V.8/V.34 Protocol - Ricoh A230 Service Manual

FAX COMMUNICATION FEATURES

2.4.3 V.8/V.34 PROTOCOL

NOTE: 1) Refer to "V.8/V.34 Training Manual" for overall information about
V.8/V.34 protocol.
2) This section explains machine specific functions only.
V.8 in Manual Reception
This machine starts V.8 procedure in order to make V.34 communication enabled
in manual reception, though some other fax machines do not.
Refer to "V.8/V.34 Training Manual – section 3.1" for detailed procedures.
Shift-down Conditions
One-step Shift-Down from Receiving Terminal
NOTE: The receiving terminal must be this machine.
If this machine has sent two PPRs for one ECM block, it will request a one step
shift-down to the sender terminal in the next control channel.
N eor : Number of frame re-transmissions remaining until the Tx terminal sends
DCN to terminate the communication. This is fixed at "9", not adjustable.
A230/A231/A232
TX
33.6kbps
Fax data
1st block P P S - N U L L
33.6kbps Fax data
P P S - N U L L
33.6kbps
Fax data
P P S - N U L L
M P h
31.2kbps Fax data
2nd block
P P S - M P S
31.2kbps Fax data
2nd page P P S - E O P
D C N
N
RX
eor
9 (default)
P P R 8
P P R 7
Shift-down
request
M P h
M C F 9
M C F 9
M C F 9
A693D532.WMF
2-28
SM