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

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.

Adolphus, Kentucky, Oct. 14 /Kiersten Thomas/ -- Business broadband, its price, and who can afford it, are changing. Every day an increasing number of business are finding the new broadband services made available to them by the "new" telecommunications companies that are emerging from the latest round of mergers and acquisitions. Overlapping networks are being consolidated into bigger and leaner footprints, lowering the cost of dynamic integrated digital signal 1 (DS1) service to the price range of about five regular phone lines. Small to medium size business can now afford services once reserved for the Fortune 1000 companies.

Min Lieu owns a small insurance agency in Kentucky. Five years ago he signed up with XO Communications for a TDM-based integrated T1 line for $870/month, which did not include local or long distance calling. Recently, he was offered XO's version of a dynamic circuit called "XO Flex" for half of the price he was already paying. "I would have been a fool not to take the deal" stated Mr. Lieu. "I'm able to add headcount with additional voice lines, without any increase in expense or degradation in high-speed Internet performance."

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.

Integrated T1s comes in two basic configurations: digital and analog trunks, with a trunk being a 24-line (or channel) bundle. The newer, digital trunks, however, are able to run both voice and data over the same channels. By assigning priority to the voice traffic whenever it is present, a dynamic integrated trunk can provide the end-user with a full 1.5 MBPS of data throughput if no phone calls are in progress. As more voice lines are required, less data lines are available. Analog trunks are all pre-assigned to either voice or data traffic, and do not reconfigure in the event there is no voice traffic.

The same basic economic model described in the book "Blue Ocean Strategies" is now being applied to telecommunication services being offered to small businesses across the country: more value for less money. According to many industry watch dogs, hundreds of thousands of business will dump their POTs lines in favor of dynamic integrated T1 service within the next 12 to 24 months, saving money in the process. With the introduction of sub-$475 dynamic integrated T-service, customers are now able to receive up to 1.5 MBPS of high-speed Internet with 24 digital phone lines all on one line, for less than what they pay now for 5 regular phone lines" Stallions continued.

"What we're seeing here is the Bells holding their prices steady and milking their high margins on POTS (plain old telephone service) lines for as long as possible. With the lower prices being offered by CLECs (Competitive Local Exchange Carriers) on dynamic integrated T-carrier services, the Bells are scrambling to keep pace before enterprises realize they can actually save money by upgrading to bigger and more reliable circuits." commented Don Rosebush, industry expert.

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. Evolution has lead to a better, cheaper alternative to TDM services that the Bells were peddling for decades in a vacuum of competition. Now the industry, lead by the innovation and great business practices of the CLECs, seems to have turned a corner - leaving the incumbents playing catchup. Obviously, the main benefactor of all of this competition is the small to medium size business - a segment of the market that was taken for granted until today.

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