MDS 05-2806A01, Rev. A MDS iNET 900 User’s Guide 117
Frequency Hopping—The spread spectrum technique used by the
MDS iNET 900 units, 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 fre-
quency to another.
Frequency Zone—The iNET uses up to 80 discrete channels in the 902
to 928 MHz spectrum. A group of 8 channels is referred to as a zone; in
total there are 10 zones.
Hardware Flow Control—An iNET feature used to prevent data buffer
overruns when handling high-speed data from the connected data com-
munications 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.
Hop Pattern (Seed)—A user-selectable value to be added to the hop
pattern formula in an unlikely event of nearly identical hop patterns of
two collocated or nearby iNET 900 networks. Changing the seed value
will minimize possible RF-signal collisions of iNET units. (This field is
only changeable on an Access Point. Remotes read the AP’s value upon
association.)
Host Computer—The computer installed at the master station site, that
controls the collection of data from one or more remote sites.
HTTP—Hyper Text Transfer Protocol
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 iNET 900’s CPU.
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 pur-
pose of gathering telemetry data. Figure 1-2 on page 5 shows an
example of an MAS system.
MAC—Media Access Controller
MCU—Microcontroller Unit. This is the processor responsible for con-
trolling system start-up, synthesizer loading, hop timing, and key-up
control.
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