Instruction manual

GLOSSARY
Loop Start Trunk
After establishing a connection with the distant switching system for an outgoing call,
System 25 waits for a short period of time before sending the digits of the called number.
On incoming calls, the received request for service is sufficient to cause the call to route to
a predetermined destination, normally the system attendant group. No digits are received.
MET: (Multibutton Electronic Telephone)
Misframe
Frame in which framing bits where observed to be in error.
Modem
A device that modulates and demodulates signals transmitted over a communications path.
Used to connect Data Terminal Equipment to the system’s analog ports. The system
provides a pooled modem conversion resource(12 resources maximum per system—212A
compatible).
Modem Pooling
Provides shared-use conversion resources that eliminate the need for a dedicated modem
when an analog data end point accesses, or is accessed by, an analog line or trunk.
Multiline Voice Terminal
A terminal equipped with several call appearance buttons for the same extension number.
Allows the user to handle more than one call, on that same extension number, at the same
time.
Multiplexed
The simultaneous transmission of two or more signals over a common transmission
medium.
NPA: (Number Plan Area)
NANP: (North American Numbering Plan)
Network
An arrangement of inter- and/or intra-location circuits designed to perform specific
functions.
Network Interface
Provided by the CO telephone company in two forms: (1) RJ21X for trunk facilities other
than tie trunks. (2) RJ2GX for tie trunk facilities.
9-10
November 1995