ZETRON 640 DAPT XTRA, Installation And Repair Manual, Page: 156 / 210

Glossar
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Term Definition
DVM (Digital
Voltmeter)
A piece of test and repair equipment used to measure electrical power
in volts.
E (ear) Lead
The receive line of an E&M trunk.
E&M
A telephone line type that indicates seizure and supervision on two
separate wires. E and M refer to the two data wires - Ear (receive) and
Mouth (transmit).
Empty Message
A tone-only alert that is received by a pager. An empty message is sent
when the caller fails to key in a valid page and the EmptyMsg field is
set to ‘Y’ in the corresponding Pager Definition database.
Encoder
A converter used to create a message in a specific format.
End-to-End
A standard telephone line type like that available in a home. Also
referred to as a POTS (plain old telephone service) line.
ETB (End Of Text
Block)
An ASCII character that indicates the end of a TNPP packet text
block. If the packet only contains one text block, the ETB is not used.
The ETB is always followed by another text block. The last text block
in a packet is flagged with an ETX character.
ETX (End Of Text)
An ASCII character (
♥
) that indicates the end of the text in a TNPP
packet. Every TNPP packet should contain this character.
Exciter
The portion of the transmitter that creates the radio signals. The
exciter processes the paging data and sends it to the power amplifier
circuitry in the transmitter.
Extender Card
A circuit board designed to physically raise one of the Model 640
trunk cards up out of the chassis for pot adjustments. The extender
card plugs directly into the trunk card slot and then accepts the trunk
card on top of it.
Falsing
The erroneous activation of a decoding device as a result of mislead-
ing signals. Falsing in the paging world is when a pager alerts that
should not have.
FAULT Connector
A male 6-pin Wiedmueller connector on the rear panel of the Model
640 chassis. The fault interface indicates a paging terminal malfunc-
tion. This connector is usually interfaced to an alarm for applications
where paging terminal operation is critical (hospitals, emergency
response centers, etc.).
FCC
Federal Communications Commission. The U.S. government agency
that regulates non-governmental domestic communications systems.
Feed Digits
The DTMF signals sent to the paging equipment by the telco CO. The
feed usually ranges from three to seven digits. In the Model 640 Trunk
Valid Numbers database, the FeedDigits field identifies how many
digits the paging terminal should expect to receive on a given trunk.