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

Langdale, Alabama, Nov. 18 /Craig Docken/ -- During the 2000 Internet bubble meltdown, the telecom industry learned the hard way that wild spending on network infrastructure was not the best approach to attracting new business and investment. Over the past 7 years the industry, particularly the CLECs (Competitive Local Exchange Carriers) have been focusing on building products that offer more bang for the buck in order to compete with the Bells in their own backyards. One product that has become the flagship offering to small to medium size businesses is the dynamic integrated T1 line, which combines all the usefulness of 24 regular phone lines into a singe T-1 capable of delivering high-speed broadband on the same connection.

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.

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.

"When we moved into our new location here in Los Angeles" commented John Baker, a small business owner in San Diego, California, "we feared having to sign up for commercial telephone and internet service. Until about a year ago, the services being offered to us were TDM, which doesn't come cheap. Thankfully our Telarus commercial telecom broker recommended that we give TelePacific a try, and we did. One year later, we've never had an erroneous bill, our phone and data are all on one single dynamic T1, and we can focus on what we do best - brokering mortgages."

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."

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.

CLECs are continuing to find new and loyal customers in the small business space, but for how long will this trend continue? Will the RBOCs ever be able to give them a fight on a level playing field? Only the FCC knows that answer to that question - all we can do is be thankful for the past 12 years of progress and hope we never return to the pre-1996 era of Telecommunications. 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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