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Technology
System configuration
Why was IEEE802.15.4 adopted?
Among alternatives such as 2.4 GHz wireless LAN, Bluetooth, and UWB, Cross Remote has chosen IEEE 802.15.4
for the following reasons.
Very low power consumption avoids degradation of battery life for the main communication link.
Very fast wakeup from sleep state. Intermittent operation further contributes to power savings, while posing
no inconvenience for users.
Communication speed and range are suitable for control requirements.
In addition to point-to-point communications, network can be expanded, allowing control of multiple
transmitters from multiple computers.
Cross Remote uses the physical layer and MAC layer specified by IEEE 802.15.4, and defines the application
layer according to the requirements of convenient on-site use.
Notes
Why RF wireless rather than infrared?
Whereas infrared wireless becomes unusable when there are screens or other obstacles, RF wireless allows
remote control of a transmitter even when worn under clothing.
Why 2.4 GHz band?
Among the frequencies covered by IEEE 802.15.4, namely 868 MHz, 915 MHz, and 2.4 GHz, the 2.4 GHz band
was chosen because it allows worldwide use. It is suitable as a common platform for devices to be used
globally.
22
Cross Remote Technology
Application Layer:
Defines the protocols for user interaction
APL Layer
on the network
(pairing and address allocation).
Media Access Layer:
Defines the specifications for device
MAC Layer
interaction on the network
(error correction, ACK, resend request etc.).
Physical Layer:
Defines the wireless principles for the network
PHY Layer
(frequency, modulation principle etc.)
Follows RF standards for various countries.
Cross Remote defines APL layer.
Determines the network configuration and pairing
method, roaming principles, and protocols.
ST mode/NT mode switching is also performed here.
(Note: ZigBee also defines these specifications.)
The MAC layer and PHY layer are defined
by IEEE 802.15.4.
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