T1 VS ISDN

I got a new system with no documentation and I'm trying to see how
it's setup. Is there any way to tell from the hardware if the phone
line connecting into the server is a T1 or an ISDN? I believe the
cards are interchangable but I could be wrong.

Thanks.

There is nothing interchangable.

ISDN is a dialup technology over a regular phone line using a special modem
that is designed specifically as an ISDN Modem. The Modem connects directly
into a PC (Server) with a typical Serial Cable.

T1 is a speed designation, but it usually a type of frame-relay phone line
(but could be other types) in the physical form of an ethernet cable to goes
into a CSU/DSU which is then connected via Serial Cable into a Router (that
is a "real" router, not a home-user NAT Firewall that marketing calls a
"router"),...which then has the Ethernet Interface (typically E0 or E0/0)
which plugs into the External Interface of a Firewall Device or a Hub/Switch
and then the Firewall device.

ISDN is typically only 64kbps or 128kbps both directions (that's "k", not
"m").

T1, because it is a speed designation, is always 1.54mbps both ways.

ISDN should have went the way of the Dinosaurs by now.
T1s are being undervalued by many business because of the cost and the
slower speed -vs- DSL or CableTV. Business are ignoring the value of the
T1's solid dependablility and flexability because they look at CableTV or
DSL and think that download speed is the only thing that matters.

--
Phillip Windell
www.wandtv.com

The views expressed, are my own and not those of my employer, or Microsoft,
or anyone else associated with me, including my cats.
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