Re: ISDN phone lines

From: Richard H. (rh86_at_no.spam)
Date: 03/26/05 

Date: Fri, 25 Mar 2005 21:41:07 -0700

Michael wrote:
> Does an ISDN line function as both a POTS and ISDN
> line. (yes--stupid?)

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.)

> 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

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
    ... > (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.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)
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