No, you don't need another"transmitter" at the router, giving you 2 senders, they should be plug and play as long as you never added security in the first place, try the one thats not working upstairs, downstairs and make sure it works there, as you could have different fuse boards or circuits upstairs
Ive just spoke to LINKSYS support, they said only one needs to come out of the router, the one upstairs seems to be on a differnet circuit breaker so it wont work, another question, are extension no good>? I've just tried an extension from downstairs to upstairs and it still did not work.
He never paired them and was not asking that he was asking if each set needed a source at the router, to which the answer is no, it looks like he's on a different fuse/circuit board so they wont work,
What extension you mean? Electrical, they are not recommended, wireless might be an option although not recommended
Good, you were able to demystify the mystery!Well, they only worked in pairs