Instruction manual

Glossary
025-9416 145
Term Definition
Ferrite
A metal casing designed to block RF noise interference from the radio
station equipment. Six ferrites are included in the installation interface
assembly option to protect each of the telco trunk and the radio station
connectors.
Field
A parameter in the Model 640 database that requires a formatted entry.
Each database record is made up of one or more fields.
Field-Upgrade
A modification to the paging terminal equipment that is performed by
a technician at the site. Field-upgrades are any changes that are not
made at the Zetron factory, prior to shipment.
Flying Leads
The ends of any cable that does not have a standard connector (phone
plug, Wiedmueller, DB-9, etc.) attached to it. The flying leads are
each of the separate signal leads that are available for termination.
Foreign Exchange
(FX)
A telco service provider for compact communities distant from the
local exchange. A foreign exchange service is usually provided at
reduced costs compared to a regular long-distance carrier.
Foreign Key (FK)
A database field that points to another database record located else-
where. A foreign key field must identify another record that has been
previously created in the system. This structure effectively creates a
“nesting” structure where a record contains more data than it first
appears to.
Frequency
An alternating current (AC) signal’s cycles per second (Hz).
Frequency Shift
Keying (FSK)
A method of translating analog modem tones into usable digital data
for the transmitter.
Function Code
A variable entry that indicates a specific set of operating parameters
for a pager. The function codes available are determined by the pager
format (Golay, 2-tone, etc.) and model. Function codes usually corre-
spond to operations such as paging types (voice, tone, numeric, alpha-
numeric, etc.), the number of display characters, and the number and
type of signal alerts (beeps, tones, etc.).
Function Tones
PURC tones that indicate the mode (analog or digital) that the trans-
mitter should key up in. Function tones indicate the end of the key up
sequence from the radio station.
5/6-tone
An analog pager format based on the 2-tone format. The 5/6-tone
format supports tone and voice paging and battery saver operation like
2-tone. However, the 5/6-tone format increases the number of avail-
able pagers in a system significantly, while cutting transmission time.
Gap Time
The space between transmission of the first and second alert tones for
a 2-tone pager. The gap time allows the pager a chance to accurately
identify the addressing information. Other gap times are used during
transmissions between mode (analog and digital) changes.