T1 line? Totally confused.?

Question

I understand the logical part of T1 in how is splits data into channels that are 64 kbs wide (B-channels), but I'm totally confused as to the physical aspect of a T1. 

Does it use the public telephone network or does it use a proprietary cable (copper or fiber) circuit between the subscriber the switching office? If it doesn't use POTS, then why am I reading that ISDN PRI is basically the same thing as a T1? Isn't ISDN designed to transmit digital data over POTS lines? 

Banging my head against a wall here. lol

Anonymous · Accepted Answer

T1 is just the US definition of the DS1 standard
The carrier will install a line from the telephone exchange to your office that bundles 24x64K channels, each channel being known as a DS0, to give you a DS1 or T1 line 
And this will be over copper
If you use it for data then it has nothing to do with the public telephone network or PSTN
But if you use it for voice then typically it will be to connect your PBX to the PSTN so that you can make and receive phone calls over this
POTS means Plain Old Telephone Service and is more to do with older analogue and digital phone calls. Basically any phone calls not using VoIP are referred to as using POTS so that has nothing to do with lines
And the confusion around ISDN goes back to being able to use a T1 for data or voice
In the voice world you can connect your PBX with an ISDN PRI card to a T1 line for digitial phone calls
And you connect a router an ISDN PRI card and attach that to a T1 line for data transfer
ISDN is another technology for handling voice and/or data

T1 line? Totally confused.?

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