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A.12.3 Wi-Fi Performance Specifications
• Do perform all network functions of data communication within an enclosed network.
A.12.3.1 System Capacity and Resistance to Wireless Interference
Meets the following requirements:
■ All the monitors do not encounter communication loss.
■ The total delay of data transmission from the monitor to the CMS: ≤ 2 seconds.
■ The delay for monitor-related settings configured at the CMS to be effective: ≤ 2 seconds.
■ The total delay of data transmission from one monitor to the other: ≤ 2 seconds.
■ The delay for the monitor to reset alarms of another to be effective: ≤ 2 seconds.
Testing conditions are as follows:
■ Number of the monitors supported by a single AP: ≤ 16.
■ Each monitor can communicate with the CMS.
■ Two monitors are used to view other monitors.
■ Only one monitor can transmit history data.
■ The weakest strength of the AP signal where the monitor is located is not less than -65 dBm.
■ The distance between the interfering devices and the monitor is greater than 20 cm. A Wi-Fi interference
(no greater than -85 dBm) in the same channel and a Wi-Fi interference (no greater than -50 dBm) in an
adjacent-channel are presented synchronously. The interfering devices include, but are not limited to, 2.4 G
wireless devices, cellular mobile networks, microwave ovens, interphones, cordless phones, and ESU
equipment. The interfering devices do not include Wi-Fi devices.
A.12.3.2 Wi-Fi Network Stability
The ratio of the communication data loss on the CMS from any monitor does not exceed 0.1% over a 24-hour
period. 12 of the 16 monitors connected to the network roam for 30 times.
Testing conditions are as follows:
■ Number of the monitors supported by a single AP: ≤ 16.
■ Each monitor can communicate with the CMS.
■ Two monitors are used to view other monitors.
■ Only one monitor can transmit history data.
■ The weakest strength of the AP signal where the monitor is located cannot be less than -65 dBm.
A.12.3.3 Distinct Vision Distance
The distinct vision distance between the monitor and the AP is no less than to 50 meters.
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