Editing Power over Ethernet (section)

===Cisco===<!-- section header used in redirects -->
Some Cisco WLAN access points and [[VoIP phone]]s supported a proprietary form of PoE<ref name="pinout">{{cite web |url=http://pinoutsguide.com/Net/poe_pinout.shtml |archive-url=https://web.archive.org/web/20150401193537/http://pinoutsguide.com/Net/poe_pinout.shtml |archive-date=2015-04-01 |title=Power over Ethernet (POE) pinout}}</ref> many years before there was an IEEE standard for delivering PoE. Cisco's original PoE implementation is not software upgradeable to the IEEE 802.3af standard. Cisco's original PoE equipment is capable of delivering up to {{nowrap|10 W}} per port.  The amount of power to be delivered is negotiated between the endpoint and the Cisco switch based on a power value that was added to the Cisco proprietary [[Cisco Discovery Protocol]] (CDP).  CDP is also responsible for dynamically communicating the Voice VLAN value from the Cisco switch to the Cisco VoIP Phone.

Under Cisco's pre-standard scheme, the PSE (switch) will send a [[fast link pulse]] (FLP) on the transmit pair. The PD (device) connects the transmit line to the receive line via a [[low-pass filter]]<!--some docs says relay instead, contradiction-->. The PSE gets the FLP in return. The PSE will provide a common mode current between pairs 1 and 2, resulting in {{nowrap|48 V DC}}<ref name="ciscopress_ciscophone">{{cite web|title=Planning for Cisco IP Telephony > Network Infrastructure Analysis|url=http://www.ciscopress.com/articles/article.asp?p=385336&seqNum=2&rll=1|access-date=2010-01-12|archive-date=2011-07-08|archive-url=https://web.archive.org/web/20110708155947/http://www.ciscopress.com/articles/article.asp?p=385336&seqNum=2&rll=1|url-status=live}} 2010-01-12 ciscopress.com</ref> and {{nowrap|6.3 W}}<ref name="conticomp_CAT6500POE_ds">{{cite web|title=Power over Ethernet on the Cisco Catalyst 6500 Series Switch|url=http://www.conticomp.com/PDF/CAT6500POE_ds.pdf|url-status=dead|archive-url=https://www.webcitation.org/5u2FxkQis?url=http://www.conticomp.com/PDF/CAT6500POE_ds.pdf|archive-date=2010-11-06}} 2010-01-12 conticomp.com</ref> default of allocated power. The PD must then provide Ethernet link within {{nowrap|5 seconds}} to the auto-negotiation mode switch port. A later CDP message with a TLV tells the PSE its final power requirement. A discontinuation of link pulses shuts down power.<ref name="cisco_technote00">{{cite web|title=Understanding the Cisco IP Phone 10/100 Ethernet In-Line Power Detection Algorithm – Cisco Systems|url=http://www.cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a00801189b5.shtml|access-date=2010-01-12|archive-date=2009-02-02|archive-url=https://web.archive.org/web/20090202164951/http://cisco.com/en/US/products/hw/phones/ps379/products_tech_note09186a00801189b5.shtml|url-status=live}} 2010-01-12 cisco.com</ref><!-- In-line Power Patch Panel (IPPP) send 347 kHz if return in 50 ms, 16 transitions 50/50 ms, then poll 50 ms every 600 ms device still present -->

{{anchor|UPOE}}In 2014, Cisco created another non-standard PoE implementation called '''{{vanchor|Universal Power over Ethernet}}''' ('''UPOE'''). UPOE can use all four pairs, after negotiation, to supply up to 60&nbsp;W.<ref>{{cite web |title=Cisco Universal Power Over Ethernet – Unleash the Power of your Network White Paper |url=http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-4500-series-switches/white_paper_c11-670993.html |archive-url=https://web.archive.org/web/20171128140727/http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-4500-series-switches/white_paper_c11-670993.html |archive-date=2017-11-28 |date=2014-07-11 |publisher=Cisco Systems}}</ref>