Re: ISDN phone lines

From: Nico Coesel (nico_at_puntnl.niks)
Date: 03/27/05 

Date: Sun, 27 Mar 2005 15:03:56 GMT

"Richard H." <rh86@no.spam> wrote:

>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.

Sorry, that's not true. Depending on the settings in the public
network, an ISDN line is put in 'standby' and needs to be activated
before use. 

-- 
Reply to nico@nctdevpuntnl (punt=.)
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Relevant Pages

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  • Re: ISDN phone lines
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    (sci.electronics.basics)
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