Signal Quality Bars Explained - Digi IX20W-PR User Manual

Digi IX20 hardware reference
n Off: No Ethernet link detected.
n Solid green: 10/100 Mbps link detected.

Signal quality bars explained

The signal status bars for the Digi IX20 measure more than simply signal strength. The value reported
by the signal bars is calculated using an algorithm that takes into consideration the Reference Signals
Received Power (RSRP), the Signal-to-noise ratio (SNR), and the Received Signal Strength Indication
(RSSI) to provide an accurate indicator of the quality of the signal that the device is receiving.
For 3Gnetworks (including HSPA+) and 2Gnetworks, the signal strength bars are determined by the
RSSI value.
4G LTE algorithms
For 4GLTE, the IX20 device determines the RSRP, SNR, and RSSI values separately and uses the
following algorithms to display the signal quality:
RSRP > -85, rsrp_bars=5
-95 < RSRP <= -85, rsrp_bars=4
-105 < RSRP <= -95, rsrp_bars=3
-115 < RSRP <= -105, rsrp_bars=2
-199 < RSRP <= -115, if we're connected to the cellular network, rsrp_bars=1,
if not rsrp_bars=0
If RSRP <= -199, the device uses the RSSI as the value with the same algorithm:
SNR >= 13, snr_bars=5
4.5 <= SNR < 13, snr_bars=4
1 <= SNR < 4, snr_bars=3
-3 < SNR < 1, snr_bars=2
-99 < SNR <= -3, if we're connected to the cellular network, snr_bars=1, if not
snr_bars=0
Once the snr_bars and rsrp_bars values are determined, the device uses the lesser of the two as the
reported signal a bars.
3G algorithm
For 3G, the IX20 determines RSSI signal strength:
RSSI > -80, bars=5
-90 < RSSI <= -80, bars=4
-100 < RSSI <= -90, bars=3
-106 < RSSI <= -100, bars=2
RSSI <= -106, if we're connected to the cellular network, bars=1, if not bars=0
bars is then reported as the signal strength bars.
2G algorithm
For 2G, the IX20 determines RSSI signal strength:
RSSI > -80, bars=5
-89 < RSSI <= -80, bars=4
-98 < RSSI <= -89, bars=3
-104 < RSSI <= -98, bars=2
RSSI <= -104, if we're connected to the cellular network, bars=1, if not bars=0
IX20 User Guide
IX20 LEDs
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