Hello @HAlqaramani, 1- Regarding the material of the fiber optic itself and the physical security level, it depends on the environment of the installation, If will be underground, so it should be written that it's supporting the underground resistance, if it will be in the air, it should be for example resistant to the weathering conditions, etc., everything will be written in the description of the product! you should read it carefully, and it should be guaranteed from the supplier! 2- Patch cords (between ODFs and SFPs) it's not a big deal what kind, the most important is to have the same specifications of the ODF connector, SFP and the fiber optic itself that between buildings! I mean that all should be for example SM, UPC and so on, as we mentioned before! while the physical specification which is the material itself, isn't important as it's used inside the cabinets which's a secure place! 3- Regarding the TX and RX, you will have in each side (I mean in the side of building 1 and the side of building 2 "I am considering that you are connecting both buildings together") 2 simplex cords coming from the ODF and going to the SFP, these 2 cords are representing 1 for TX and 1 for RX, so the TX of building 1 should be RX of building 2! The most important how to know which is TX and which is RX? the answer is simply " you don't need to know, because if you connect TX of building 1 to TX of building 2, the port of the switch will not be UP, so you will exchange it and it will come UP immediately! So, don't care to mark them during splicing (you need to mark the fiber between the buildings itself and even its cores) you just need to insert the right pair to the SFP and if it will not be UP, so exchange it in only 1 side, then it will work! Please don't hesitate to contact me if you have any inquiry! Please don't forget to RATE all helpful responses and to MARK a solution! Bst Rgds, Andrew Khalil
... View more
