GE GFK-2489 - Manual (Page 180)

GFK-2489 Chapter 9 Terms and Abbreviations 9-3
9
Frame—A segment of data that adheres to a specific data protocol and contains definite start
and end points. It provides a method of synchronizing transmissions.
Frequency Hopping—The spread spectrum technique used by the transceivers, where two
or more associated radios change their operating frequencies several times per second using
a set pattern. Since the pattern appears to jump around, it is said to “hop” from one frequency
to another.
Frequency Zone—A segment of radio spectrum containing the transmitters lower and upper
frequency limits.
Hardware Flow Control—A transceiver feature used to prevent data buffer overruns when
handling high-speed data from the connected data communications device. When the buffer
approaches overflow, the radio drops the clear-to-send (CTS) line, that instructs the
connected device to delay further transmission until CTS again returns to the high state.
Host Computer—The computer installed at the master station site, that controls the
collection of data from one or more remote sites.
HTTP—Hypertext Transfer Protocol
IAPP—Inter-Access Point Protocol. A protocol by which APs share information between the
Remotes that are connected to them. This allows relevant data to travel across commonly-
connected radio subnet-works from outlying Remotes to other outlying Remotes.
ICMP—Internet Control Message Protocol
IEEE—Institute of Electrical and Electronic Engineers
Image (File)—Data file that contains the operating system and other essential resources for
the basic operation of the transceiver CPU.
Intergap See Inter-Packet Delay
Inter-Packet Delay—A technique used in devices to accommodate protocols that do not
tolerate gaps in the middle of a frame (for example, MODBUS ASCII). In these protocols,
gaps are interpreted by the connected device as an end-of-frame indication, which may cause
errors. Inter-packet delay resolves this through the use of buffers.
kbps—kilobits per second. See bps.
LAN—Local Area Network
Latency—The delay (usually expressed in milliseconds) between when data is applied at the
transmit port at one radio, until it appears at the receive port at the other radio.
MAS—Multiple Address System. A radio system where a central master station
communicates with several remote stations for the purpose of gathering telemetry data.