Using An Old Bt Hh3 As A Range Booster

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Just managed to connect a second HH3 to my "primary" one to use as a wireless range booster. Works a treat. Both units are HomeHub 3's but one a model A the other a B. Basically both hubs are hardwired together. Gives me a wireless point and 4 ports the other side of the house. You can also do it with say an old HH2.