From: snipped-for-privacy@dork.geeks.org (Doug McIntyre) Subject: Re: 2 phone numers on one landline? (Slightly OT) [Telecom] To: snipped-for-privacy@cybertheque.org
Doug McIntyre says: > My newsserver doesn't seem to post correctly to this usenet group.
Original Message: ==================
>>***** Moderator's Note *****
>>>3. Switch to ISDN service, which can provide two separate call paths
>>> on a single pair. It tends to be pricey, but you'll have full use of
>>> both lines at your new location. I don't know if this will work >>> with ADSL.
>The following excerpt is from the Wikipedia article on ISDN:
>
>In Germany, ISDN is very popular with an installed base of 25 million
>channels (29% of all subscriber lines in Germany as of 2003 and 20%
>of all ISDN channels worldwide). Due to the success of ISDN, the number
>of installed analog lines is decreasing. Deutsche Telekom (DTAG) offers
>both BRI and PRI. Competing phone companies often offer ISDN only and
>no analog lines. Because of the widespread availability of ADSL services,
>ISDN is today primarily used for voice and fax traffic, but is still
>very popular thanks to the pricing policy of German telecommunication
>providers. Today ISDN (BRI) and ADSL/VDSL are often bundled on the same
>line, mainly because the combination of ADSL with an analog line has no
>cost advantage over a combined ISDN-ADSL line.
>
>Other replies to this thread seemed to rule-out the ADSL/ISDN combination;
>could someone please elaborate?
There are two widely used parts of the ADSL standards, one for use of ADSL riding an analog POTS line for use in the US, and many other areas. And another part for using ADSL over ISDN, mainly for use in Germany, and other parts of Europe where ISDN BRI is also popular.
Many people believe that ADSL over ISDN isn't possible, because its not offered in the US, and the equipment required for it is different, and they think that two digital services over the same wire would conflict. But it is widely deployed in Germany and other European countries where ISDN BRI is widely installed.
If you look through popular vendors, you'll find many products for ADSLoISDN (ie. the Cisco 876 router). vs ADSLoPOTS (ie. the Cisco 877 router).