Definition 1. - 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 2. - 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.

Definition 3. - 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 4. - 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 Seaton T1 line is in common use today in ISP (Internet Service Provider) connections to the Internet

Seaton, Texas, Apr. 15 /Richard Anderson/ -- Small businesses all over the country are discovering a whole new universe of broadband access. As the price of commercial-grade telecommunication services continues to drop, more and more enterprises are starting to drop their plain old telephone service lines in favor of all-digital T1 trunks that deliver voice and data over the same connection. These new enhancements were made possible by the increasing pace of consolidation in the telecommunication industry along with the increasing value bigger phone companies can provide.

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.

To see how customers are reacting to this new product, we interviewed a series of small business owners in Texas who are currently using the service. One such individual shared with us his enthusiasm for the enhanced capabilities dynamic service offers. "When I was first contacted about the dynamic integrated T1, I was deeply skeptical of what I was hearing. Over the course of my brief dealings with telephone companies, all I got was less service with more cost. Now I am happy to say that I am getting more for less, which makes for one very happy customer."

The two basic Integrated T1 line configurations, as they exist in today's market, are analog and digital. Commonly referred to as "trunks", these 24-channel bundles transmit TDM signals directly to the service provider's network via a local loop. Unlike analog trunks, whose configuration can not change once the channels have been allocated, digital "dynamic" lines can change reconfigure themselves from data, to voice, and back again. This ability to reclaim voice channels for data broadband access when not in use gives the user the performance of two T1's in one.

Hopefully the CLECs can continue to push the boundaries of innovation and economics. The only thing that can keep them from the promise land is the gatekeeper of competition: the Federal Communications Commission, and the huge Bells (AT&T and Verizon - that's you) who make it a point to spend more money lobbying in Washington DC than Exxon Mobile.

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