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Valid Cellular Data Connections are dependent on a cellular modem's, Signal Strength, and Signal Quality.
- Influences connection to the cellular tower.
- Represented by RSSI, measured in dBm.
- RSSI is a negative dBm value. Values closer to 0 are stronger signals.
The ‘lower number’ represents better signal strength.
- NOTE: Signal Strength must be reviewed by the numeric values, ie. -dBm. The number of signal bars displayed by devices may give inaccurate perception of actual signal strength.
- Influences data throughput speeds on mobile broadband networks.
- Represented by signal noise ratios, measured in dBm.
Noise ratio representation varies by mobile broadband technology:
- SINR is a positive dBm value.
- Higher SINR numbers = better quality connection.
- CINR is a positive dBm value.
- Higher CINR numbers = better quality connection.
CDMA EVDO: EC/IO
- EC/IO is a negative dBm value. Values closer to 0 are stronger signals.
- Lower EC/IO ‘numbers’ = better quality connection.
- Both Signal Strength and Signal Quality must be considered for successful cellular data connection.
- Measured or reported values vary by modem, carrier, and network environment.
- There is no black/white answer to what constitutes a successful connection.
- Although signal strength may appear to be adequate, throughput speeds may vary due to dependencies on cellular tower loads.
Published Date: 9/8/2015
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