Why does Shaw allow only one modem per account? Why wouldn't they want their customers to be able to have access to a strong signal in more than one area of their home?
The strong signal you are referring to is WiFi within the home and not necessarily a function of multiple modems, but the router half of the Shaw units and how they are set up within the home.
More often than not, a correctly set up and placed modem will cover an entire home. A few guidelines in ensuring the WiFi is correctly setup, and that there are no major obstructions blocking the WiFi can go a long way to a great performing WiFi network.
There are challenges with multiple points within homes. There can become channel congestion issues, and issues where your device will not release from the weaker WiFi as you walk from one zone in your home to the next zone with stronger WiFi signal.
If you are having issues with your WiFi there are good articles here: Wireless Internet Overview
I hope this helps.
It is more usually a billing thing I believe, but they can create multiple accounts for your home, and put a modem on each.
Because each modem has it's own speeds, Shaw can/will set you up with two modems, but you have to pay for internet on both.
Long term though, you should look at improving your home's network on your own,
Access Points where you can run a wire (or PowerLine networking), and/or wireless repeaters where you can't, setting the repeaters near the 'dead' zones, where the signal is still moderate.
First though, try getting your own router, bridge your current modem, and see how much of a difference that makes
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