AT&T 7200 series, 7500 series, 7100 series Keyboard dialing Kilo bits per second kbps, LAN Lapd

GLOSSARY GL-15

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Integrated Services Digital Network (ISDN)

Integrated Services Digital Network basic rate interface (ISDN-BRI)

Integrated Services Digital Network primary rate interface (ISDN-PRI)

interface

intermediate high-usage trunk group

ISDN

keyboard dialing

kilo bits per second (kbps)

LAN

LAPD

LED (light-emitting diode)

link

link-access procedure on the D-channel (LAPD)

A public or private network that provides end-to-end digital connectivity for all services to which users have access by a limited set of standard multipurpose user-network interfaces defined by the CCITT. Through internationally accepted standard interfaces, ISDN provides digital circuit-switched or packet-switched connectivity within the network and links to other ISDNs to provide national and international digital connectivity.

See basic rate interface.

See primary rate interface.

A common boundary between two systems or pieces of equipment.

A high-usage trunk group that receives overflow traffic from other trunks and may receive first-route call traffic and/or switched overflow call traffic.

See Integrated Services Digital Network.

See terminal dialing.

1000 bits per second.

See local area network.

See link-access procedure on the D-channel.

A semiconductor device that produces light when voltage is applied. LEDs provide a visual indication of the operational status of hardware components, the results of maintenance tests, and the alarm status of circuit packs, and the activation of telephone features.

A transmitter-receiver channel or system that connects two locations.

A link-layer protocol on the Integrated Services Digital Network basic rate interface (ISDN-BRI) and primary rate interface (ISDN-PRI) data-link layer (level 2). LAPD provides data transfer between two devices, and error and flow control on multiple logical links. LAPD is used for signaling and low-speed packet data (X.25 and mode 3) on the signaling (D-) channel and for mode-3 data communications on a bearer (B-) channel.