User's Manual

Page 177
is spread over a broad RF band through the continual frequency “hopping”. Also see
Full-D
A type of two-way communication in which both stations can send and receive
uplex
ding the other unit can
tially uses half-duplex transmission techniques but simulates
).
uplex.
ission
,
is the packet
n mode, therefore communication is possible with the modems in the
Multi-
frequency from a defined group of
Broadc
in which one FRH modem transmits the same message to multiple
neously.
Multip
F signal from multiple paths such as
nna-to-antenna signal and reception of a secondary signal
o
Packet
y data assembled in a specific way for transmission. It
tion
Packet
of
Direct Sequence and Spread Spectrum.
uplex
signals or data at the same time. A telephone is an example of a full-duplex
communication device. Also see Half-Duplex.
Half-D
A type of two-way communication in which both stations can send and receive
signals or data but not at the same time. When one unit is sen
ple of a half-duplex communication device. The only receive. A CB radio is an exam
FRH-SD07TU/TB essen
full-duplex communication by causing both units to switch very rapidly between
transmit and receive modes. This is also referred to as Time-Division-Duplex (TDD
Also see Full-D
Headerless Packet Transmission Mode
The headerless packet transmission mode is a special mode of the packet transm
mode, where data are directly input with no transmission command, as a header
required in the packet transmission mode. Basically, this mode
transmissio
packet transmission mode. Due to its high data transparency, the application software
is quite simple or unnecessary. Suitable for the multi-terminal communication.
access
Automatic selection of an idle or clear FRH
frequencies.
ast/Multicast
This is a mode
receiving FRH modems simulta
ath (Fading)
Multipath refers to the reception of the same R
reception of the direct ante
reflected from surrounding structures. This phenomena can cause signal fading due t
interference between the RF signals arriving from multiple paths.
A finite bundle of binar
consists of the data to be transmitted and certain control information such as
destination and origination address, packet length, synchronizing bits, error detec
and correction bits, etc.
Transmission Mode
The FRH-SD07TU/TB can use one of two primary modes: data transparent mode
and packet transmission mode. In packet transmission mode, fixed length segments
data, consisting of information data and other control data, are assembled and
Futaba Corporation Rev. 020323-01