Hmmm,
Actually, in the US, the maximum speed of the digital side of a 56K modem
over phone lines is restricted to 53K by the Federal Communications
Commission. Moreover, I used to work with short-range digital modems--we had
banks of 24 with either 23 working at 64K or 24 working at 56K. The rest of
the bandwidth was "borrowed" for channel management. I do not know if a
similar practice is followed for the digital return lines from an ISP, but it
seems likely since the best I have ever seen was 48K.
At this time I am unaware of any test results for "56K" modems that produced
a data rate over 48K on the return leg.
Of course, with cable, satellite dish, and adsl, higher data rates are
possible, but one thing is certain. The bandwidth you experience will be
that available from the nearest bottleneck.
For example when I downloaded the iso9660 image of Festen, I had just tested
my ADSL, and I was clear for 540K up and 690K down. The maximum speed I
could get during the DL was 28Kb/s or about 280K. The total DL took slightly
more than 6 hours.
Civileme
Bug Hunter wrote:
> 56k modems can only theoretically receive at 56k. due to the last few
> thousand feet of wire being analog signal only from your telephone office
> to your house, actual speeds will be around 31,200 to 43,000.
>
> to transmit 56k signals, you must have digital modems at the 56k
> transmit end. This requires at least ISDN service.
>
> bug
>
> On Thu, 15 Jul 1999, Duncan Hall wrote:
>
> > Hi,
> >
> > My office is connected to the web via 128k isdn.
> >
> > I also have a 56k modem connected to my Mandrake 6.0 desktop. I am able
> > to dial in from home also using 56k modem but was wondering how to get
> > 56k speed out of it.
> >
> > I am under the impression that 56k modems only transmit at 33.6 and
> > recieve at 56k. If this is the case is it possible to turn it around so
> > that the modem I am dialing in to at the office transmits at 56k and
> > recieves at 33.6? Is this what ISPs do or are the modems significantly
> > different?
> >
> > I'm using rockwell based dynalink 56k modems at each end.
> >
> > Thanks
> >
> > Dunc
> >
> >
> >
> > --
> > //----------------------------------------------------------------
> > Duncan Hall
> > SysAdmin/WebMaster
> > Viator Systems [ http://www.viator.com ]
> > ... e-commerce systems for the travel industry
> > tel: +61 2 9361 6137 fax: +61 2 9360 9885
> > -----------------------------------------------------------------//
> >
> >
> >
