21
Cross Remote Technology
s
N Cable
er
n
th
ported
iver
nsmitter
usly.
etup
mission
wireless
her
dy,
Cross Remote uses 2.4 GHz band IEEE 802.15.4 communication technology that does not affect the band used
for digital wireless audio communication.
Cross Remote is a two-way communication system for transmitters and receivers that uses both UHF and 2.4
GHz frequencies to complement each technology’s strengths and advantages.
Advantages of 2.4 GHz (over using two-way UHF)
Two-way UHF would require a built-in receiver on the transmitter and would result in higher power
consumption, larger equipment size, and higher cost, making the implementation of this approach
impractical.
Because two-way UHF uses UHF channels for control, the number of channels that can be used
simultaneously is reduced. 2.4 GHz control on the other hand does not effect the number of channels
that can be used simultaneously.
Advantages of UHF (over using two-way 2.4 GHz)
UHF communication is always on. If an audio link is established, it will always reach the other party.
2.4 GHz on the other hand is not always on, in order to save power.
2.4 GHz uses common frequencies on a time sharing basis and connects only when needed.
The control signal (upstream) sends the same information to 82 units simultaneously, and status
information (downstream) can be divided into separate UHF streams.
In NT mode, up to 82 transmitters can be monitored and controlled together using RMU-01 units and
Wireless Studio. With 2.4 GHz, communicating with all 82 transmitters would take time. When using
UHF and 2.4 GHz, the combination of 2.4 GHz for upstream and UHF for downstream links results in a
communication system that realizes a smooth workflow.
IEEE 802.15.4 is a worldwide standard for close-range communication applications using the 2.4 GHz band.
Bands within the 2.4 GHz range are called ISM* bands and are widely used for microwave ovens, WiFi and
Bluetooth applications, as well as for data transmission in medical institutions and similar.
* Abbreviation of “Industrial, Scientific and Medical”. Frequency range allocated to wireless communication in these fields, requiring no
license to operate.
Notes
IEEE 802 is a set of network standards developed by the 802 committee of the IEEE (Institute of Electrical and
Electronics Engineers). It comprises the following standards:
802.11 Wireless
LANs
802.15
Wireless Personal Area Networks (WPANs)
802.15.1 Bluetooth
802.15.3 UWB
802.15.4 Wireless Sensor Network (PAN standard with low power consumption and low transfer rate)
Reference: About ZigBee
This is a short-range wireless communication standard for domestic appliances. It uses the physical layer
interface defined by the IEEE 802.15.4 and newly defines the network layer, security service provider, and
application layer. ZigBee is not identical with IEEE 802.15.4.
2.4 GHz IEEE 802.15.4 Technology
Why does Cross Remote use both UHF and 2.4 GHz frequencies?
IEEE802.15.4 standard
Technology
