I am a proud subscriber of a state-owned and world’s 7th largest telecom company. I enjoyed great broadband service from the company contrary to the public opinion. But the pleasure ended at the beginning of this monsoon when my wireless router repeatedly dropped the connection; The link goes down for a minute before it comes up again. If you are facing the similar problem, you should read this post on why it happens so.
Repeated connection drop is not a planned attack on you by the ISP nor it is a curse of nature. Generally it is not a problem with your modem/router too. Connection drop in this case is more like a short-lived contract ended by failure of terms. Your router and some equipment in the telephone exchange engage in the process of establishing a service contract, this process is called handshake.
While handshake, router and exchange-equipment considers many parameters one important one is SNR (signal-to-noise ratio). SNR compares the level of a desired signal to the level of background noise. The higher the SNR value the better the communication. Router and exchange-equipment agrees on certain speed of data transfer according to the measured SNR at handshake. SNR ratio that is measured at handshake is not fixed, it varies during the course of communication.
SNR margin is the SNR above the minimum SNR needed to sustain the agreed speed. If it takes 20dB to connect at a given speed, and the actual SNR is 26dB, you will have an SNR margin of 6dB. If the SNR crosses this margin the connection is terminated and router keeps trying for reconnection.
Frequent connection drops occur when the SNR value is very low as margin is narrow and minor drops in SNR value may go below the margin. The causes of low SNR are interference, poor cable shielding among other factors.
How you know current SNR value:
Connect to your router by typing 192.168.1.1 in browser.
Find out “Status” tab somewhere in the interface.
From Status tab you can find either SNR or SNR Margin or both depending on yourrouter’s model.
What you can do to achieve a higher SNR:
Check the wiring in your home, wires should not be bent below 4 inches diameter.
Check the connections, they should be tight.
Check your splitter, use a good quality splitter (filter).
Call ISP guy.