Unreliable WiFi Communication
Power Quality (see tech bulletin #XXX)
Low Signal Strength
Enclosure cause signal degradation
Provide quality power
Connect to Access Point (AP) with adequate signal strength
Relocate the antennas to a more suitable location or use a plastic (polycarbonate) enclosure
We have seen issues where sites have unreliable WiFi communication due to low signal strength. The signal strength reading next to the SSID on the FW controller is an RSSI (received signal strength indicator). This reading is based on a 0%-100% signal being received at the controller from the access point. We suggest no less than 65% for reliable communication.
You should always perform a site survey using some sort of WiFi analysis application (mobile device) or program (PC based). Depending on the application / program you use, you might see a reading using -dBm. This reading is based on signal loss. For WiFi, 1mV is used to transmit power. The farther the receiving device is away from the transmitter (AP), the more signal loss you will have and the weaker the signal strength will be.
RSSI – 80 = Good
RSSI – 65 = Good
RSSI – 50 = Bad
RSSI – 45 = Bad
-dBm – 40 = Good
-dBm – 65 = Good
-dBm – 70 = Bad
-dBm – 80 = Bad
WiFi is a radio frequency, so any metal enclosures, structural steel, thick concrete structures will disrupt the signal. Depending on the application, remote mount antenna kits may need to be used to get an adequate signal outside of the enclosure.