A:AnswerHi! The TL-SG108E is not a PoE switch model. If you are interested in an 8-Port, Gigabit PoE switch, we suggest considering our TL-SG108PE model, instead.
A:AnswerYes, you may add another one. You can use any ports. I think you should power up the earliest devices in the chain first. Modem first, then the router, then the first smart switch, then the next switch in the chain. Most switches have interchangeable ports. (Not true for POE or power over ethernet switches).
A:AnswerI don't think so. I have added an extra switch between my router and one of my computers and not noticed any change. The switches should support 1000Mbps which is faster than most of the internet service available.