What is the diff between a T1/T3/128

What is the diff between a T1/T3/128

Post by george.ro.. » Thu, 26 Mar 1998 04:00:00



Quote:>Sorry everbody who thinks these are redundant questions ( I seriously am not
>able to find the documentation for this stuff)

>but what is the diff between

>T1?

A digital facility with a throughput (bandwidth) of 1.544 Megabits/second,
or the equivalent of 24 voice telephone lines, each with a bandwidth 64
Kilobits/second (or 4 KHz analog).

Quote:>T3?

The equivalent of 28 T1s, or slightly less than 45 Megabits/second
bandwidth.

Quote:>128?
>ISDN?

ISDN is a method of bonding two 64 Kbps signals into a single stream 128
Kbps digital stream. It is typically a switched connection, in the same
sense as a regular voice telephone line, while T1s and T3s usually refer to
a dedicated facility.

A normal voice analog telephone line of 4 Kilocycles (aka KiloHertz) is
optimally converted to a digital signal of 64 Kbps. This is also sometimes
referred to as a DS0 (Digital Signal level 0), while T1s and T3s are also
typically referred to as DS1 and DS3 signals respectively.

Quote:> >thanks a lot >~vince

Hope this helps,

George