Canon FAX L1000 Service Manual page 233

c-4) Image transmission speed change from the receiver
The receiver returns to the PPh signal in response to the Sh signal from the transmitter.
The image transmission speed is then determined by the MPh sequence sent from both
modems.
Figure 3-39 Image Transmission Speed Change from the
Receiver
FAX-L1000 Chapter 3: Technical Reference
TX RX
Image
data
Turn-off
Sh
Sh
PPh
ALT
PPh
ALT
ALT
MPh
MPh
MPh
MPh
E E
PPS-NULL
flags
flags
PPR
flags
"1"
S
S
PP
B1
Image
data
Turn-off
3-89