Instruction manual

Glossary
025-9416 147
Term Definition
Interference
Any noise source that impairs the communication link between two
pieces of equipment. Interference can affect telephone connections,
RF and µwave connections, and paging transmissions.
Initialization String
See Modem Initialization String.
Installation Interface
Assembly
An optional kit that simplifies the radio station and telco connections
to the Model 640. The option includes a terminal block adapter, 2
Wiedmueller connectors, wire wrap cabling, phone cabling, and
ferrites for noise protection. The terminal block adapter plugs directly
into the RJ21 on the rear of the paging terminal chassis to separate the
receive and transmit signals.
Jumper
A hardware connection between two electrical pins. A jumper is a
small plastic rectangle with metal pin holes in the center to conduct
electricity between the signals.
LED (Light Emitting
Diode)
A small round light that identifies portions of the paging terminal
operation. Most of the Model 640 LEDs are visible on the front panel
of the chassis. However, the optional TNPP interface card also has
several LEDs that can be observed by simply removing the top cover
of the terminal.
LINE LED
Four lights (one for each trunk) on the front of the paging terminal
that indicate trunk activity. The ACT LED lights whenever loop
current is present on the trunk.
Line Type
The signaling format used by the telco CO to connect the phone line.
The line type usually determines the number of signal leads used, their
functions, and the way a call is initiated. The most commonly used
types are E&M, end-to-end, and DID.
Link
A communication connection used to pass information to a remote
location or another piece of equipment. See ZLINK and RF Link.
Local Connection
A cable interface between two pieces of equipment that are located at
the same site. For example, a local connection can be between the
office computer and the paging terminal or the paging terminal and
the transmitter equipment.
Log Files
ASCII files that store virtually every detail about the paging terminal’s
activity. The log files are a useful diagnostic tool when troubleshoot-
ing malfunctions and failed pages. The Model 640 stores two log files.
Loop Start
A telephone signaling protocol that initiates a call upon connection of
the tip and ring leads (loop closed).
Main Processor
Motherboard
The circuitry in the Model 640 that performs traffic management for
all the page processing. The main processor controls paging terminal
timing, the PCM highway signals, voice prompt processing and
storage, and all of the system operating software.