Can i use one pair of these to convert a single rg59 cable run to a multi-port poe switch? we currently have 3 analog cameras in a detached garage.

Dear Customer, Thank you for your questions. Yes, it should work but please be aware that the Max bandwidth is 100Mbps under 300m. if the bandwidth of your 3 analog cameras is less than 100Mbps. Thanks so much! eKL customer Support

Are two devices shipped, one transmitter and one a receiver? Are they marked differently or appear identical? Thanks

Dear Customer, Thank you for your questions. Yes, these are a pair of units. one is transmitter and the other is reciver, but they appear identical, it means that it'll work no matter you use either of them as transmitter or receiver. Any questions feel free to keep in touch with us anytime via Amazon's message service below: https://www.amazon.com/ss/help/contact/?_encoding=UTF8&marketplaceID=ATVPDKIKX0DER&ref_=v_sp_contact_seller&sellerID=A1SSFEG11DXZGC Have a good day! eKL Customer Support

Are there any known issues using these with RG 11 cable already buried between buildings?

Dear Customer, This set of device has great compatibility with coax cables we don't know what kind of project you want to use them for so we suggest you can contact us first by Amazon's direct messaging service: https://www.amazon.com/ss/help/contact/?_encoding=UTF8&marketplaceID=ATVPDKIKX0DER&ref_=v_sp_contact_seller&sellerID=A1SSFEG11DXZGC So that we could assist further. pls be assured that ekl provide 30 days money back guarantee for any reasons and 12 months warranty plus lifetime technical supports. Looking forward to hear from you soon. eKL Customer Support

Will this carry poe? power to the camera from a poe switch?

Dear Customer, Thank you for your questions. This set of units don't support PoE functionality, so please use this set of units matching a camera has a power supply. Any questions feel free to keep in touch with us anytime. Have a good day. eKL Customer Support