PREPARATION FOR INSTALLATION
11
In order to avoid the Radio Frequency interference caused by Wi-Fi routers and Wi-Fi access points, the
EOS|HD Base Station offers three user selectable Hop Bands of radio operation. Making use of these
bands can assure that base communication is always free of interference.
Interference may be occurring if: you’re hearing clicks and/or pops; voices break up while talking;
you’re hearing a “Busy” prompt in headset when a button is pressed; the headset is ashing red lights;
you’re intermittently hearing “Lane 1” in the headset. To adjust this setting, refer to instructions in
Section 5.3.4.
3.3.1 Low Band
Using Low Band sets the frequency range in which the Base Station operates to the lower end of the
broadcast range. If you know that the Wi-Fi access point is set to Wi-Fi channel 11, then you should set
the base station to operate in ‘Low’ band so the base avoids the Wi-Fi channel 11 frequency range.
3.3.2 High Band
Using High Band sets the frequency range in which the Base Station operates to the upper end of the
broadcast range. If you know that the Wi-Fi access point is set to Wi-Fi channel 1, then you should set
the base station to operate in ‘High’ band so the base avoids the Wi-Fi channel 1 frequency range.
3.3.3 Full Band
When the EOS|HD is congured in Full Band, the Base uses the whole broadcast frequency range,
offering the greatest opportunity for headsets to communicate with the base.
However, when in Full Band, the base can be susceptible to interference from Wi-Fi routers and Wi-Fi
access points. In order to avoid this inference, the EOS|HD offers two other bands: High and Low.
3.3.4 Adaptive Frequency Hopping (AFH)
AFH stands for Adaptive Frequency Hopping. When the base is set in AFH Mode, the base operates in Full
Band. But rather than using the Full Band indiscriminately, the base will scan all frequencies currently
being used by other devices such as Wi-Fi.
Once it detects that some channels in Full Band are currently being used by other devices, it will exclude
those frequencies. By doing this, the base avoids interfering with these devices.
Since the AFH mode is constantly scanning and adapting to the RF environment, it is important to make
note of the following which may adversely affect performance in AFH mode:
h Extra transmissions or Wi-Fi access points may crowd the 2.4 GHz band to the point where
AFH may not be able to completely utilize unoccupied channels.
h The addition of remote antennas to a system to increase coverage area may reduce the benet
antenna redundancy. Since the system will search for occupied channels on both antennas, in
this conguration it may detect that more of them are occupied.
By default, AFH is enabled in the CE regulated countries. By default, AFH is disabled in all other
locations.
Hereby, HM Electronics, Inc., declares that EOS HD is in compliance with the essential requirements and
other relevant provisions of R&TTE Directive 1999/5/EC. In AFH mode, EOS HD complies with European
Telecommunications Standards Institute (ETSI) harmonized European standard EN 300 328. Dealers,
Distributors or Installers operating in a CE regulated country that switch off or disable AFH will render
the product non-compliant with the directive and will be considered the manufacturer of the product.
CE BASE STATION ADAPTIVE FREQUENCY HOPPING
Background
The HME EOS HD wireless system utilizes a Frequency Hopping Spread Spectrum (FHSS) radio in
order to provide robust communications. This system operates in the unlicensed 2.4 GHz band. With
the proliferation of other devices over the past few years in the same 2.4 GHz band, instances where
these devices and systems can interfere with each other has greatly increased. The European Union has
updated the radio standards for equipment operating in this band in an attempt to reduce interference
between equipment from different manufacturers. This European Telecommunications Standards
Institute (ETSI) harmonized European standard is known as EN 300 328.
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