AT&T MERLIN LEGEND System Reference Manual page 638

Glossary
N
network
A 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.
O
off-premises telephone
A telephone located in a building other than where the control unit is located.
ones density
The requirement for channelized DSI service to the public network that eight consecutive zeros cannot be in a digital data
stream.
outcalling
A feature of the MERLIN MAIL Voice Messaging System application. When outcalling is activated, the user is automatically
called by the system at a programmed number when a new message is received in his or her mailbox.
Out-of-band Signaling
Signaling that uses the same path as voice-frequency transmission and in which the signaling is outside the band used for
voice frequencies.
P
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.
personal line
A central office (CO) line that rings only at the use's telephone.
pool
On a Hybrid/PBX system, a grouping of outside trunks that users can choose with multiple pool buttons or by dialing access
codes on an SA (System Access) button on the telephone. Pools are also used by the Automatic Route Selection (ARS)
feature to choose the cheapest method to route a call.
port
A point of access into a communications system, computer, network, or other electronic device.
power supply module
A device that directs electricity to modules and telephones on the communications system. One power supply module is
needed for each carrier, and an auxiliary power unit is added if the module exceeds capacity.
Glossary GL-11