| ign="center"> | | | | fiber optic lines, and the telephone company uses |
| AT&T T1 line can carry approximately 192,000 bps - | | | | various designations to talk about the ability of a fiber |
| about 60 times more than a regular residential modem. | | | | optic cable. If your office has AT&T T1 lines, it means |
| It's also very reliable, a lot more reliable than the analog | | | | the telephone company has brought fiber optic line |
| modem. Depending on the activity, T1 line can normally | | | | inside the office, but AT&T T1 lines can also be copper |
| handle relatively few people. In general browsing, | | | | wires. The AT&T T1 connection can bring twenty-four |
| hundreds of users make it easy to share a T1 | | | | digital voice channels, or it may carry data at a speed |
| connection comfortably. But, if they all download MP3 | | | | of 1.5 megabits per second. If the T1 line is used for |
| and video files at once would be a problem, but this is | | | | phone calls, it connects to the office telephone system. |
| not very common. AT&T T1 may cost between | | | | If it carried data then it plugs in the network router. The |
| $1,000 and $1,500 each month depending on who | | | | price of an AT&T T1 connection can be expensive, |
| offers it and where it leads. The other T1 line end | | | | but we all know price drops when the demand for it |
| should be connected to the Web server, and the total | | | | increases. |
| cost is the combination of the phone company | | | | Internet Service Provider (ISP) leases AT&T T1 lines in |
| charges and the ISP charges for payments. Large | | | | order to provide service to their network of |
| companies need more than that since T1 is only equal | | | | customers. The other kinds of multiplexed fiber optic |
| to 1.544 megabits per second or 24 DS0 lines. | | | | lines are in T2 and T3 lines, which can transport up to |
| Most of us know a normal residential line from the | | | | 44.73 megabits per second. The T3 line, being its more |
| telephone company. A normal telephone line is | | | | advanced version is equivalent to 28 T1 lines, and is |
| delivered on copper wire pairs that transmit your voice | | | | used by many large companies with higher voice and |
| as analog signal. When using a normal modem on this | | | | data demands, among others. There are more |
| kind of line, it can transmit data at probably 30 kilobits | | | | sophisticated T-line standards, but they are not yet |
| per second (30,000 bits per second). The phone | | | | widely in use by the customers and clients. |
| company moves almost all voice traffic as digital | | | | Author is a telecommunications provider who loves to |
| signals instead of analog signals. The analog lines are | | | | read books about business management, travel, and |
| converted into a digital signal by sampling it at 8,000 | | | | engineering. He's been writing about breakthrough |
| times per second in 8-bit resolution, which is 64,000 bits | | | | technologies like AT&T T1 and OC3 for years. |
| per second. Almost all digital data now runs through | | | | |