Some of the
carriers we used to represent include ACC Business
MCI, ISG, New Edge
Networks, Paetec, Qwest,
Savvis, and XO.
What is DSL?
DSL stands for Digital Subscriber Line and is a technology originally
developed by AT&T back in the 1980s. Like a T1, a DSL line can
potentially transmit up to 1.544 Mbps, although it is usually offered in
smaller, fractional configurations for cost savings. It is transmitted
over copper wires and is particularly well-suited for typical residential
and small business installations. It comes in a number of
"flavors" which primarily break down to ADSL (Asymmetric Digital
Subscriber Line) and SDSL (Symmetric Digital Subscriber Line). DSL has
effectively replaced ISDN, a more expensive and lower capacity leased line
What Is a T1 Line?
A T1 is a standard digital transmission link in the United States with
a capacity of 1.544 Mbps. The term was originally created by AT&T and
refers to a level one transmission line. Also known as a DS1 (Digital
Signal 1) line, it uses two pairs of normal twisted wires, the same as
found in most residences. T1 lines handle 24 voice channels (PCM or Pulse
Coded Modulation signals) at 64 Kbps each, but with more advanced digital
voice encoding techniques, they can handle up to 30 voice channels. T1
lines can be transmitted over copper or fiber optics and are used to
connect networks across remote distances using bridges and routers and can
often be connected directly to new PBX systems with most T1 providers.
What Is a T3 Line?
A T3 is the equivalent of 28 T1 lines and can carry a DS-3 (Digital
Signal 3) at 44.746 megabits per second. It's generally used for
connecting larger computer networks. Also an AT&T term, T3 and DS3 are
used interchangeably, just like T1 and DS1 are used interchangeably. T3
lines are usually transmitted over fiber optic connections.
What Is an OC3 Line?
A OC3 is the equivalent of 100 T1 lines or a little more than 3 T3
lines and can carry a total signal at 155 megabits per second. It's
generally used for connecting very large computer networks and works only
over fiber optic connections.
What Is an OC12 Line?
A OC12 is the equivalent of 400 T1 lines or a little more than 14 T3
lines and can carry a total signal at 622 megabits per second. It's
generally used for connecting extremely large computer networks and works
only over fiber optic connections.
What Is an OC48 Line?
A OC48 is the equivalent of 1600 T1 lines or a little more than 56 T3
lines and can carry a total signal at 2488 megabits per second. It's
generally used for connecting extremely large computer networks to each
other over long distances and works only over fiber optic connections.