When did ISDN 128k come about?

I know 64k was around since forever, but when was doubling the baud
possible? The earliest post talking about ISDN 128 on Usenet I could
find was in 1991. Any of you alive at the time of the transition from
using shitty 300 baud modems to broadband?

Industrial One <(E-Mail Removed)> wrote:
> I know 64k was around since forever, but when was doubling the baud
> possible? The earliest post talking about ISDN 128 on Usenet I could
> find was in 1991. Any of you alive at the time of the transition from
> using shitty 300 baud modems to broadband?

300baud? 110 on a paper teletype. Puleez.
Chris

On Tue, 17 Mar 2009 08:31:57 -0700, Industrial One wrote:

> I know 64k was around since forever, but when was doubling the baud
> possible? The earliest post talking about ISDN 128 on Usenet I could
> find was in 1991. Any of you alive at the time of the transition from
> using shitty 300 baud modems to broadband?

Well, I never used and "shitty 300 baud modems", but I did use some that
did what they were supposed to do. I think I still have a 1200 bps modem
around somewhere in a box.

Industrial One wrote:

> I know 64k was around since forever, but when was doubling the
> baud possible?

Standard ISDN lines provides 1 D channel and 2 B channels. Any
number of B channels can be bundled for a connection.

So 2 * 64kbaud = 128kbaud

However there are other ISDN line types, like "primary
multiplex", which provide much more B channels, which can be
bundled as needed.

Before SDSL was avaliable, this kind of connection was often used
in companies requiring substantial bandwidth. However primary
multiplex ISDN is/was quite expensive.

Wolfgang

Industrial One <(E-Mail Removed)> wrote:
> I know 64k was around since forever, but when was doubling the baud
> possible? The earliest post talking about ISDN 128 on Usenet I could
> find was in 1991. Any of you alive at the time of the transition
> from using shitty 300 baud modems to broadband?

There was a rather long sequence of increasing baud rates in modems
before broadband.

My last regular use of 300 baud was probably ca 1984 when my
contribution to Senior Prank Day (highschool) was to program my ][+ to
have the attached Hayes modem dial most numbers at my school at
random.

Before I had any work-sponsored ISDN some time in the mid/late 90's
I'd worked my way up through 14.4 and 56k modems.

rick jones
--
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these opinions are mine, all mine; HP might not want them anyway...
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

On Mar 17, 9:50 pm, Wolfgang Draxinger <wdraxin...@darkstargames.de>
wrote:
> Industrial One wrote:
> > I know 64k was around since forever, but when was doubling the
> > baud possible?
>
> Standard ISDN lines provides 1 D channel and 2 B channels. Any
> number of B channels can be bundled for a connection.
>
> So 2 * 64kbaud = 128kbaud
>
> However there are other ISDN line types, like "primary
> multiplex", which provide much more B channels, which can be
> bundled as needed.
>
> Before SDSL was avaliable, this kind of connection was often used
> in companies requiring substantial bandwidth. However primary
> multiplex ISDN is/was quite expensive.
>
> Wolfgang

So, 128k ISDN lines were available the same time as 64k? Why did it
take until later for 128k to be adopted? I assume 2 B channels would
be more expensive or something and prices later dropped when ISDN
terminals were more widespread.

Also, when DID ISDN become available. I know someone who claims he had
ISDN since 1986, but the ITU page lists it was approved in 1988. Am I
missing something?

Industrial One wrote:

> So, 128k ISDN lines were available the same time as 64k?

Yes. This is the lower bound. Every ISDN line must have at least
2 B channels.

> Why did it take until later for 128k to be adopted?

Ask your ISP. The ISP must support bundeling to be usable by the
customer. If the ISP doesn' support it, then you can't use it.

> I assume 2 B channels would be more expensive or something and
> prices later dropped when ISDN terminals were more widespread.

There have always been at least two B channels. Otherwise the
whole point of ISDN would be missed.

> Also, when DID ISDN become available.

In germany quite early (mid 1980-ies). No suprise at it was
developed there. Whenever a new telecommunications technology is
developed in germany, people can participate it some kind
of "beta" program.

> I know someone who claims he had ISDN since 1986,

Quite possible, if he was in one of those beta programs
(german "Pilotprojekt")

> but the ITU page lists it was approved in 1988.
> Am I missing something?

ISDN went through several development iterations, like every
technology. And prior to standardisation some practical
experience is a must. Thus those "Pilotprojekte", in which new
technology is made avaliable to a selected group of people,
before the technology gets standardised.


Wolfgang

On Mar 17, 9:37*pm, Industrial One <industrial_...@hotmail.com> wrote:

> So, 128k ISDN lines were available the same time as 64k?

There never were 64K ISDN *lines*. There were 128K ISDN lines with two
64K data (called "bearer") channels. They also included a control
channel, perversely called the "data" channel.

> Why did it
> take until later for 128k to be adopted? I assume 2 B channels would
> be more expensive or something and prices later dropped when ISDN
> terminals were more widespread.

To get 128K you make two connections and you bind them. I'm not sure
of the exact history, but prior to multilink PPP, there were pretty
much only proprietary protocols to bind the two channels together.

One early problem with supports 128K ISDN for ISPs was that if the
customer called in twice, there was no good way to make sure both
calls terminated at the same device. Until Ascend came up with
multichassis multilink PPP (where one 64K channel is tunneled over the
Ethernet to a 'master' chassis that's the logical link endpoint) it
was very difficult to support 128K ISDN at a large ISP.

> Also, when DID ISDN become available. I know someone who claims he had
> ISDN since 1986, but the ITU page lists it was approved in 1988. Am I
> missing something?

ISDN was developed from 1982-1986. It was first tested with actual
traffic in 1984. 2B+D began the first commercial operation in Japan in
1988, with NTT's Tokyo/Osaka/Nogoya deployment. I don't think anyone
used it outside of Japan for live traffic in 1986.

DS

David Schwartz wrote:

> ISDN was developed from 1982-1986. It was first tested with
> actual traffic in 1984. 2B+D began the first commercial
> operation in Japan in 1988, with NTT's Tokyo/Osaka/Nogoya
> deployment. I don't think anyone used it outside of Japan for
> live traffic in 1986.

In Germany ISDN was avaliable sice 1984 for selected customers
resident in Mannheim and Stuttgart. To the general german public
it is avaliable since 1992, though it took until 1994 making all
POTS infrastructure ready for ISDN.

Wolfgang

David Schwartz <(E-Mail Removed)> wrote:
> ISDN was developed from 1982-1986. It was first tested with actual
> traffic in 1984. 2B+D began the first commercial operation in Japan
> in 1988, with NTT's Tokyo/Osaka/Nogoya deployment. I don't think
> anyone used it outside of Japan for live traffic in 1986.

That would be consistent with my seeing some as an undergrad at CMU
'84-'88 I doubt it was a commercial instance of it.

rick jones
--
Process shall set you free from the need for rational thought.
these opinions are mine, all mine; HP might not want them anyway...
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...