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

Definition 3. - 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 4. - 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.

Rominger, North Carolina, Apr. 17 /Michael Johnson/ -- There are two basic "integrated" DS-1 configurations, analog and digital. The 24-line bundle in which they come is termed a "trunk". The main difference between analog and digital trunks is their flexibility. With digital trunks, voice lines not in use can be dynamically reconfigured to carry data traffic, so they don't sit idle. Analog trunks on the other hand can not change their function once configured by the service provider. Data channels remain data channels and the same for voice channels, even if there is no voice traffic.

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.

To illustrate the types of decisions that small business owners are faced with on a daily basis, we interviewed Glenda Probst, small business owner in Los Angeles, California, about her recent move to a dynamic integrated T-1. "I was in a quandary about how to go about expanding the number of voice lines to my business. Before making the move to a dynamic integrated line, I was using POTs lines. After the fifth line, my bill was above $300/month, not including my $100/month DSL connection. Now, I have 12 pure digital voice lines, 1.5 MB of broadband, and I pay under $400 for it. It was a major upgrade in service with a reduction in total price. I only wish I'd learned about this product sooner."

"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.

As the competitive local exchange carriers continue to compete by introducing new and exciting products at prices most small businesses can afford, they are coming up against increasing resistance from the RBOCs who are forces to lease their own copper lines to these CLECs at reduced rates. This reality has the CLECs rushing to deploy their own networks and fiber routes, but the FCC may ultimately relax the mandate - leaving all of us wondering how long the party is going to last.

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