[H-GEN] RE: RH PPP Dialer & initialisation string!

Rob Kearey mammal at optushome.com.au
Fri Feb 23 00:22:03 EST 2001


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Steve wrote:

> > They guarantee a baud rate, not a bit rate. I believe the figure they assure
> > is 2400 baud.

> This is surprising, I thought the garunteed baudrate was 300bps.

Don't confuse baud with bitrate. Telstra gaurantees 2400 baud and that's
that. Anyone who's getting high bitrates across that is just lucky,
according the Ye Olde Telstra Signalling people. Bigpond salespeople, of
course, will tell you something different.

> The phone system is analogue only to the cable box. From then on its a digital
> connection. This means connection speeds upwards of 53000 are possible. I
> heard tales of 54000 and 54666 connections using this service. Apparently the
> lines are very stable.

No, it's still analogue 'til you get to the big MUX at your local cable
node - it's hybrid fibre-cable, after all. The lines are also prone to
near-random shifts in relative power (25db suddenly become 35db which
then becomes 18db and so on), with corresponding wierdness on the part
of the poor confused modem.

You are *most* unlikely to get a sustained connection of greater than
~48k, no matter who tells you differently. The PSTN is *not* a nice
place for data-over-vf stuff, and that's just a fact of life.

> I also heard tale of DTMF tones being misinterpreted due to bad communication
> becuase the person was near the end of the cable run. (This would cause
> consistant misdialings. 3373 would consistantly be interpreted as 33773 etc.)

Hah - that's a faulty handset! Had a few of them.

> Steve.

--
Rob K
http://members.optushome.com.au/mammal
Please abbreviate 'bandwidth' as 'bndwth'
thereby conserving precious bndwth.

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