The modem bypass port is not amplified so an EMTA would still receive signal if power was interrupted. However if you had an access point on an active or unity gain leg, on an existing line going to a cablebox the emta would not see the access point. So the new models came out. The ones with the red box and wording on the front. Where that problem is solved. Sorry exact model numbers are too much for me now. The MoCA filter is still needed. The wording is misleading and recommnded to still use it on the rf input. Try to give so more info later. Quickly some of the amps are unity gain, just making up for internal splitter loss and some provide additional gain.