Specifications

R4-11-4G Glossary 9
R
Radio Data-Link Access Procedure: (RD-LAP) An RF protocol used
for communication between user devices and the DBSs. RD-LAP provides a
raw data transfer rate of 19.2 kbps on 25 kHz radio channels and 9.6 kbps on
12.5-kHz radio channels.
Radio Frequency: (RF) Refers to the electromagnetic energy
wavelengths between the audio and light range frequencies (usually
somewhere between 10 kHz and 300 gHz).
Radio Interface Box: (RIB) The RIB is a hardware interface between the
station and the computer’s serial port.
Radio Network Controller 3000: (RNC3000 or RNC) The RNC
manages the data messaging and provides the data communication interface
between the RF networks and the host computer network.
Radio Service Software: (RSS) An RF diagnostic and adjustment
utility.
Random Access Memory: (RAM) An integrated circuit memory chip
that allows information to be stored and retrieved by a microprocessor or
controller.The information can be stored or accessed in any order, and all
storage locations are equally accessible.
Read-Only Memory: (ROM) Memory device, usually semiconductor, in
which the contents are defined during manufacture. The stored information
can be read, but not changed once it is programmed.
redundancy: The use of redundant components needed for back-up in
case of failure from the main components.
RJ-11: A standard 4-wire (2 pair) telephone jack/connector. RJ-11 is used
on most single-line telephones.
RJ-45: Standard 8-wire (4-pr.) jack/connector. It is used as a low-cost
alternative to standard twisted-pair cabling when connecting low-speed
devices.The wire may be twisted or flat though flat will only work up to 19.2
kbps. Used with 10BaseT ethernet devices.
RS-232: The most common, standard interface used to connect DTEs to
modems. It uses a DB-25 connector, although the DB-9 version has become
popular on PCs with limited space for connectors.
S
Simple Network Management Protocol: (SNMP) The application
protocol in an IP suite used to send and retrieve management-related
information across an IP network.