Table of Contents
Advertisement
2. COMMUNICATION CONTROL
G. Re-synchronization procedure / Startup procedure
• A procedure required to switch control channel and main channel in the half-duplex pro-
cedure
• A procedure which includes another modulation parameter exchanging is especially
called the startup procedure. (used for changing the communication speed)
(1) Startup procedure
• Control channel startup procedure: See the 3-3 figure. (By exchanging MPh, the commu-
nication speed is changed.)
• "Control channel re-synchronization procedure" is not used.
(2) Re-synchronization procedure
• Control channel re-synchronization See signals related to control channels in 3-3 for sig-
nal 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 transmis-
sion has been completed.
• 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 coun-
terclockwise 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
B1
:High-speed signal of one frame length which is sent at the end of a series of
startup sequence in the selected modulation parameter.
Control channel data
Transmitting modem
Receiving modem
Control channel data
44
24T
8T
Main channel data
Sh
Sh
±
70
5ms
Sh
24T
128T
16T
S
S
70 ± 5ms
Service Manual
Field Service Ver. 7.0 Jan. 2009
16T and more
ALT
E
control channel data
120T or less
ALT
control channel data
E
Sh
8T
Between 16T and 120T
Data
PP
B1
Main channel
To Control channel re-synchronization / Control channel startup procedure
Turn-off
35ms
Scrambled 1's
70 ± 5ms
Y104784-2
Advertisement
Table of Contents
