F15 Series Fetal & Maternal Monitor User Manual WI-FI Networking and Instructions
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Instruction:
WiFi has a total of 14 channels, as shown in the figure above: IEEE 802.11b/g standard works in 2.4G
frequency band, frequency range is 2.400-2.4835GHz. A total 83.5M bandwidth is divided into 14
sub-channels, and each sub-channel width is 22MHz. The center frequency of adjacent channels is
5MHz apart, and adjacent channels have overlapping frequencies. For example, channel 1 and
channel 2, 3, 4, 5 have frequency overlap, only 3 channels (1, 6, 11) in the entire frequency band don’t
interfere with each other. According to the above figure, it can be seen very intuitively that the required
co-channel frequency interference and adjacent frequency interference are defined. For example, AP
works on channel 6, only APs of channel 1, 11, 12, 13, 14 do not interfere with the data transmission of
F15, other channels more or less will interfere, especially channel 6 is same frequency, and it should
be guaranteed that the co-channel interference on the channel must be less than -20dB, for other
adjacent channels 2, 3, 4, 5, 7, 8, 9, 10, interference must be less than 15dB.
Wireless transducer network acceptance criteria:
1． For the coverage of the wireless transducer and monitor, i.e., the range of use, the signal
strength of the test point is required to be >-65dBm. The selection of the test point needs to
cover signal strength test on the abdomen of the stimulated user (i.e.customer service
engineer) during sitting, lateral position and lying, at the same time, the co-channel
interference and adjacent frequency interference should be tested.
2． PING testing every monitor and transducer in the whole set of system, average delay and
jitter should meet the requirements.
The sample test is as follows:
Step 1: Scan the signal strength of the AP in the environment:
Traditional 510(k) of Fetal & Maternal Monitor
014_14.1_F15_Series_User_Manual
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