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signal quality indicators
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August 15, 2013
11:47 am
Henk Helmantel
Forum Posts: 520
Member Since:
May 28, 2013
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Hello Matt,

The GSM Modem Gateway checks the Received signal strength indication (RSSI) value of the GSM modem every 10 minutes and uses the following table for the network signal strength:

RSSI 0-11: Low
RSSI 12-19: Average
RSSI 20-98: High
RSSI 99: No signal

It then increases the SignalQuality.... value with one, depending on the signal strength. Using your numbers, SignalQualityHigh 6924 means that the GSM Modem Gateway had 6924 RSSI values between 20 and 98, 62% of all measurements. In 38% of the measurements the RSSI value was 12-19 or Average network signal strength.

The percentages give you an indication of the signal quality of the GSM modem during the whole time the statistics are kept (you can reset the statistics from the menu). If you want to know the most resent signal quality you can check the NetworkSignalStrength value or the RSSI value in the statistics of the Web Connector.

The RSSI value is not always a good indication of the reliability of the modem, some modems work very well with a low signal strength indication and some modems need an average signal strength to be reliable or for better SMS send and receive speed. In most situations, only the No Signal indication (RSSI 99) is an indication that the modem is faulty or that the modem is located in a room without sufficient network signal strength.

Regards, Henk

August 15, 2013
4:45 am

we are using Diafaan with a SAP back-end with great success in Singapore with auxiliary gateways installed in Hong Kong and Malaysia. I have a question related to the gateways as shown in the gateway status page in the Diafaan web connector. It seems the web connector shows a bit more information than the windows application 😉

In the web connector gateways status page we see for example:
SignalQualityNoSignal: 0
SignalQualityLow: 0
SignalQualityAverage: 4240
SignalQualityHigh: 6924

How can we interpret these numbers?
How often are these figures refreshed?
How is the average calculated?

Background: On most modems we got 100% reception from the start, but in one modem we see that the signal quality does not go above 63% in the Diafaan windows application. In fact it does not change at all, even if we switch antennas, relocate them etc...Do you have any hints testing out / optimizing signal quality?


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