Lte Signal Status; Signal Bars Explained - Digi 6350-SR User Manual

Initial setup

LTE signal status

Once powered on with its plug-in modem connected (including the activated SIM card), the Digi 6350-
SR/6355-SR will boot up and attempt to join its cellular network. Initialization may take 30-60
seconds.
LEDs on the Signal Strength Indicator show the quality of cellular reception.
The Network Status LED displays the cellular network connection status (that is, whether it is on a 3G
or 4G connection or unable to connect to either).
Refer to the following tables for more information:
These measurements are negative numbers, meaning the smaller negative values denote a larger
number. So, for example, a -85 is a better signal than -90.
Note For more information regarding how signal strength is calculated and subsequently displayed via
the LED indicators, see

Signal bars explained

The LTE signal status bars are calculated using various algorithms based on the network type it is
connected to. For 4G LTE, the RSRP, SNR, and RSSI values are all factored in to determine the
reported signal strength bars. For 3G networks (including HSPA+) and 2G networks, the signal
strength bars are determined by the RSSI value.
4G LTE algorithm
Determine RSRP, SNR, and RSSI values separately, using the following
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, then use RSSI as the value and run it through the same algorithm described above.
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
Digi 6350-SR/6355-SR LTE Router User Guide
Signal bars explained.

LTE signal status

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