Oki OKIFAX 5950 Series Maintenance Manual page 25

No. Item
25 Coding scheme
26 Modem operations
27 Fallback
28 Protocol
OF5750/5950 Series January 2001
Specifications
1) One-dimensional coding scheme:
Modified Huffman (MH)
2) Two-dimensional coding scheme:
Modified READ (MR)
Modified Modified READ (MMR)
3) JBIG (only for OKIFAX 5950)
1) High-speed Modem
• 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)
2) Low-speed Modem
• ITU-T Rec. V.21 channel 2 (300 bps) or equivalent
3) JBIG:
Performs JBIG communication conforming to T.82/
T.85 of ITU-T Rec.
Note: Only for OKIFAX 5950, and JBIG is not per-
formed in G4 communication.
4) ISDN G4:
ITU-T Rec. T.563, T.521, T.503, T.62, T.6, T.70
Automatic fallback will occur according to the following
sequences by FTT, RTN or PPR.
Fall-Back
Protocol
Rank
1st ITU-T V.17 (V.33)
ITU-T V.17 (V.33)
2nd
ITU-T V.17 (V.29)
3rd
ITU-T V.17 (V.29)
4th
ITU-T V.27 ter.
5th
ITU-T V.27 ter.
6th
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
depending upon the line condition.
• V.34 fallback sequence:
The modem automatically selects transmission
speed according to the line condition.
1) ITU-T Rec. T.30
2) Oki special protocol (speed protocol)
The T.30 handshaking procedure will be conducted
at message transmission speed instead of 300
baud, during transmission multi-page.
Note: In High-speed protocol, V.34 is not applied.
3) ITU-T G4 Class 1 (option)
1 - 16
Transmission No. of RTN
Speed (bps) Training receivied
14400 1 1
12000 1 1
9600 1 1
7200 1 1
4800 2 1
2400 2 1