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

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. - 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 4. - 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.

Antioch, Texas, Jul. 04 /Don Romburgh/ -- Small businesses all over the country are discovering a whole new universe of broadband access. As the price of commercial-grade telecommunication services continues to drop, more and more enterprises are starting to drop their plain old telephone service lines in favor of all-digital T1 trunks that deliver voice and data over the same connection. These new enhancements were made possible by the increasing pace of consolidation in the telecommunication industry along with the increasing value bigger phone companies can provide.

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.

"Even though we have been witnessing the re-consolidation of AT&T, we will never go back to the dark ages of telecom where customers were stuck with bad customer service and high prices" commented Troy Karlson, telecom analyst for e-STAR. "The competitive local exchange carriers (CLECs), all whom own their own networks and compete directly with the Bells, have created products such as dynamic T1 service that enables its customers to connect to the Internet at 1.5 MBPS and have up to 24 regular voice lines, packed with a feature-rich suite of add-ons, all for under what it costs to have 6 regular phone lines from Qwest/AT&T/Verizon.

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

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.

The two basic Integrated T1 line configurations, as they exist in today's market, are analog and digital. Commonly referred to as "trunks", these 24-channel bundles transmit TDM signals directly to the service provider's network via a local loop. Unlike analog trunks, whose configuration can not change once the channels have been allocated, digital "dynamic" lines can change reconfigure themselves from data, to voice, and back again. This ability to reclaim voice channels for data broadband access when not in use gives the user the performance of two T1's in one.

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. The recent progress made by CLECs leaves us thinking in hypotheticals. "What if the Clinton administration wouldn't have passed the Telecommunications Act of 1996, requiring RBOCs to lease their lines at reduces rates to the CLECs?" "Will the FCC continue to enforce this law, or will it be overturned by the powerful AT&T and Verizon lobbyists?" It is impossible to know either way, but for the time being we can just be grateful that the industry has evolved to the point were small businesses can actually benefit from telecommunications at an affordable rate.

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