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FAX-L1000 Chapter 3: Technical Reference
b) Typical protocol
Figure 3-35 Typical Protocol
CNG
ANSam
JM
CM
CJ
INFO0a
INFO0c
B
A
Connected to the line
L1
L2
A
B
INFO0h
S
PP
TRN
PPh
ALT
MPh
MPh
E
flags
TSI
DCS
"1"
flags
S
PP
B1
Image
data
PPh
ALT
MPh
MPh
E
NSF
CSI
DIS
flags
CFR
flags
"1"
DCN
Turn-Off
ALT
Sh
E
flags
MCF
flags
ALT
Sh
PPS-EOP
flags
E
Line released
Line released
Network interaction
(Phase 1)
Probing
(Phase 2)
Primary channel
equalizer training
(Phase 3)
Control channel
start-up
(Phase 4)
Control channel
Primary channel
resyncronization
procedure
Image data
TX
RX
Control channel
resyncronization
procedure
(Communication end
procedure)
A
NSS
V.8
V.34
Declares the usable modulation
mode.
Declares that V.34 capability exists
oneach machine, andtransfers the
V.34 procedureswith phase 2.
After declaring the modem's
modulation speed capacity, etc. to
each machine, the receivingside
determines the modulation speed
based on the resultsof an probing
signal output by thetransmitting
side.
The transmitting side outputsa
training signal to determinethe
image transmission speed.
The optimumimage transfer speed
is determined by thecondition in
whichthetrainingsignal isreceived.
The pre-message protocol isdone
in the same way as a normalT.30,
at 1200bps.
Thetraining signalisoutput withthe
determined parameters, and
continues to transmit theimage
data.
Thepost-message protocol isdone
in the same way as a normalT.30,
at 1200bps.
B
A
S
S
Sh
Sh