AT&T DEFINITY 2500 series Network Manual page 327

_ ______________________________________________________________________________________
_ ______________________________________________________________________________________
_ ______________________________________________________________________________________
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.
GL-15
GLOSSARY