James Knott wrote:
There are two flavours of ISDN, basic rate, which is 2 x 64 Kb/s B channels + 1 x 16 Kb/s data or primary rate, which is (in North America) 23 64 Kb/s B channels and one 64 Kb/s D channel.
In Europe, that would be a 30 x 64Kb/s channels - not sure what the D channel would be at, but I'm pretty certain an E1 is 2Mbit/s, whereas an (American) T1 is 1.544Mbit/s.
The B or bearer channels are what carries your data, phone calls etc., and the D channel is used for signaling, status etc. A business with a PBX will often get 1 or more primary ISDN connections.
Yes, bigger businesses probably - we just have 3 BRI lines, equivalent of 6 concurrent calls.
You use a basic rate ISDN for data up to 128 Kb/s, which can all be used for one connection or split for two simultaneous 64 Kb/s connections.
Typically the latter, but nobody really does that today. I did the channel-bundling 128Kbps dial-up back in the 90s, but since around '98, xDSL has been far more bang for the buck. /Per -- Per Jessen, Zürich (13.7°C) -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org