User`s manual

CLARION M10 SERIES STRUCTURE
M10 SERIES USER’S MANUAL PAGE 12
2.3.6 SECURITY
Security is a great concern with any data transmission system. Security in
wireless data systems may be of even greater concern because of the
leakage of transmitter waveforms beyond the intended receiver sites. The
M10 offers excellent security without incorporating conventional
cryptography. Of course, the user always has the option to add
conventional data encryption technology to the most critical applications.
Most commercial spread spectrum manufacturers use fixed spreading codes
in their products. The M10 radio, with Direct Sequence Spread Spectrum
(DSSS), uses continuously changing, pseudo-random spreading codes, in
which each symbol is encoded with a different spreading code.
Furthermore, the user may select from 2
16
(64k) different sequences to
determine the order in which the spreading codes are used; this provides
excellent security against eavesdropping by unintended parties.
The sequences can be selected through configuration procedure provided by
the M10.
2.3.7 ANTENNA DIVERSITY
The M10 also offers additional robustness via the Antenna-selection
diversity upon re-transmission.
The M10 (models JX4000F-A and JX4000W-A) is equipped with an
internal antenna and an external antenna port for the attachment of your
FCC approved antenna for longer distance links. The external antenna port
uses a standard female SMA connector with Antenna Sense Circuit for use
with a FCC approved antenna. The user can purchase FCC approved
antennas kits from HyperLink (see section 8. Customer Assistance for
contact information).
If the user selects Enable of the diversity in the configuration setup, the
M10 selects the antenna for each transmission. The antenna used for the
transmission is memorized and used for the next transmission of a new
uploaded frame.