On Tue, Jul 16, 2002 at 12:24:01PM +0100, Karl Jeacle wrote:
> Technically, anything is possible. Commercially, it's not so easy.
Indeed . . .
> I don't know the exact reasons why ADSL/ISDN was not part of the
> initial rollout, but I can think of a few possibilities: reduced
> reach with ADSL/ISDN,
But just as some customers can have ADSL over POTS and some can't, the same
would apply to ADSL over ISDN. And as Kevin said, surely those already using
ISDN would be among those mostlikely to want ADSL ?
> having to dedicate ISDN-only line cards in each exchange
But they have POTS only line cards which can't be used by ISDN customers - I
find that one a bit atrange.
> different/incompatible customer premises equipment (you can't
> use the same modem or router on ADSL/PSTN and ADSL/ISDN) and
OK - I can't speak about Eircom's DSL equipment - I've only worked with the
kit Deutsche Telekom provides. The CPE provided by Deutsche Telekom
consists of a DSL splitter - this is connected to your ISDN S0 bus OR POTS
line and is then connected to the DSL modem (provided by Deutsche Telekom or
numerous other suppliers) which is connected to your box by Ethernet or USB,
depending on what you buy. The splitter has a switch to select between ISDN
and POTS. Can't see what could have prevented Eircom using similar equipment.
> increased complexity in provisioning systems and processes.
There's an issue alright esp. when you consider the debacle with all ISDN
customers being told that their lines weren't suitable for ADSL.
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