I purchased a new SB8200 (and TP-Link router) to replace a COX Panoramic combo modem/router that I was renting.
I have one problem: the SB8200 will not reconnect when power cycled. Specifically, unplugged, then plugged back in. The send and receive lights will go solid green, but the online light just blinks. Eventually (minutes), the modem appears to restart and the lights cycle through startup phases, resulting in the same status described above. It seems like the modem will do this forever (I give up after 30 minutes). Using the management webpage, it appears each reset cycle is using an different set of channels to attempt the connection.
I only way I’ve discovered to get the SB8200 to connect is to leave it unpowered for several minutes (like 10), then plug it in. Only then will it successfully establish a connection.
I’ve validated that all signals levels are good (per the SB8200: CABLE SIGNAL LEVELS FAQ). I’ve had COX at my house, and they’ve verified my cable service is within spec.
Do have a bad modem? Or is this standard behavior for this product?