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Measuring cellular signal strength  Received Signal Strength Indicator (RSSI) is a measurement of the Radio Frequency (RF) power present in a received radio signal at the mobile device. It is generally expressed in dBm and the best throughput comes from placing the device in an area with the highest RSSI. The Cellular page on the Status: Statistics screen shows the current state of the cellular modem including the RRSI. This screen will display automatically on an ACM5000-G or IM4200-X-G or if an externally attached USB cellular modem is detected. -100 dbm or less = Unacceptable coverage -99 dbm to –90 dbm = Weak Coverage -89 dbm to – 70 dbm = Medium to High Coverage -69 dbm or greater = Strong Coverage 
With the ACM5004-G cellular router the RSSI can also be seen from the cellular status LEDs. The WWAN LED on top of unit is OFF when in reset mode or not powered. When powered it will go ON and while searching for service it will flash off briefly every 5sec. However once a cellular connection has been established, the WWAN LED will blink at a rate proportional to traffic signal strength detected i.e. OFF =Low, (lower than -100 dBm) Blinking Slow = Low to Medium (-99 to -90 dBm) Blinking Fast = Medium to High (-89 to -70 dBm) ON= High (-69 dBm or higher) Maximizing cellular signal strength
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