The measure of a connection depends on both the Signal Strength and Signal Quality. RSSI is a measure of Signal Strength, while CINR, SINR, and Ec/Io are measures of Signal Quality for various technologies. The values we report are specific to different technologies (e.g. LTE) and carriers (e.g. Verizon).
NOTE: The following values are approximations; they are solely CradlePoint’s interpretations. Each of these values will vary for different technologies and carriers: contact your carrier for more authoritative information. CradlePoint does not guarantee adequate performance, regardless of the Signal Strength and Signal Quality. An adequate connection depends on many different factors, including:
- Proximity to the cellular tower
- Tower load
- Physical barriers (mountains, buildings, trains, etc.)
- Competing signals
- Signal going through a cellular repeater
Signal Strength and Signal Quality numbers do not incorporate all of the relevant factors. In particular, measurements of Signal Strength and Signal Quality for a specific moment do not reflect on the STABILITY of a connection, as these values will vary as conditions change.
|Excellent||above −65 (closer to 0 is better)|
|Good||−65 to −75|
|Fair||−75 to −85|
|Excellent||above −2 (closer to 0 is better)|
|Good||−2 to −5|
|Fair||−5 to −10|
SINR = Signal to Interference plus Noise Ratio (LTE only; measured in dB)
|Good||10 to 12.5|
|Fair||7 to 10|
CINR = Carrier to Interference plus Noise Ratio (WiMAX only; measured in dB)
|Good||16 to 22|
|Fair||9 to 16|
There is no black and white answer to what constitutes a successful connection. It is possible to disconnect with green values – or connect with red values – for several reasons, including:
1) Modems may vary.
2) You must factor in BOTH Signal Strength and Signal Quality.
3) Signal Strength and Signal Quality values do not hold constant.
4) Other factors: tower load, signal going through a repeater/booster, etc.