What is T1 or DS1?

Digital signal 1 (DS1, also known as T1, sometimes "DS-1") is a T-carrier signaling scheme devised by Bell Labs.[1] DS1 is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside of North America, Japan, and South Korea. Technically, DS1 is the transmission protocol used over a physical T1 line; however, the terms "DS1" and "T1" are often used interchangeably. Also, the 24 channels of traffic in a T1 line are sometimes called a T-span.

A DS1 circuit is made up of twenty-four 8-bit channels (also known as timeslots or DS0's), each channel being a 64 kbit/s DS0 multiplexed pseudo-circuit. A DS1 is also a full-duplex circuit, meaning, in theory, the circuit can send 1.544 Mbit/s and receive 1.544 Mbit/s concurrently. A total of 1.536 Mbit/s of [1] bandwidth is achieved by sampling each of the twenty-four 8-bit DS0's 8000 times per second. This sampling is referred to as 8-kHz sampling (See Pulse-code modulation). An additional 8 kbit/s is obtained from the placement of a framing bit, for a total of 1.544 Mbit/s, calculated as follows:

How fast is T1 and other designations?

Some large companies need something more than a T1 line. The following list shows some of the common line speed designations

DS0 – 64 kilobits per second
ISDN – Two DS0 lines plus signaling (16 kilobytes per second), or 128 kilobits per second
T1 Line Internet – 1.544 megabits per second (24 DS0 lines)
DS1 Line Internet – 1.544 megabits per second (24 DS0 lines)
T3 – 43.232 megabits per second (28 T1s)
OC3 – 155 megabits per second (84 T1s)
OC12 – 622 megabits per second (4 OC3s)
OC48 – 2.5 gigabits per seconds (4 OC12s)
OC192 – 9.6 gigabits per second (4 OC48s)

Recent sample of T1 price quotes

Full T1 (1.5 MB) $ 0 2 No $ 391
Local T1 (PRI) $ 0 2 n/a $ 380
Integrated T1 (24 Voice / 1.5 MB) $ 0 3 Yes $ 640
Metro Ethernet (10 MB) $ 0 3 Yes $ 950
Wireless T1 (6MB) $ 0 3 n/a $ 450
Bonded T1 $ 2099 3 Yes $ 799

Full Voice T1 $ 0 3 n/a $ 169

Latest News from the T1 industry.

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