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,

 IS> On switched lines?

 AM> Not sure.

Ta.  I'm still curious if V.29 was later respecified or updated, or if V.17
etc 'adapted' its techniques to 2-wire switched mode?  Not a big deal ..

 IS> defining V.29 as a "9600bps modem standardised for use on
 IS> point-to-point 4-wire leased telephone-type circuits."
[..]

 AM> Group 3 Facsimile uses V.29 in switched, two wire, half
 AM> duplex mode, and includes option for error correction mode
 AM> (ECM) which is required for the binary file transfer (BFT)
 AM> option.

Ah, which answers someone else's question about EC for fax .. this is
adding data link layer stuff to V.29, or perhaps rather its use by .. ?

 AM> Not exactly a "V-Series modem", but is does provide the
 AM> capabilities to send and receive files over 2 wire voice
 AM> band lines with help from V.21 between pages/files.

Ok, thanks for the update.  I think my brain needs backing up to tape and
reformatting .. :)

Cheers, Ian

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