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 Lena T1 line is in common use today in ISP (Internet Service Provider) connections to the Internet

Lena, Louisiana, Nov. 27 /Richard Anderson/ -- 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.

Is the era of the analog trunk, or bundle of 24 DS-0 (64 kbps) channels, officially over? Possibly, thanks to the two-for-the-price-of-one features of a dynamic integrated T1, which can function exactly like a pure 1.5 mbps data T1 when no one is one the phone, and allocate required bandwidth for voice traffic when a user initiates a phone call. Likewise, as soon as the client terminates the voice session, the 64 KB is re-assigned back to the digital universe. This switch-hitting capability provides all of the feel and function of a data T1 and voice T1, for a fraction of the price.

"The average cost of a business phone line from the Local Bell Operating Company (ILEC) has remained constant for the past ten years" noted Edwin Jones, a senior market analyst and telecom industry expert. "At the same time the prices of T-1 lines have declined from near $1000 per month to a staggering $350. Keeping in mind that a T1 connection is the equivalent of 24 regular phone lines all bundled into one, it comes as no surprise that demand for these services in on the rise."

"True convergence means that I can finally have just one phone company, without being at the mercy of Ma Bell" added Steven Lankto of Jersey City. "Having a data pipe that is intelligent enough to know when it needs to become a voice pipe, without any input from me, is genius. I'm glad that the technology is here and in the price range of businesses like mine." Mr. Lankto isn't alone; there is now widespread acceptance of integrated voice and data service in the New York metro area and across most larger U.S. cities.

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.

"I am very satisfied with my new XO dynamic T1" added Mike McLoude, a small business owner in Santa Monica, California. "The flexible nature of the system allows me to conduct business with the same efficiency as many of my bigger competitors, for less than what they pay." Mr. McLoude is not alone - many Californians are seeing the technology light and taking the leap of faith away from traditional TDM.

Change does not happen quickly in an industry as so heavily regulated as Telecommunications. Recent industry consolidation has provided huge alternatives to the incumbents, who are now under pressure to keep up with new technologies while charging better prices to retain and attract new customer bases. 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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