Log into your MR40 portal. (The IP address is found on the bottom, but is usually 192.168.1.1)
Once logged in on the left side of the screen, you will see a dropdown menu. Select Modem.
Next, select Network Status.
This will pull up Signal/Cell Information.
If you scroll down to the 3rd row, you will see RSRP and RSRQ.
Signal Strength (RSRP) is best at -70 to -90. Mid-range from -90 to -110. Poor quality -111 to -120. Anything lower is unusable.
Signal Quality (RSRQ) is best at 0 to -8, mid-range from -8 to -11, poor quality if -12 or above.