2.4 GHz band wide-band low-power data communication system

2.4 GHz band wide-band low-power data communication system (Item 19 of Article 2-1)

Items	Technical standard
Assigned frequency or designated frequency	2,400-2,483.5MHz
Communication method	One-way communication, simplex, semi-duplex, or duplex operation of digital signal transmission including spread spectrum
Tolerance of frequency (×10-6)	50PPM
Tolerance of occupied bandwidth	FH : 83.5MHz FH + DS : 83.5MHz FH + OFDM : 83.5MHz OFDM , DS : 38MHz
Antenna power	Designated value (1) FH, FH+DS , FH+OFDM 3mW/MHz (used in the range of 2427 - 2470.75 MHz)     Occupied Bandwidth 38MHz: 5mW/MHz (2) OFDM , DS other than (1) 10mW/MHz (3) Other than (1) & (2) 10mW Tolerance +20%,-80%
Antenna gain	1) 2.14 dBi or less in principle 2) In case of directional antenna (1) FH, FH+DS or FH+OFDM using 2427-2470.75 MHz EIRP≦16.91 dBm/MHz (2) OFDM or DS other than (1) EIRP≦22.14 dBm/MHz (3) Other than (1) and (2): 22.14 dBm or less (4) Half-power angle of directional antenna (e) in case of the item 2):e ≦ 360/A (The A is 10 in maximum.)
Tolerance of spurious emission intensity	(1) Below 2387 MHz : 2.5μW (2) 2387 to 2400 MHz : 25μW (3) 2483.5 through 2496.5 MHz : 25μW (4) Over 2496.5 MHz : 2.5μW
Spreading bandwidth	DS,FH,FH+DS,FH+OFDM : 500kHz or more
Spreading rate of spectrum	For DS system;(Spreading bandwidth) / (Frequency corresponding to transmission rate) ≧5
Holding time of hopping frequency	FH , FH+DS , FH+OFDM : 0.4 sec or lees (The total sum of holding time at arbitrary frequencies within the time multiplied 0.4 sec by the spreading rate)
Limit of secondary radiated emissions	(1) Below 1 GHz : 4 nW (2) 1 GHz or higher : 20 nW
Interference prevention function	Shall have the function of automatic transmission and reception of identification sign.
Carrier Sensing function	Occupied Bandwidth 38MHz equipment only
Structure	Shall be of the structure that the RF and modulator sections excluding antenna cannot easily be opened.
Note	DS: Direct spread FH: Frequency hopping OFDM: Orthogonal frequency division multiplexing

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