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GLOSSARY
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©©
© RF Innovations Pty Ltd, 1998 Page: 96
234839, Revision 2.2
Digital Signal
A signal composed of discrete signal levels as opposed to the continuous signal levels of an analog signal.
DIP Switch
Acronym for Dual In-line Package. Options chosen by pushing a switch to one of two positions.
Distortion
Undesired change in a signal's original waveform resulting from the characteristics of the transmission circuits or other
external influences.
Downloading
Refers to the transferring of software from a remote system to your computer.
DTE
An acronym of Data Terminal Equipment. See Data Terminal Equipment.
Dual Port Control
The ability of the RFI-9256 modems to communicate out of both the Aux and Main ports to either the Aux or Main port of
the receiving modem.
Dumb Terminal
Terminals that do not contain an intelligent microprocessor and usually send data one character at a time.
Duplex Transmission
Independent, simultaneous, two-way transmission.
E
Echo
The re-transmission of characters received by either the modem or remote system back to the DTE.
EIRP
Effective Isotropic Radiated Power.
End Point Radio
Radios that are connected to the data device, such as SCADA/Acquisition/PC. As opposed to a repeater.
Escape Guard Time
The amount of time for which no activity is allowed on the data line before and after the sequence is entered, otherwise the
escape sequence will be ignored.
Even Parity
Even parity refers to the addition of a 0 value or 1 value bit to the data bits which form a character to cause an even number
of 1 value data bits to be sent. See also Parity.
Extension Numbe rs
The numbers that must be placed after the destination radio’s number, to access the required port (internal or external). Only
available in Point to Multipoint mode.
F
Fault Log
Contains a list of modem faults since the log was last cleared.
Firmware
Computer program stored permanently in Flash Memory.
Flash Memory
Non-volatile memory for storing programs and configuration data.
Flow Control
Controls the flow according to the readiness of the associated terminals to receive and transmit data. May be controlled with
hardware or software.