T1 circuits are also high-speed digital connections, which can be
used for voice or data. The T1 transmits data at a speed of 1.544 Mbps,
which is faster than most modems.

T1s are engineered circuits that are used for businesses. The T1
consists of 24 channels, which can be allotted to voice, data or both.
The T1
transmission occurs over two-pair fiber wiring however it is sometimes
brought to the building on regular copper wires.

The circuit is specifically engineered based on the distance from
the central office where it originates to the final location where it
will
terminate. The circuit must transmit at specific speeds and repeaters
are sometimes needed to help boost the signal.

T1 circuits are brought into the business and terminated onto a jack
in the telephone or data room. The jack, called a smart jack, can then
be
used to plug a cable to extend the circuit into the appropriate
equipment. This takes up considerably less space in the telephone room
than
standard telephone lines.

Voice T1s
can be used for both incoming and outgoing calls. The 24 circuits are
fluid and are available to any telephone users when they become
available. This allows the best usage of the lines. Sharing the lines
in this manner lets you have many fewer lines than before. For example,
an office of 50 to 100 people with average telephone needs can easily
be serviced with one T1.

Voice T1s can also be used with DID (direct inward dial) numbers.
DIDs are like private lines. Each telephone user can be assigned a DID
number from a bank of numbers that you order through the phone company.
The DID numbers run over the T1 and can each be assigned to a specific
telephone. The DIDs are able tot be dialed directly from the outside
with no intervention from the company operator for re-direction.

For larger companies that need more lines or those that need
additional bandwidth there are bigger configurations available. The T3,
also
known as a DS3,
is a digital communications link that supports data at a rate of 43.232
Mbps. It is equal to 28 T1 circuits. This high-speed connection can run
any application you may need. If you have a large company or campus
environment the T3 may be a good option. It is also a good option for
those with phone intensive operations such as a call center.

The T1 can't be beat for clarity, reliability and cost efficiency.
It is a highly reliable connection. The T1 is always being monitored at
the
central office and if any problems are detected they can often be
corrected remotely. The T1 offers a clear, crisp sound as well. The T1
is also
quite cost efficient. While there are typically installation charges
these are often made up in the first year, or sooner. Users find
monthly
charges are often much less than what they were paying before. The
additional features and benefits add to the value of the T1. 

Article written by Van Theodrou, go to his site for his low rate guarantee on business long distance and check out his new telecom glossary pages.