Definition 1. - 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 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 Millboro T1 line is in common use today in ISP (Internet Service Provider) connections to the Internet

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.

Millboro, Virginia, Nov. 12 /Brendan Luna/ -- The way business connect to the digital universe is changing. More and more enterprises are discovering the new broadband options made available to them through a series of cost cutting measures by telecommunication providers. With the recent rush to consolidate, more and more features are being crammed into the current service offerings, which continue to fall in price bringing products like integrated T1 service into the price range of the vast majority of small to medium-size businesses.

Dynamic integrated T1s are a fairly new phenomenon. Unlike their analog counterparts that can never deviate from their initial set up configurations, dynamic T1s are able to convert voice phone calls into data packets and them prioritize their delivery through an all-digital trunk. The ability to break everything down into the lowest common denominator (digital) allows the system to change on-the-fly to reclaim phone lines for high speed Internet the second the phone call is terminated. An integrated T1 essentially provides the end user the same service as one data T1 line and one voice T1 line, for half the cost.

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."

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 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.

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. Recent advances in technology, fostered by competition from growing CLECs, is bringing integrated T1 services to small business everywhere. And the trend doesn't look like it will change anytime soon. CLECs continue to grow their networks, offering more advanced services like metro ethernet, MPLS, and more.

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