Are you going to sell these? I have been looking for something like this to do repeater sites with.
Scottie ---------- Original Message ---------------------------------- From: Cameron Crum <cc...@dot11net.com> Reply-To: WISPA General List <wireless@wispa.org> Date: Thu, 11 Mar 2010 15:53:17 -0600 >That is the answer I was looking for. We have these multi-poe boards we >designed and had a bunch manufactured ... just passive devices that take >an input voltage and spread it across 9 ethernet ports with two of the >ports switchable between the input voltage and 12V. The signal side of >the ethernet ports go to mirrored ports on the other side of the board >to plug into a switch/router. I was thinking that if there was an easy >way to sense the connection, I could throw in an XOR chip and a few >small relays to make a cheap remote power cycle per port by simply >disabling the port on the switch or router on the signal side of the >board. Since the switch chip is involved, it becomes a much more complex >and expensive part. > >Cameron > > >On 3/11/2010 2:38 PM, Lawrence E. Bakst wrote: >> The link LED and all other LEDs for Ethernet Jacks/Connections are driven by >> the Ethernet PHY chip or the Ethernet chip itself the PHY is integrated. >> >> Link is turned on by the PHY sensing the LIT (link integrity test) in >> 10BaseT which I believe has become part of the auto-negotiation protocol in >> later standards. This is part of the Layer-1 (Physical Later) protocol in >> the spec. >> http://en.wikipedia.org/wiki/Autonegotiation >> >> So to be clear it's not just a LED hooked up to one of the wire via a >> resister or some analog hack like that. The PHY knows that their is another >> PHY on the other side of the cable and if the PHY sees the other PHY it >> turns on the LINK light. PHYs often provide other lines to show collision, >> speed, and duplex and these can be tied into other individual LEDS or >> bi-color LEDs. >> >> If the link lights are on at both ends the connection is good. It still >> might be the case that a duplex mismatch or bad auto-speed negotiation could >> cause problems. Both of these problems show up from time to time, especially >> on older gear. For both cases the cure is often to fix the speed or duplex >> on one side and that prevents the auto-negotiation from failing. >> >> One cause of not getting a link light is that a MDI/MDI-X mismatch. Most >> newer chips have auto MDI/MDI-X which prevents the problem in most cases. >> >> leb >> >> At 12:52 PM -0500 3/11/10, Robert West wrote: >> >>> Yeah, but which circuit? The transmit, receive or maybe the unused pairs? >>> >>> That got me wondering also. >>> >>> Anyone know what pair triggers the light??? >>> >>> Bob- >>> >>> >>> -----Original Message----- >>> From: wireless-boun...@wispa.org [mailto:wireless-boun...@wispa.org] On >>> Behalf Of Justin Wilson >>> Sent: Thursday, March 11, 2010 12:15 PM >>> To: WISPA General List >>> Subject: Re: [WISPA] Ethernet LEDs >>> >>> Simple terms it's the completion of a circuit. >>> >>> --- >>> Justin Wilson<j...@mtin.net> >>> >>> On Mar 11, 2010, at 11:29 AM, Cameron Crum<cc...@dot11net.com> wrote: >>> >>> >>>> This may be a little out there, but does anyone know what causes the >>>> "link" light to show on an ethernet jack when the cable is plugged in? >>>> Is it as simple as just attaching an led to one of the signal wires, >>>> or >>>> is there some logic in there. 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