[rescue] Sun ISDN/IDSL HOWTO? (was Wanted: ISDN equipment)

[Mike Free]

    (from working for belltoush fastaccess tech support for too long) DSL
technologies are high frequency, while ISDN is a full bandwidth spread over
a dedicated line. DSL due to the virtue of it's lowest frequency being
~30KHz can share the line with a voice conversation AND lives through ring
voltage. ISDN to my understanding is a full bandwidth digital signal that
cannot share signals on the line.

Mike Free
----- Original Message -----
From: "Neil McNeight" <mcneight at umich.edu>
To: <rescue at sunhelp.org>
Sent: Thursday, August 16, 2001 12:31 AM
Subject: Re: [rescue] Sun ISDN/IDSL HOWTO? (was Wanted: ISDN equipment)


>
> > From: Brian Hechinger <wonko at arkham.ws>
> >
> > uhm.  ahhhhhhh.  IDSL and ISDN are not at all the same thing.  you can't
hook
> > an IDSL line into an ISDN device and expect it to work.
>
> Crud. I was under the impression that IDSL was just ISDN rebadged with a
> trendy DSL acronym. It probably is at some level, given the speeds listed
> and the fact that it's the only thing that'll reach out here.
>
> Here we go. From the DSL-HOWTO at www.linuxdoc.org:
>
> IDSL:
>
> "ISDN Digital Subscriber Loop, 144 Kbps/144 Kbps is really a new and
> improved ISDN from Lucent Technologies and uses the same 2B1Q line
> encoding as ISDN, SDSL and others. IDSL does require a dedicated line
> however. The benefits are that it is an "always on" technology, like other
> DSLs, and provides an additional 16 Kbps over traditional ISDN. It is
> being marketed by some DSL providers as a low end bit rate option, where
> line quality is not sufficient for higher speeds such as that of ADSL."
>
> Sounds just different enough to keep from working with the LX interface :/
>
> > i think just about any NT-1 should work with the sun stuff.
>
> OK. That's encouraging, if I go that route.
>
> ISDN involves dealing with the drooling pig-fuckers at Ameritech/SBC (as
> would IDSL, at some level, but not as directly...). That's one of the big
> reasons I went with the cable modem first. It's also a big monthly outlay
> of cash ($28 for the line and $100+ for the pipe, plus installation).
> I wish I didn't crave bandwidth so...
>
> -Neil
>
> ---------------------------------------------------+-------------------
> "There is more to life than increasing its speed." | Neil McNeight
>                         -Mahatma Gandhi            | mcneight at umich.edu
> ---------------------------------------------------+-------------------
>
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