Every Wi-Fi network transmits and receives data on a certain frequency, or channel. As Wi-Fi data is digital, many different devices can communicate successfully on the same channel. By default the channels used are typically either channel 6 or channel 11.
As shown in the simplified diagram below, three routers are all using channel 6. The data isn't interfering.
To help to improve this situation, it would seem logical to move one of the routers to another channel. At first glance channel 7 seems like a good option; there's nothing else using it, so why not?
What's actually happening is this:
So what about other channels? Keeping in mind that we need two spare channels either side, channel 11 seems like the next best channel to go for. Using it looks like this:
Each signal is now being transmitted correctly, and the congestion on channel 6 is a little better. Channel 11 is completely free, so the data is communicated efficiently. Channel 1 would also be a good channel to try and would behave in the same way as channel 11.
Finding the best WiFi channel to use
How do we do this on the TPG Supplied Modems?
Huawei HG 659:
Change Channels as per below screen shot