AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual page 212

Glossary
Music-on-Hold (MOH)
Magic on Hold or a customer-provided music source connected to the
communications system via a loop-start (LS) jack. Most MOH equipment is
designed for LS operation.
Note: If you use equipment that rebroadcasts music or other copyrighted
materials, you may be required to obtain a copyright license from and pay
fees to a third party such as the American Society of Composers, Artists, and
Producers (ASCAP) or Broadcast Music Incorporated (BMI). Or you can
purchase a Magic on Hold system, which does not require such a license,
from your technical support organization.
network
A configuration of communications devices and software connected for
information interchange.
network interface
Hardware, software, or both that links
of systems, for example, between the
off-premises telephone
A telephone located in a building other than where the control unit is located.
OPT
off-premises telephone
OPX
off-premises extension
parity
The addition of a bit to a bit string so that the total number of 1's is odd or
even. Parity can be used to detect and correct transmission errors.
pass through
A connection from an internal modem to a programming port on the
communications system.
PBX
private branch exchange
PFT
power failure transfer
personal line
A central office (CO) line that rings only at the user's telephone.
GL-10 Glossary
two systems in an interconnected group
local telephone company and a PBX.