Installing APs on a FM tower. Fiber from base of tower > fib/copper switch at AP location. STP encased in flexible metal liquid tight from fib/copper switch NEMA enclosure to APs. APs are getting eth port errors when in 100FDX, locking in 10FDX solves the issue.
24VDC is injected in to each AP in the NEMA enclosure - I have ferrite beads on both ends of the STP (near switch and base of AP) but problem remains. Additional ferrite beads on the DC power line, still have issues. I believe the majority of EMI is entering through the power cable. I did not run a shielded power cable or power through coax or anything intelligent like that - just a standard 2-16ga outdoor cable. So I'm looking for something to just drain off any conducted FM EMI off that 24VDC power line before it gets injected directly on the CAT5 that feeds those APs. Thanks for reading! `S -----Original Message----- From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On Behalf Of Patrick Shoemaker Sent: Thursday, April 15, 2010 12:21 PM To: WISPA General List Subject: Re: [WISPA] EMI Filtering Off the ethernet line or power? The EMI filter you posted should do the trick for DC power. For ethernet, the "WISP approved" method seems to be adding ferrite beads to the cat-5 cable at the end. I've never done this myself. Tell us a little more about the problem you're trying to solve... Patrick Shoemaker Vector Data Systems LLC shoemak...@vectordatasystems.com office: (301) 358-1690 x36 http://www.vectordatasystems.com Scott Vander Dussen wrote: > Any suggestions for filtering off FM noise? > > -----Original Message----- > From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On > Behalf Of Patrick Shoemaker > Sent: Thursday, April 15, 2010 12:03 PM > To: WISPA General List > Subject: Re: [WISPA] EMI Filtering > > This is for Canopy radios: > > http://www.wbmfg.com/products/accessories/surge-suppressor > > Test port, voltage/current indicator LEDs, lightning protection. > Weatherproof enclosure. > > > Patrick Shoemaker > Vector Data Systems LLC > shoemak...@vectordatasystems.com > office: (301) 358-1690 x36 > http://www.vectordatasystems.com > > > RickG wrote: >> Lightning season is when I miss my home state of California the most. >> You really dont know what your missing! I feel like the British must >> have felt in WWII during the German bombing runs. Every year, boom, >> boom, boom. (sorry for the dramatics). >> Neither did I include an LP/EMI device in my business model but I also >> didnt count on so many truck rolls. It just becomes a matter of which >> is more cost effective and beneficial to customer satisfaction. I too >> prefer that the customer be there but obviously this is only a side >> benefit along with ease of access. >> At any rate, you're "maintenance adapter" is right on target but I'm >> not big into home made stuff. So, I'm hoping someone knows of a device >> out there that incorporates these features and is factory made. >> -RickG >> >> On Thu, Apr 15, 2010 at 12:33 PM, Scott Vander Dussen >> <sc...@velociter.net> wrote: >>> Rick- >>> Obviously this application is for a tower (hence APs..). Our pricing model >>> doesn't permit us the extra $20-30 per customer plus installation time etc. >>> to install a LA/EMI Filter for every customer. Lighting isn't really a >>> problem where we are (California) - Since we started in 2002 never had a >>> single tower, customer, anything negatively affected by lighting. >>> >>> That being said - we don't like to do a maintenance call when the customer >>> isn't home b/c then you can't get to their equipment (which may be the >>> problem) or their power supply for the radio etc. When we need to, and the >>> customer isn't home - we have simple "maintenance adapter" that we made - >>> it has two RJ45 jacks and a short CAT5 cable coming out. The adapter is >>> placed in-line between the radio and PoE CAT5 (to customer's power supply >>> in home) - the short CAT5 goes plugs into the radio and the remaining RJ45 >>> port has access to the network only (PoE pins removed) for use in your >>> laptop. >>> >>> Down side is it requires rebooting CPE to install (unplugging cable) and >>> also you need to get access to CPE which can be difficult sometimes. >>> >>> `S >>> >>> >>> -----Original Message----- >>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >>> Behalf Of RickG >>> Sent: Thursday, April 15, 2010 9:23 AM >>> To: WISPA General List >>> Subject: Re: [WISPA] EMI Filtering >>> >>> This is inline with my previous question about a lightning protector. >>> Would it be a good idea to incorporate a unit that does filtering/LP >>> in a small enclosure on the outside of the home/business with an >>> ethernet port for easy access to the network rather than having to >>> depend on the customer to be there? >>> >>> On Thu, Apr 15, 2010 at 11:43 AM, Scott Vander Dussen >>> <sc...@velociter.net> wrote: >>>> Looking to filter conducted FM EMI off a 24VDC power line that supplies >>>> Canopy APs with power. Would something like this be appropriate, or even >>>> on the right track? >>>> <http://bit.ly/a3WKJ9>http://bit.ly/a3WKJ9 >>>> >>>> Thanks, >>>> `S >>>> >>>> >>>> -------------------------------------------------------------------------------- >>>> WISPA Wants You! Join today! >>>> http://signup.wispa.org/ >>>> -------------------------------------------------------------------------------- >>>> >>>> WISPA Wireless List: wireless@wispa.org >>>> >>>> Subscribe/Unsubscribe: >>>> http://lists.wispa.org/mailman/listinfo/wireless >>>> >>>> Archives: http://lists.wispa.org/pipermail/wireless/ >>>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! Join today! >>> http://signup.wispa.org/ >>> -------------------------------------------------------------------------------- >>> >>> WISPA Wireless List: wireless@wispa.org >>> >>> Subscribe/Unsubscribe: >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> Archives: http://lists.wispa.org/pipermail/wireless/ >>> >>> >>> >>> >>> -------------------------------------------------------------------------------- >>> WISPA Wants You! Join today! >>> http://signup.wispa.org/ >>> -------------------------------------------------------------------------------- >>> >>> WISPA Wireless List: wireless@wispa.org >>> >>> Subscribe/Unsubscribe: >>> http://lists.wispa.org/mailman/listinfo/wireless >>> >>> Archives: http://lists.wispa.org/pipermail/wireless/ >>> >> >> -------------------------------------------------------------------------------- >> WISPA Wants You! Join today! >> http://signup.wispa.org/ >> -------------------------------------------------------------------------------- >> >> WISPA Wireless List: wireless@wispa.org >> >> Subscribe/Unsubscribe: >> http://lists.wispa.org/mailman/listinfo/wireless >> >> Archives: http://lists.wispa.org/pipermail/wireless/ > > > -------------------------------------------------------------------------------- > WISPA Wants You! Join today! > http://signup.wispa.org/ > -------------------------------------------------------------------------------- > > WISPA Wireless List: wireless@wispa.org > > Subscribe/Unsubscribe: > http://lists.wispa.org/mailman/listinfo/wireless > > Archives: http://lists.wispa.org/pipermail/wireless/ > > > > > -------------------------------------------------------------------------------- > WISPA Wants You! 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