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Glossary
N
network
Configuration of communications devices and software
connected for information interchange.
network interface
Hardware, software, or both that links two systems in an
interconnected group of systems, for example, between
the local telephone company and a PBX.
0
off-hook
off-premises
telephone
ones density
on-hook
OPT
OPX
Telephone is said to be off-hook when the user has lifted
the handset, pressed the
Speaker
button to turn on the
speakerphone, or used a headset to connect to the
communications system or the telephone network.
See OPT.
Requirement for channelized DS1 service to the public
network that eight consecutive zeros cannot occur in a
digital data stream.
Telephone is said to be on-hook when the handset is hung
up, the speakerphone is turned off, and the user is not
using a headset to connect to the communications system
or the telephone network.
(off-premises telephone) Single-line telephone or other
tip/ring device connected to the system by an 008 OPT
module in the control unit. Appears as an inside extension
to the system, but may be physically located away from
the system.
(off-premises extension)
GL–24 Maintenance and Troubleshooting