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

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. - 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.

Connecticut, Feb. 25 /David Onaindia/ -- The digital universe, and the way people connect to it, is changing. Small businesses, in particular, are discovering new high-speed Internet and telecom options that are now squarely within their budgets. Through a myriad of mergers and acquisitions, telecommunication providers have greatly enhanced their integrated T1 products with features that businesses can't live without, all while dropping the price to about half of what they were just two years ago.

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.

From 1997 to 2007, the average cost of a POTS (plain old telephone service) line from the Bells has hovered in the $50 - $80 per month price range. During this same time period, integrated DS1 (digital signal 1) lines - which is the equivalent of 24 standard lines - have come down in price from $1000 per month to $400. Small to medium size businesses who have more than 5 phone lines can now actually save money by upgrading their service.

Min Lieu owns a small insurance agency in Connecticut. 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."

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.

"For years I've played tug-o-war with the phone company who provided voice and data service to my toy manufacturing company" commented Troy Bergfeld of Houston Texas. "They kept trying to sell me services I didn't need, it took them months to finally send me a correct bill, and I wasn't able to recapture bandwidth from my T1 line when nobody was using the phone. Now that has all changed - my Telarus product specialist recommending I give XO Communications a try. Now I use their FLEX T1 product and I pay less and get exactly what I want. I have even add another T1 seamlessly when the time comes for my business to expand."

But how much longer will we continue to see improved technology, services, and prices? It's all in the hands of the Federal Communications Commission, as they have the power to sqwash the CLECs by proxy. No wonder AT&T and Verizon are the two biggest lobbying powers in Washington. It makes you wonder what kind of services they would be able to offer had they plowed that money into R&D instead of politics. 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.