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Used frequencies
Cross Remote selects the optimal frequency for communication based on the system and the environment.
If interference is detected on a currently used frequency, the system automatically switches to another
frequency and continues communication. This assures stable operation even under congested 2.4 GHz
conditions.
Cross Remote frequency bands
IEEE 802.15.4 comprises the following specifications, but because of RF regulations, only the 2.4 GHz band can
be used worldwide.
868 MHz (BPSK, 20 kbps)
915 MHz (BPSK, 40 kbps)
2.4 GHz (O-QPSK, 250 kbps)
Cross Remote uses the 2.4 GHz band to allow identical specifications for all global regions.
The 2.4 GHz band comprises 16 channels spaced at 5 MHz, from 2.405 GHz (channel 11) to 2.480 GHz
(channel 26).
Out of these, Cross Remote uses the following frequencies.
ST mode: 2.405 GHz (11ch), 2.425 GHz (15ch), 2.450 GHz (20ch), 2.475 GHz (25ch)
NT mode: 2.420 GHz (14ch), 2.445 GHz (19ch), 2.470 GHz (24ch)
Wireless LAN and channel allocation
Channels 1, 6, and 11 are commonly used for wireless LANs.
Conditions for frequency switching
Channels are switched when the following conditions occur:
Channel switching does not necessarily occur for all types of interference.
Ch.5
Ch.4
Ch.3
Ch.2
Ch.1
22 MHz
5 MHz
2 MHz
11
12
13
14
15
NT
ST
A wireless LAN starts to operate on the currently selected channel and remote control communication is
no longer possible.
Interference is detected at the receiver. The network is reconfigured.
A reset is performed, and the system starts scanning for an empty channel.
When a channel is found, the system waits for transmitter reconnection.
When the connection is interrupted, the transmitter scans all channels and looks for a reconnection
target.
When the paired equipment is found on another channel, the reconnection process is initiated.
Note
Short, sporadic interference cannot be avoided by this technique .
Channel switching is effective for prolonged interference caused by streaming or similar operations on
the wireless LAN.
The receiver controls whether channel switching is performed. Even if subject to interference, the
transmitter does not initiate channel switching.
2.400 GHz – 2.4835 GHz
Ch.10
Ch.9
Ch.8
Ch.7
Ch.6
25 MHz
16
17
18
19
20
21
NT
ST
Ch.13
Ch.12
Ch.11
Wireless LAN
22
23
24
25
26
IEEE802.15.4
NT
ST
Cross Remote Technology
23
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