14
2.048Mb
p
s Wireless Modem
SALES: 0118 965 5100
ARQ – Based Error Correction
The 2.048Mbps Wireless Modem uses an Automatic Retransmission Queuing (ARQ)
mechanism to detect errors in received data and to request retransmission. The use of ARQ
results in a significant improvement in performance, overcoming problems caused by
interfering signals.
Radio
Full Duplex
The radio uses full duplex communication, transmitting and receiving simultaneously.
Spread spectrum Frequency Hopping
Using Spread Spectrum Frequency Hopping, a technique that changes the frequency of the
carrier over a hundred times per second, the radio “hops” in a pre-defined sequence through
up to 79 channels in the 2.4 - 2.5 GHz band. The number of channels and the frequency band
are determined by the specific model and relevant local regulations.
Frequency hopping provides reliable communication at low bit error rates as well as
increased bandwidth and interference avoidance.
Output Power
Radio power output is 16dBm (min.) at antenna port. Power emitted from antenna is up to
36dBm EIRP - US version, or 20 dBm EIRP – European version. In Low power mode, power
output is 2dBm.
Antennas
There is a variety of standard antennas and cable types for different gain levels.
Antenna Types
• Basic antenna - antenna gain of 8.5dBi.
• Medium gain antennas - antenna gain is either 12dBi or 18dBi.
• High gain antenna - antenna gain is 24dBi.
Cable Types
• Thin cable - this cable is thin and flexible, but its attenuation is relatively high.
• Thick cable - this cable is heavier and less flexible; its attenuation is lower.
• Low loss cable - this cable is thicker, heavier and more expensive, but its attenuation is very low.