Trusted Wireless TM
The Trusted WirelessTM technology was specially developed for industrial applications by the Canadian company Omnex Control Systems. The technology which works in the license-free frequency bands 900 MHz and 2.4 GHz offers extremely high reliability and ruggedness. It continues to be characterized by high ranges, good interference and coexistence properties as well as very good diagnostic options.
Ruggedness and freedom of interference
The basis for Trusted WirelessTM wireless communication is a so-called frequency hopping
method (FHSS = frequency hopping spread spectrum). In such a method, wireless transmission is carried out over different, narrow-band wireless channels. Here, the transmitter and receiver continuously change the transmission/reception frequency.
The Trusted WirelessTM wireless technology can make use of up to 830 single frequencies, depending on the application, which are jumped to pseudo-randomly across the entire band (see figure below). With this, it achieves a high degree of freedom of interference and ruggedness.
Reliability and diagnostics
The reliability of Trusted WirelessTM wireless technology is further increased by special software mechanisms in the protocol. Also, Trusted WirelessTM wireless technology offers very good diagnostic options which can be made use of, depending on the product. The status of the wireless connection is diagnosed via the RF LINK signal.
The quality of the wireless path, on the other hand, can be precisely monitored by means of an analog RSSI signal (Receive Signal Strength Indicator). This signal can be constantly monitored on a system or only used for startup and aligning the antennas. The packet error rate and other parameters can be directly accessed, depending on the product.
Range
The Trusted WirelessTM wireless technology is optimized for medium-sized and long ranges. Can be achieved if suitable antennas are used and if the legal guidelines and the maximum values of the following distances are complied with:
In the 900 MHz band at 1W transmission capacity, typically 15 miles (= 25 kilometers)
In the 2.4 GHz band at 10/100mW, typically 3 kilometers.
These values can be exceeded or fallen short of, depending on the application.
You will find further properties and an exact explanation of Trusted WirelessTM technology in the White-Paper Trusted WirelessTM listed below.