Re: ISDN phone lines

From: Michael (newszz10_at_yahoo.com)
Date: 03/26/05 

Date: Sat, 26 Mar 2005 08:35:50 -0500

> Sortof. You can buy an endpoint that can convert each channel to a POTS
> port. The ISDN service knows when a POTS call vs. a data call is being
> established; voice calls won't setup on a data-only endpoint & vice-versa.
> (An endpoint with both is smart enough to route incoming calls to POTS vs.
> data port.)

Do most of the ISDN phone "systems" have this ability?
(I would think they ALL would have this endpoint bulit in?).

>> So on an ISDN line you would still see 90vac ringing voltage from ANY
>> incoming call? (yes--stupid?)
>
> No. An ISDN line is not like a POTS line. It's a 2-wire always-on data
> circuit. The endpoint maintains a full-time heartbeat with the telco
> switch at the other end. "Calls" are established via setup commands over
> the wire. Calls are tagged as voice vs. data and get routed
> appropriately.
>
> If you have a POTS port on your endpoint (to connect your phone), it will
> generate the ring pattern and voltage locally.
>
> Richard

Thanks kindly Richard.
I wanted to detect ring with a normal POTS detector at 90vac---I would
imagine they generate the same (or close).

My question was more about ISDN "systems" rather than just a single
dedicated line and certainly they're going to be backwards compatible.

This "D" channel ring stuff was scaring me.

Relevant Pages

  • Re: ISDN phone lines
    ... > (An endpoint with both is smart enough to route incoming calls to POTS vs. ... > data port.) ... Do most of the ISDN phone "systems" have this ability? ...
    (sci.electronics.design)
  • Re: ISDN phone lines
    ... > Does an ISDN line function as both a POTS and ISDN ... You can buy an endpoint that can convert each channel to a POTS ... calls to POTS vs. data port.) ...
    (sci.electronics.basics)
  • Re: ISDN phone lines
    ... > Does an ISDN line function as both a POTS and ISDN ... You can buy an endpoint that can convert each channel to a POTS ... calls to POTS vs. data port.) ...
    (sci.electronics.design)
  • Re: ISDN phone lines
    ... >> Does an ISDN line function as both a POTS and ISDN ... You can buy an endpoint that can convert each channel to a POTS ... >calls to POTS vs. data port.) ...
    (sci.electronics.design)
  • Re: circuit for separating ISDN from DSL
    ... ringing impulse with ISDN and POTS? ... you have ISDN, ADSL, and DSL in a package? ... ISDN facility can be shared as a POTS facility. ...
    (sci.electronics.basics)