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  • ISDN boxes outside

    From Marco Moock@21:1/5 to All on Sun Oct 8 14:14:43 2023
    Hello!

    https://www.markloveless.net/blog/2020/8/28/tales-from-the-past-dealing-with-atampt
    That article mentions ISDN boxes outside of the house in the US.

    I am from Germany and I don't know about them. Here ISDN terminators
    (called NTBA) are mounted inside. They had the 2-wire Uk0 Bus at the
    carriers side and the S0 bus on the customers side and were connected
    to the TAE telephone socket, so no technician needed to come home when
    ISDN was ordered.

    What are exactly these ISDN boxes referred in the article?
    What came out at the customers side?
    An S0 bus or something else?

    --
    kind regards
    Marco

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Michael Trew@21:1/5 to Marco Moock on Sun Oct 8 23:06:22 2023
    On 10/8/2023 8:14 AM, Marco Moock wrote:
    Hello!

    https://www.markloveless.net/blog/2020/8/28/tales-from-the-past-dealing-with-atampt
    That article mentions ISDN boxes outside of the house in the US.

    I am from Germany and I don't know about them. Here ISDN terminators
    (called NTBA) are mounted inside. They had the 2-wire Uk0 Bus at the
    carriers side and the S0 bus on the customers side and were connected
    to the TAE telephone socket, so no technician needed to come home when
    ISDN was ordered.

    What are exactly these ISDN boxes referred in the article?
    What came out at the customers side?
    An S0 bus or something else?

    I'm not quite sure. Most telco's have their newer plastic demarc box on
    the outside of the home here. I've still seen older homes with the
    2-wire solid core non-twisted pair (looks like a lamp cord) going inside
    to the old ceramic fused demarc, which is grounded to the cold water
    line, and mounted to a wooden stud in the cellar ceiling.

    I coerced the AT&T tech to put the new plastic demarc box for the phone
    and ADSL into the cellar of my home, instead of drilling an unsightly
    plastic box into the exterior brick of my home. They put a new twisted
    drop line in, and I replaced the interior wiring, with a whole-home ADSL filter. Lucky for me, I have a clear phone line in all weather.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Fred Goldstein@21:1/5 to Marco Moock on Mon Oct 9 11:53:29 2023
    This is a multi-part message in MIME format.
    On 10/8/2023 8:14 AM, Marco Moock wrote:
    Hello!

    https://www.markloveless.net/blog/2020/8/28/tales-from-the-past-dealing-with-atampt
    That article mentions ISDN boxes outside of the house in the US.

    I am from Germany and I don't know about them. Here ISDN terminators
    (called NTBA) are mounted inside. They had the 2-wire Uk0 Bus at the
    carriers side and the S0 bus on the customers side and were connected
    to the TAE telephone socket, so no technician needed to come home when
    ISDN was ordered.

    What are exactly these ISDN boxes referred in the article?
    What came out at the customers side?
    An S0 bus or something else?

    Honestly, I don't recognize those boxes either, and I was very deeply
    involved in US ISDN.

    In the US, the BRI handoff was at the U interface, not S/T, and the S/T
    bus was almost never used, except perhaps in some office Centrex
    arrangements. In most cases there was no physical NT1 either; the CPE
    typically just implemented the US 2B1Q format U interface.

    --
    Fred R. Goldstein k1io fred "at" interisle.net
    Interisle Consulting Group
    +1 617 795 2701

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    <div class="moz-cite-prefix">On 10/8/2023 8:14 AM, Marco Moock
    wrote:<br>
    </div>
    <blockquote type="cite" cite="mid:ufu6fj$3363a$[email protected]">
    <pre class="moz-quote-pre" wrap="">Hello!

    <a class="moz-txt-link-freetext" href="https://www.markloveless.net/blog/2020/8/28/tales-from-the-past-dealing-with-atampt">https://www.markloveless.net/blog/2020/8/28/tales-from-the-past-dealing-with-atampt</a>
    That article mentions ISDN boxes outside of the house in the US.

    I am from Germany and I don't know about them. Here ISDN terminators
    (called NTBA) are mounted inside. They had the 2-wire Uk0 Bus at the
    carriers side and the S0 bus on the customers side and were connected
    to the TAE telephone socket, so no technician needed to come home when
    ISDN was ordered.

    What are exactly these ISDN boxes referred in the article?
    What came out at the customers side?
    An S0 bus or something else?

    </pre>
    </blockquote>
    Honestly, I don't recognize those boxes either, and I was very
    deeply involved in US ISDN. <br>
    <br>
    In the US, the BRI handoff was at the U interface, not S/T, and the
    S/T bus was almost never used, except perhaps in some office Centrex
    arrangements. In most cases there was no physical NT1 either; the
    CPE typically just implemented the US 2B1Q format U interface. <br>
    <br>
    <pre class="moz-signature" cols="72">--
    Fred R. Goldstein k1io fred "at" interisle.net
    Interisle Consulting Group
    +1 617 795 2701</pre>
    </body>
    </html>

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From David@21:1/5 to Marco Moock on Mon Oct 9 19:18:52 2023
    On 10/8/23 8:14 AM, Marco Moock wrote:


    What are exactly these ISDN boxes referred in the article?

    You seem to be describing a NT1, which converts from the 1-pair BRI from
    the telco to the 2-part, multipoint, ST bus. The phones and routers were
    on that ST bus.

    But here, many ISDN installations used a single box with both parts
    within it; it terminated the BRI, and also provided a router and/or POTS
    jack.

    The outside box might have been a NT1, or more likely the overvoltage "protecter" on any line entering a building. It shunts a lightning
    spike, etc. to ground.

    Unlike the EU, US ISDN was an overall failure. It got use in several
    specific markets; it was popular for radio broadcasters on remote
    broadcasts, offering dual dependable, noise-free circuits without
    expensive point-to-point leased circuits. Classical music stations loved
    it.

    Other users include large Centrex accounts. ('Centrex' was a PBX-like
    telco offering, offering 4-digit dialing within the company, and each
    phone has its own 10 digit number. The switching was done by the Central
    Office switch.) ISDN Centrex allowed phones with multiple-line buttons,
    and other features. Centrex was very popular with US Government offices
    in the DC region, because many agencies are sprawled over multiple
    buildings, yet every fellow employee was a 4-digit dial away.

    But residential ISDN phone service was not a success here; the Bells
    regarded it as a premium service, and priced it as one. It was used for Internet dialup, as its 64Kbs was better than a 28.8Kbs modem; it was
    soon surpassed by DSL and Cable modem data.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)