T1
Type of broadband telecommunications connection (see broadband technology) used especially to connect Internet service providers to the Internet's infrastructure. Developed by Bell Labs in the 1960s, the “T-carrier systems” offer entirely digital, full-duplex exchange of data over traditional wire, coaxial cable, optical fibre, microwave relay, or other communications media. The T1 lines carry about 1.5 megabits of data per second, while the related T3 lines carry over 40. However, such systems are generally too expensive for individual network users, who turn instead to ISDN lines, cable modems, DSL connections, or some form of wireless or satellite system for high-speed Internet access.
T1
(1) A 1.544 Mbps point-to-point, dedicated, digital circuit provided by the telephone companies. With the monthly cost typically based on distance, T1 lines are widely used for connecting an organization's PBX to the telephone company or a local network (LAN) to an Internet provider (ISP).
T1 lines were also widely used for connecting branch offices, but many have been supplanted by virtual private networks (VPNs) over the Internet.
They Started in the 1960s
The first T1 line was tariffed by AT&T in January 1983. However, in the early 1960s, AT&T started the move to digital transmission, and T1 lines were deployed in intercity trunks to improve signal quality and make more efficient use of the network.
T1 Anatomy
A T1 line uses two wire pairs (one for transmit, one for receive) and time division multiplexing (TDM) to interleave 24 64-Kbps voice or data channels. The standard T1 frame is 193 bits long, which holds 24 8-bit voice samples and one synchronization bit with 8,000 frames transmitted per second. T1 is not restricted to digital voice or to 64 Kbps data streams. Channels may be combined and the total 1.544 Mbps capacity can be broken up as required. See DS, T-carrier, bipolar transmission, D4 and ESF.
(2) See Type 1 font.
64 Kbps
T-Carrier Total Speed Channels
T1 1.544 Mbps 24
T2 6.312 Mbps 96
T3 44.736 Mbps 672
| (communications) | T1 - An AT&T term for a digital carrier
facility used to transmit a DS1 formatted digital signal at
1.544 megabits per second.
T1 transmission uses a bipolar Return To Zero alternate mark inversion line coding scheme to keep the DC carrier
component from saturating the line.
Although some consider T1 signaling obsolete, much equipment
operates at the "T1 rate" and such signals are either
combined for transmission via faster circuits, or
demultiplexed into 64 kilobit per second circuits for
distribution to individual subscribers.
T1 signals can be transported on unshielded twisted pair
telephone lines. The transmitted signal consists of pips of a
few hundred nanoseconds width, each inverted with respect to
the one preceding. At the sending end the signal is 1 volt,
and as received, greater than 0.01 volts. This requires
repeaters about every 6000 feet.
The information is contained in the timing of the signals, not
the polarity. When a long sequence of bits in the transmitted
information would cause no pip to be sent, "bit stuffing" is
used so the receiving apparatus will not lose track of the
sending clock.
A T1 circuit requires two twisted pair lines, one for each
direction. Some newer equipment uses the two lines at half
the T1 rate and in full-duplex mode; the sent and received
signals are separated at each end by components collectively
called a "hybrid". Although this technique requires more
sophisticated equipment and lowers the line length, an
advantage is that half the sent and half the received
information is mixed on any one line, making low-tech wiretaps
less a threat.
See also Integrated Services Digital Network. | |