modems move to the control channel re-synchronization procedure or the control channel startup
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 for adjusting an equalizer
7-26
Value
0
Start bit
Pre-coding coefficient h(3) Real
0
Start bit
Pre-coding coefficient h(3)Imaginary
0
Start bit
Reserved
0
Start bit
CRC
0
Fill Bits
24T
8T
Main channel data
Sh
Sh
±
70
5ms
Sh
24T
FK-502 Service Manual Ver.1.0
Meaning
16T and more
ALT
E
control channel data
120T or less
ALT
control channel data
Sh
E
Between 16T and 120T
8T
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