Instruction manual

Glossary
IROB protector
(In-Range Out-of-Building protector) Surge-protection
device for off-premises telephones at a location within
1000 feet (305 m) of cable distance from the control unit.
IS II/III
(Integrated Solution II or Integrated Solution III) Set of
UNIX System-based applications that augments and
provides additional services using the system.
ISDN
(Integrated Services Digital Network) 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 and
network interfaces ;
provides digital circuit-switched or packet-switched
connections within the network and to other networks for
national and international digital connectivity.
ISDN terminal
adapter
(Integrated Services Digital Network terminal adapter) A
device that connects the communications system with
data terminal equipment (DTE) ; for example, a data
module
or modem acting as data communications
equipment (DCE)
for a PC.
J
jack
Physical connection point to the system for a telephone,
trunk, or other device. Also called “
port.
”
K
kbps
(kilobits per second)
Key mode
One of three modes of system operation, in which the
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.
GL–12 System Manager's Guide