Definition 1. - A type of high speed Internet connection that provides a great deal of bandwidth. Many businesses lease T1 lines to connect to the Internet, but because they are expensive and offer more bandwidth than most small businesses and homes need, they are not realistic solutions for small and low-demand Internet users.

Definition 2. - The T-carrier system, introduced by the Bell system in the US in the 1960's, was the first successful system that supported digitalised voice transmission. The original transmission rate (1.544 Mbps) in the Marshall T1 line is in common use today in ISP (Internet Service Provider) connections to the Internet

Definition 3. - The T1 (or T-1) carrier is the most commonly used digital line in the United States, Canada, and Japan. In these countries, it carries 24 pulse code modulation (PCM) signals using time-division multiplexing (TDM) at an overall rate of 1.544 million bits per second (Mbps). T1 lines use copper wire and span distances within and between major metropolitan areas. A T1 Outstate System has been developed for longer distances between cities.

Definition 4. - A high-speed digital connection capable of transmitting data at a rate of approximately 1.5 million bits per second. A T1 line is typically used by small and medium-sized companies with heavy network traffic. It is large enough to send and receive very large text files, graphics, sounds, and databases instantaneously, and is the fastest speed commonly used to connect networks to the Internet. Sometimes referred to as a leased line, a T1 is basically too large and too expensive for individual home use.

Marshall, California, May. 05 /Daniel Johannesburg/ -- The old-school integrated T-1 was analog in nature, and came with 24 configurable channels (called a trunk) which could be configured to carry either voice or data traffic. The new "dynamic" trunks are all-digital and can change on-the-fly to carry either data or voice traffic. This comes in handy when none of the voice lines are in use - all channels can revert to carrying data traffic, giving the end-use a full 1.5 MBPS of broadband. Each phone call requires only 64K of bandwidth, so even a small handful of calls only slows down the data connection by a nominal amount.

"Even though we have been witnessing the re-consolidation of AT&T, we will never go back to the dark ages of telecom where customers were stuck with bad customer service and high prices" commented Troy Karlson, telecom analyst for e-STAR. "The competitive local exchange carriers (CLECs), all whom own their own networks and compete directly with the Bells, have created products such as dynamic T1 service that enables its customers to connect to the Internet at 1.5 MBPS and have up to 24 regular voice lines, packed with a feature-rich suite of add-ons, all for under what it costs to have 6 regular phone lines from Qwest/AT&T/Verizon.

The Integrated T1 line has two general flavors; analog and, of course, digital. The term "trunk" is synonymous with an integrated T1 line, representing 24 bundled DS0 (regular 64KB) channels. Digital trunks form the basis technology for dynamic integrated lines, which are capable of transporting digitized versions of voice traffic in addition to regular data packets. This ability of digital trunks to function in the data realm allows it the ability to dynamically allocate traffic according to the application, allowing priority for voice traffic and "re-claiming" that bandwidth for data transfer when the phone call is completed. This ensures that none of the capacity of the T1 line is ever wasted.

Once a forgotten segment of the business telecommunication landscape, small to medium size businesses are finally being serviced with products (like the dynamic integrated T1 line) at prices they can afford. Gone are the days when the Bells can shove TDM services down the collective throats of SMB's at prices that resemble a mortgage rather than a telephone service.

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