🚀 go-pugleaf

In article <fa211cda46@lcs.wn.bawue.de>, hubersn@lcs.wn.bawue.de says...
>
>In article <19960605.124615.46@xargle.demon.co.uk>
>          thowat@xargle.demon.co.uk (Tony Howat) wrote:
>
>> In message <4p1r5o$huv@news.ox.ac.uk> Thomas Down wrote:
>> 
>> I think he's talking serial speed which is really a case of the faster the
>> better if your machine can cope with it, especially if you are using
>> compression. Some modems do go faster than 28800 baud (34k ish), but not
>> with demon.
>
>The fastest available modem to date is the USR Courier V34+ which does
>33600 bps. Note that it is "bps" instead of "baud". V32bis for example
>is based on 2400 baud and transmits/receives 14400 bps. IIRC V34 uses
>up to 3200 baud, which is really very close to the physical limit of
>a (good) phone line.

Yes, USR V34+'s also do a 3429 rate - when using it on 'real' links I've 
hardly ever seen it used as it requires a connection with an unusually wide 
bandwidth. The 33600bps speed can be reached using both the 3200 and 3429 
symbol rates I believe.

>I don't know much about modulation techniques, but I don't think that
>33600 bps is the highest possible speed we will ever see...remember the
>old days when they told us that we will never get any higher than 2400 bps.
>

IIR the theoretical limit is around 38000bps, limited by the SNR of the 
connection and the bandwidth of the connection. Shannon's Theorum has all the 
gory details if you're really interested(!)

Cheers,

	Ben.

-- 
Ben Formesyn                                            
formesbc@boat.bt.com