SRRC Filing Timelines for a Product Entering China
SRRC radio type approval in China takes 8 to 16 weeks, requiring local agent representation, strict customs sample clearing, and accredited domestic lab scans.
Dynamic Frequency Selection Testing
Meaning
Evaluation of a device’s ability to identify and avoid restricted radar frequencies ensures that wireless networks do not interfere with weather or military equipment. This dynamic frequency selection testing proves that a smart module can detect specific electromagnetic pulses and automatically move to a clear channel within milliseconds. Systems operating in the five gigahertz band typically undergo this process to verify radar avoidance algorithms are functional.
It determines the effectiveness of the channel evacuation logic under various interference scenarios.
Pulse Detection
Simulators generate artificial radar signals that match the timing and frequency characteristics of real terrestrial or maritime radar units. During dynamic frequency selection testing, the test equipment monitors how long the device takes to stop transmitting after a valid pulse arrives. Threshold levels ensure that modules detect even low-power signals at the edge of the range.
The hardware must distinguish between random high-frequency noise and actual systematic radar signatures.
Channel Management
Software logic must initiate a channel move without human intervention once the identification occurs. Results from dynamic frequency selection testing define the non-occupancy period, which is the time a radio must stay off a channel after a radar hit. If the module returns too early, it risks disrupting critical navigational data.
Standard delays typically last thirty minutes before a blocked frequency returns to the available pool.
Performance Target
Regulatory approval requires a zero percent failure rate in identification during the evaluation sequence. The dynamic frequency selection testing sequence covers multiple radar patterns including frequency hopping and short pulse bursts. If a module cannot detect the required percentage of signals, it must restrict its operation to bands outside the shared radar frequencies.
Detailed event logs capture the transition sequence for every test iteration.