ADTRAN 810 Plus manual Leased line

Appendix E. Glossary

kbps

Kilobits per second. 1,000 bits per second.

LAN

local area network. Group of computers and peripheral devices connected by a communications chan- nel, limited by distance.

LCD

liquid crystal display. Alphanumeric characters that appear in a display area as a result of light reflect- ing off a special crystalline substance.

leased line

A telecommunication facility or link reserved for the exclusive use of one customer. Also called a ded- icated line.

local loop

In telephony the wire pair that connects a subscriber to a phone company end office, typically contain- ing two wires. Four-wire local loops are common, however, especially with leased voice grade circuits.

loopback

A diagnostic procedure where data is sent to the device being tested, and the output of the device is fed directly back to its input, looped around, and the returning data is checked against that which was sent.

LED

light emitting diode. Alphanumeric characters that glow when supplied with a specified voltage.

Mbps

Mega bits per second. A measure of the amount of information travelling across a network or commu- nications link.

MIB

management information base. The MIB is an index to the organized data stored within a network device.

Modem 16 Module

One of the ATLAS 800 option modules. The Modem 16 Module supports sixteen 56Kflex modem (ana- log) calls or sixteen ISDN connections.

multiplexer

(mux) A device that takes several low-speed channels and merges them into one high-speed channel at one end of a link. Another multiplexer at the other end of the link reverses this process.

NT1

Network termination 1. A unit that provides physical and electromagnetic termination of the U-inter- face, 2-wire transmission line; converts between Layer 1 formats used at the U- and T- reference points; and performs some maintenance functions.

nonvolatile memory

Any form of memory that retains its contents when power is removed (for example, ROM, EPROM, etc.)

E-4 ATLAS 810PLUS User Manual 61200266L1-1