Instruction manual

Glossary
IROB protector (In-Range Out-of-Building protector) A surge protection
device for off-premises telephones at a location within
1000 feet (305 m) of cable distance from the
communications system control unit.
IS II/III
ISDN
(Integrated Solution II or Integrated Solution III) A suite of
UNIX system-based applications that augments and
provides additional services for voice and data
communications using the communications system.
(Integrated Services Digital Network) 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 International Telegraph and Telephone Consultative
Committee (CCITT). Through these internationally accepted
standard interfaces, ISDN provides digital circuit-switched
or packet-switched connections within the network and to
other networks to provide national and international digital
connectivity.
ISDN 7500B A data communications device that allows connection
Data Module
between an RS-232 DTE device and the communications
system control unit via MLX station jacks on the 008 MLX or
408 GS/LS-MLX module. The ISDN 7500B Data Module is
used together with a modem pool to change digital data
signals to analog signals and vice versa, which allows
transmission between digital and analog data stations.
jack
kbps
Key mode
LED
A physical connection point to the communications system
for a telephone, trunk, or other device. Also called port.
Kilobits per second.
One of three modes of system operation, in which the
communications system uses Personal Lines on line buttons
for outside calls, with a separate interface (ICOM buttons)
for internal calling. See also Behind Switch mode and
Hybrid/PBX mode.
(Light-emitting diode) A semiconductor device that
produces light when voltage is applied. LEDs show the
operational status of hardware components, the results of
maintenance tests, the alarm status of circuit packs, and
the activation of telephone features.
line and trunk The assignment of lines and trunks connected to the
assignment
communications system control unit to specific buttons on
each telephone.
line coding The pattern data assumes as it is transmitted over a
communications channel.
GL-14 Glossary