ALDEN I-NET 151 Guide D'installation page 171

STATUS MENU
3G (WCDMA, TDSCDMA, CDMA, EVDO, CDMA-EVDO)
For 3G service mode, there are three relevant measurements:
• RSSI - Received Signal Strength Indicator. RSSI is a negative value, the closer to 0 the value, the stronger the
signal
• EC/IO - indicates the downlink carrier to interference ratio (signal quality). EC/IO is a negative dBm value. The
closer the values are to 0, the stronger the signs.
• RSCP - indicates the code strength of the received signal
The RSSI standard values for 3G are basically the same as 2G
RSSI
>= -70 dBm
-70 dBm to -85 dBm
-86 dBm to -100 dBm
< -100 dBm
-110 dBm
EC/IO
0 to -6
-7 to -10
-11 to -20
4G (LTE)
For 4G service mode, there are four relevant measurements:
• RSSI - Received Signal Strength Indicator. RSSI is a negative value, and the closer to 0, the stronger the signal
• SINR - Signal to Interference plus Noise Ratio (A minimum of -20 dB SINR is needed to detect RSRP/RSRQ).
Indicates the throughput capacity of the channel. As the name implies, SINR is the strength of the signal divided
by the strength of any interference
SINR
>= 20 dB
13 dB to 20 dB
0 dB to 13 dB
<= 0 dB
RSSI for LTE is a calculated from several other signal related measurements: RSSI = wideband power = noise +
serving cell power + interference power. For example, a 4G LTE modem might report an RSSI of -68 dBm, but:
RSRP = -102 dBm, RSRQ = -16 dB, SINR = -1.8 dB
In this case, the signal quality is actually very poor. This could be due to the device being some distance away from
the LTE transmitter. It's also possible that something is interfering with the signal, such as a building or other
obstructions between the device and the tower.
SSI
> -65 dBm
-65 dBm to -75 dBm
-75 dBm to -85 dBm
-85 dBm to -95 dBm
<= -95 dBm
ALD-16690
Signal strength Description
Excellent Strong signal with maximum data speeds
Good Strong signal with good data speeds
Fair Fair but useful, fast and reliable data speeds may be
attained, but marginal data with drop-outs is possible
Poor Performance will drop drastically
No signal Disconnection
Signal quality Description
Excellent Strong signal with maximum data speeds
Good Strong signal with good data speeds
Fair to poor Reliable data speeds may be attained, but marginal data
with drop-outs is possible. When this value gets close to
-20, performance will drop drastically
Signal strength Description
Excellent Strong signal with maximum data speeds
Good Strong signal with good data speeds
Fair to poor Reliable data speeds may be attained, but marginal data
with drop-outs is possible. When this value gets close to 0,
performance will drop drastically
No signal Disconnection
Signal strength Description
Excellent Strong signal with maximum data speeds
Good Strong signal with good data speeds
Fair Fair but useful, fast and reliable data speeds may be
attained, but marginal data with drop-outs is possible
Poor Performance will drop drastically
No signal Disconnection
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