Hi Arthur (and Rod),

SA> no, I dont expect anything over 2400 using a V. protocol
SA> on that line..

 RS> Bet you would with V.29

 IS> ?  V.29 is a leased-line protocol.

 AM> Well, a half-duplex protocol that was used by the then
 AM> Telstra for "fast training" modems,

On switched lines?

 AM> and is still used by facsimile machines.

I wonder how?  Ok, I initially relied on my usually reliable Dataplex
product catalogue's Technical Reference section, defining V.29 as a
"9600bps modem standardised for use on point-to-point 4-wire leased
telephone-type circuits."

 AM> Uyless Black or Frank Nitzsche could probably add more detail (-:.

Uyless Black, in the OSI book, from the table of V-Series Interfaces, p.69:

Series Number:        V.29    V.29    V.29
Channel Line Speed:   9600    7200    4800
Separation:           4-wire   ''      ''    <<<
Modulation Rate:      2400     ''      ''
Carrier Frequency:    1700     ''      ''
Use of V.2:           Yes      ''      ''
FDX or HDX:           Either   ''      ''    <<<
Sync or Async:        Synchronous      ''
Modulation Technique: QAM     PS      PS
Bits Encoded:         4:1     3:1     2:1
Backward Channel:     Not Defined
Switched Lines:       No      No      No     <<<
Leased Lines:         PP 4W   PP 4W   PP 4W  <<<
Use of V.25           Not Defined
Use of V.28:          Yes      ''      ''
ISO Pin Connector:    2110     ''      ''
Equalisation:         Adaptive ''      ''
Scrambler:            Yes      ''      ''

As of 1991, anyway .. was there a revision for switched line (or 2-wire) use?

Cheers, Ian

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