Tim, I have had 100% success by using a good quality shielded cable and following a strict bonding regiment. Bonding the antenna, radio, mast and cable to the tower at the top is imperative, as is the same process at the bottom. It's also important that the tower be bonded and that the bond is common with that in the equipment room. Make sure the inside end of the cable is bonded as well. In other words, there should be no difference in potential between the ground in the equipment room, the tower or your equipment on the tower. You must carry that bonding through to the rack and equipment you place in the room as well. Also, be sure to use grounded cable on jumpers. And the real trick is putting ferrite beads on both ends of the POE cable.
I had a site exhibiting between 50 and 70 percent packet loss between the topside radio and the router in the room when initially installed. The installer never noticed there were two FM stations on the tower ( 55Kw and 30Kw ). We even swapped radio equipment twice because he insisted there were no transmitters in close proximity. Once we "discovered" the FM stations he did as I described above and we went immediately to 0% packet loss from the router. Joe -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Tim Warnock Sent: Tuesday, February 28, 2012 9:15 PM To: 'WISPA General List' Subject: [WISPA] ethernet and towers with FM transmitters Hi All, I have a question as to how other operators are handling POE radio links and high power FM transmitters. We often see things like a radio will run errors or drop to 10mbps instead of 100mbps until we find a good position on the tower that its happy with. Once its happy we never have an issue again. We've tried earthing, not earthing, STP, UTP. Nothing seems to definitively solve the issue. Does anyone have any advice they'd like to share? It would be muchly appreciated. Thanks Tim _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless
