What is the benefit if we reduce number of SSID
Is it good idea to keep external antenna in high ceiling
By lowering the number of SSIDs you are broadcasting you can reduce the amount of airtime used up by beacons. This depends on your minimum data rates, the number of SSIDs, and the number of radios on the same channel.
Revolution wifi blog as a great excel calculator which you can use to find out how much overhead your network configuration will result in.
As for antenna being high in ceiling, it really depends on the AP and antenna you are using. Its hard to answer without seeing floor plans and knowing more about your environment and infrastructure. Typically keeping AP/Antenna above the users is best as it results in better RF line of sight to the device, but it's not always the best bet.
How the airtime will be increased if number of ssid increased ?
Will it be same if one or two
Each SSID on an Access Point is sending beacons. Eash SSID sends a beacon about every 100 ms. If you have 1 SSID on 1 AP, you are sending 10 beacon a second. If there are 2, you are sending 20 beacons. And so on. Each SSID has to send out unique beacons with its own information. More SSIDs = More Beacons being sent = More airtime being used.
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