Motorola MW 800 Series Vehicle Installation Manual page 48

42 MW 800 Vehicle Installation Guide
Radio Frequency Interference (RFI): 1) The Radio Frequency (RF) radiation which
leaks from a device when it is transmitting. 2) Electrical disruption (noise) created by certain
types of equipment that may be radiated through air.
RS-232: The most common, standard interface used to connect Data Terminal Equipment
(DTE) to modems. It uses a DB-25 connector, although the DB-9 version has become
popular on PCs which have limited space for connectors.
U
Ultra High Frequency (UHF): Radio frequency, extending from 300 MHz to 600 MHz.
Underwriter's Laboratories (UL): An independent and non-profit USA testing/
certification agency that was created by insurance companies to inspect electrical devices to
ensure there are no shock or fire hazards present.
Universal Serial Bus (USB): industry standard for PC bus interface enabling multi-drop
connection of both high-speed (12 Mb/s) and low-speed (1 Mb/s) serial port devices
V
Vehicular Radio Modem (VRM): VRM 650 or 850 - External radio modem integrated
with MCS2000 mobile radio into a single unit for use with separate MDT.