Posted by Ron Tozaki, February 4, 2014
Understanding Wireless Regulations in China
Prior to 2013, the Wi-Fi airwaves were getting clogged in China as the 5GHz band was confined to 5725-5850 MHz. To solve this issue, China opened up the 5GHz band to add the 5150-5350 MHz frequencies to create more breathing space and a less congested Wi-Fi environment. Some of the changes are as follows:
- Increased the number of 20 MHz channels from 5 to 13
- Increased the number of 40 MHz channels from 2 to 6
- Maximum power output is 200 mW EIRP
Maximum PSD (Power Spectral Density): 10 dBm/MHz (EIRP)
Out-of-band emission: -80 dBm/Hz (EIRP)
- 5250 to 5350 MHz band is subject to Dynamic Frequency Selection (DFS) and Transmit Power Control requirements
Wi-Fi Channels Summary:
- 2.4 GHz: Channels 1 – 13.
- 5 GHz:
|5150-5250 MHz||20 MHz||Channels 36, 40, 44, 48|
|40 MHz||Channels 38, 46|
|5250-5350 MHz||20 MHz||Channels 52, 56, 60, 64|
|40 MHz||Channels 54, 62|
|5725-5850 MHz||20 MHz||Channels 149, 153, 157, 161, 165|
|40 MHz||Channels 151, 159|
|80 MHz||Channel 155 (for 802.11ac)|
Considerations when dealing with wireless regulations in China
China does not accept modular certification of 802.11 Wi-Fi radio modules. System approval is required to obtain the China Compulsory Certification (CCC). In addition, the radio must also obtain State Radio Regulation Committee (SRRC) Radio Type Approval, with in-country testing required.
China Safety Update
There is a new requirement for power supplies sold in China. China standard GB 4943.1-2011 went into effect December 01, 2012 and requires warning labels for power supplies that do not meet creepage clearance from the primary-to-secondary circuitry. This applies to units used above 2,000 meters due to sparking danger in higher altitudes where the air is thinner and less humid. This standard may become a worldwide standard in the future as most power supplies are manufactured in China.
If your system is not capable of running the various Wi-Fi radio tests, like continuous transmit, then in most cases it is possible to demonstrate compliance using a third-party development platform. Silex Technology can help with this radio testing. Please contact firstname.lastname@example.org to obtain more information.