MDS 05-4055A01, Rev. A
MDS entraNET 900 System Guide (Preliminary)
135
versed process is applied at the other end of the network extracting the
data from the IP envelope, resulting in the original packet in the original
protocol.
Endpoint—IP address of data equipment connected to the ports of the
radio.
Equalization—The process of reducing the effects of amplitude, fre-
quency or phase distortion with compensating networks.
Fade Margin—The greatest tolerable reduction in average received
signal strength that will be anticipated under most conditions. Provides
an allowance for reduced signal strength due to multipath, slight antenna
movement or changing atmospheric losses. A fade margin of 15 to 20
dB is usually sufficient in most systems.
Frame—A segment of data that adheres to a specific data protocol and
contains definite start and end points. It provides a method of synchro-
nizing transmissions.
Frequency Hopping—The spread spectrum technique used by the
transceivers, where two or more associated radios change their oper-
ating 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—The transceiver 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 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.
Hop Pattern Seed—A user-selectable value to be added to the hop pat-
tern formula in an unlikely event of nearly identical hop patterns of two
co-located or nearby networks to eliminate adjacent-network interfer-
ence.
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 access
points share information about the stations that are connected to them.
When a station connects to an access point, the access point updates its
database. When a station leaves one access point and roams to another
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