Oki OKIFAX 5750 Maintenance Manual page 25

No.
25 Coding scheme
26 Modem operations
27 Fallback
28 Protocol
41285901TH Rev.3
Item
1) One-dimensional coding scheme:
2) Two-dimensional coding scheme:
3) JBIG (only for OKIFAX 5950)
1) High-speed Modem
2) Low-speed Modem
3) JBIG:
Note: Only for OKIFAX 5950, and JBIG is not per-
4) ISDN G4:
Automatic fallback will occur according to the following
sequences by FTT, RTN or PPR.
Fall-Back
When the last trial fails, the transmitting station sends
out a DCN signal to the remote station for disconnec-
tion.
Note: • Modem automatically performs the fall-back
1) ITU-T Rec. T.30
2) Oki special protocol (speed protocol)
Note: In High-speed protocol, V.34 is not applied.
3) ITU-T G4 Class 1 (option)
Specifications
Modified Huffman (MH)
Modified READ (MR)
Modified Modified READ (MMR)
• ITU-T Rec. V.29 (9600/7200 bps)
• ITU-T Rec. V.27 ter (4800/2400 bps)
• ITU-T Rec. V.17 (14400/12000/9600/7200 bps)
• ITU-T Rec. V.33 (14400/12000 bps)
• ITU-T Rec. V.34 (33600/28800 bps)
• ITU-T Rec. V.21 channel 2 (300 bps) or equivalent
Performs JBIG communication conforming to T.82/
T.85 of ITU-T Rec.
formed in G4 communication.
ITU-T Rec. T.563, T.521, T.503, T.62, T.6, T.70
Transmission
Protocol
Rank Speed (bps)
ITU-T V.17 (V.33)
1st
2nd ITU-T V.17 (V.33)
ITU-T V.17 (V.29)
3rd
ITU-T V.17 (V.29)
4th
5th ITU-T V.27 ter.
ITU-T V.27 ter.
6th
depending upon the line condition.
• V.34 fallback sequence:
The modem automatically selects transmission
speed according to the line condition.
The T.30 handshaking procedure will be conducted
at message transmission speed instead of 300
baud, during transmission multi-page.
No. of RTN
Training receivied
14400 1 1
12000 1 1
9600 1 1
7200 1 1
4800 2 1
2400 2 1
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