Re: ADSL Backup facilities

David Bradley <trolley@xxxxxxxxxxxxxx> wrote:
[...] a home user could switch to a dial up connection, but that would
be quite impratical in an office of, say, half a dozen computers being
served out of a router.

It depends what users are doing. If they are mostly doing email then a
dialup replacement for ADSL could be acceptable for a few hours,
especially if that dialup is over ISDN.


The possabilty exists to have another telephone line with ADSL from
an alternative ISP but I can't see how a failure of the primary ISP
can have a seemlesss change over to the other ISP

There is kit available that will share traffic between two ADSL lines.
Also I believe Andrews & Arnold and Nildram both offer Bonded ADSL,
but in this case both lines are to the same ISP.

at the very least it would be a case of patching cables and then there
is the issue of SMTP in the email clients.

If you are serious about using two (or more) suppliers then you should
also be looking at running an in-house mail server - at the very least
one that collects email from your ISP and handles delivery for your
staff. In conjunction with some decent switching software the whole
process can be made totally transparent to your users.

Such a mail server would ease the pain of a slow dial-up connection,
since as far as your users were concerned email would be just as fast
as normal (it would take longer to be delivered, but that would be in
the background).


ISDN backup from the same ISP is a possibility. but when you are
connected by ADSL2 with speeds around 5mb, a drop down to sub 1Mb is
going to be a culture shock.

If the alternative is no service then ISDN is a very acceptable
alternative. In real use it actually feels surprisingly fast.


What are others doing to ensure a 100% service; I would love to know.

Two ADSL lines from separate suppliers. Ideally one of them from an
LLU provider and the other from a BT ADSL based provider. Even better,
bi-directional satellite to a third provider.

The bottom line is that you cannot guarantee 100% service. No-one can
offer that, and no-one should expect it.

Chris
.

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