AT&T MERLIN LEGEND Release 3.0 System Programming Manual page 801

Glossary
O
off-hook
off-premises
telephone
ones density
on-hook
OPT
OPX
out-of-band
signaling
P
parity
Passageway
Solution
pass-through
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 through 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
Signaling that uses the same path as voice-frequency
transmission and in which the signaling is outside the
band used for voice frequencies.
The addition of a bit to a bit string so that the total number
of ones is odd or even, used to detect and correct
transmission errors.
Set of four software applications to provide an interface
between a personal computer and the system: cardfile,
telephone programming application, call log and viewer,
and applications manager.
Connection from an internal modern to a programming
jack on the system.
GL–19
System Programming