Many terminators are faced with the loss of GSM gateway channels. This is especially true of inexpensive Chinese equipment. For a while, all the channels are functioning properly, and then some of them start "falling off" with an arbitrary frequency, that is, they lose registration in GSM networks.
A similar situation occurs when you use SIM-cards of one and different operators. And, as a rule, in the same place where the gateway is, you can make calls from a mobile phone absolutely with no problems with the network.
What is the cause of this problem? There are two options - either the signal is too weak or too strong. In the latter case, there may be not only a loss of GSM-channels but also "rejection" of calls even if you are a registered user. It can be concluded that the terminator should ensure optimum signal strength to have the equipment working like clockwork.
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RSSI (received signal strength indicator) can be determined by indicators on the gateways. They change color as you change the indicator. If the value of RSSI is up to 10, LEDs become red (very weak signal), from 10 to 15 - orange hue (the average signal level). If a signal is good (RSSI is more than 15), there are blue lights on the gateway.
Terminators using the gsm voip goip equipment often wonder why channels malfunction when the signal is good. As stated above, the too strong signal may be the reason. In order to gain optimum values of RSSI, the combiner can be used - a device that converts the digital signal into multiple signals that are equivalent to their sum. With its help, you can align the signals by channels. Adder significantly improves the quality of communication.
If the RSSI value is too low (2 to 8), you should use special amplifiers. You can also install additional antennas on the gsm goip gateway. Furthermore, it is important to place the equipment in front of the operator’ base station closer to the window. Upon reaching the optimal level, the problem with the loss of signal channels is eliminated.
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