Instruction manual
Glossary
025-9416 139
GLOSSARY
This glossary provides definitions of some industry-specific terms. Many of the glossary words
are defined loosely because they are used in a wide variety of applications. In addition, some of
the glossary words can be defined differently when they are out-of-context. These glossary defi-
nitions are meant to be applied only to the text of this and other related Zetron manuals.
Term Definition
ACK
A response from a TNPP paging encoder that a paging packet was
successfully received. The ACKnowledgment tells the sending node
that the packet need not be resent.
ACT LEDs
Four lights (one for each trunk) on the front of the paging terminal
that indicate trunk activity. The ACT LED lights when the trunk is
receiving digit feed or voice input.
AGC (Automatic Gain
Control)
A circuit feature designed to maintain constant signal output levels.
The AGC automatically and continuously modifies the amplification
of the varying input signal.
Alarm
A monitor of specific critical conditions at the site.
Alert
A method of notifying someone that a specific condition exists. A
page is an alert; it lets the subscriber know that someone is trying to
reach them.
Alphanumeric Paging
Display paging that combines alphabetic and numeric characters to
form a text message. An alphanumeric page can include symbols, such
as punctuation marks, depending on the paging format and terminal
software.
ANA PTT LED
A light on the front of the paging terminal that indicates the analog
push-to-talk is active. The ANA PTT LED lights when the radio
station is sending voice or tone audio.
ANS LED
Four lights (one for each trunk) on the front of the paging terminal
that indicate the trunk has been answered. The ANS LED lights when
trunk supervision between the telco CO and the Model 640 has been
initiated.
Answer Originate
Defines the handshaking protocol used for communication between
modems. When the answer originate mode is reversed, the modem
that initiates a call acts as though it were receiving a call. This hand-
shaking sequence “tricks” the other modem into thinking it initiated
the call. See also Handshaking.
The human equivalent of reverse answer originate would be calling
someone and starting the conversation with, “why did you call me?”