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</o:shapelayout></xml><![endif]--></head><body lang=CS link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Osobne bych se velmi primlouval za pasivni PoE, i za cenu samotneho konektoru a trafa.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>U mensich zarizeni je to velice fajn.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>J.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> hw-list-bounces@list.hw.cz [mailto:hw-list-bounces@list.hw.cz] <b>On Behalf Of </b>hutta.j@seznam.cz<br><b>Sent:</b> Monday, February 25, 2013 12:33 PM<br><b>To:</b> hw-list@list.hw.cz<br><b>Subject:</b> Modul Eth PHY pro obecne pouziti <o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>Sla zde rec o PHY a zminka o Etht rozhrani se objevila i ve vlaknu Akoze curve tracer.<br>Trochu jsem se nad tim pres vikend zamyslel a zkusil nakreslit modul s nejakou pridanou hodnotu<br>Pridana hodnota by mela byt v pouziti LAN8740, ktery by se mel zacit dodavat v prubehu dubna a splnuje Energy Efficient Ethernet (IEEE 802.3az) coz znatelne snizuje spotrebu<br>Nevim zda se ma cenu takovym modulem zabyvat, v cine koupite hotovy PHY 10/100 za 200Kc a cena PCB+soucastek vychazi kolem, 150Kc.<br><br>Presto predkladam k diskuzi <br><br>Na schematku zatim neni dokreslen RESET a moznost pouzit jineho napajeni IO nez je 3.3V.<br><br>- Uvazoval jsem o implementaci PoE, spise Pasivní PoE nez PoE podle IEEE 802.3af. Nepodarilo se mi najit levny RJ-45 s integrovanym trafem, ktery by to umoznoval<br>- Uvazoval jsem o pridani dalsi ochrany proti bleskum, LAN87x0 maji sami o sobe ESD Performance +-8kV, ale mam overeno, uder blesku do zeme 50-100 od baraku nepreziji<br> bezne dostupne ESD diody <a href="http://cz.farnell.com/stmicroelectronics/usblc6-2sc6/esd-protection-3-5pf-17v-sot23/dp/1269406RL">http://cz.farnell.com/stmicroelectronics/usblc6-2sc6/esd-protection-3-5pf-17v-sot23/dp/1269406RL</a> pri dvou kusech stoji stejne jako samotny PHY obvod a udavana odolnost je stejna.<br><br>- nejsem si jist zda ma cenu umoznit pomoci odpru nastavovat adresu PHY a mod do ktereho se eth zapne po resetu?<br>- v ramci miniaturizace jsem uvazoval zda misto krystalu v 49US nepouzit SMD 6x3, je to vice sexy, ale hure dostupne a drazsi.<br>- PCB rad bych se vesel do 50mmx50mm prizeru, ktery cinane umi vyrobit v 10ks za 9.9$ snad se to vejde, PHY by kvuli ruseni nemelo byt k trafu v RJ-45 blize nez 25mm, provedeni podobne<br><a href="http://www.ebay.com/itm/DP83848-Ethernet-Physical-Transceiver-RJ45-connector-control-interface-Board-Kit-/260868624339?pt=LH_DefaultDomain_0&hash=item3cbcfb4fd3">http://www.ebay.com/itm/DP83848-Ethernet-Physical-Transceiver-RJ45-connector-control-interface-Board-Kit-/260868624339?pt=LH_DefaultDomain_0&hash=item3cbcfb4fd3</a><br><br>Uvitam pripadne pripominky a postrehy<br><a href="http://www.upnito.sk/0/8a4ypzfnyesbmwn8at33hdcktftmxpyv.png">http://www.upnito.sk/0/8a4ypzfnyesbmwn8at33hdcktftmxpyv.png</a><br><a href="http://www.smsc.com/Products/Ethernet_and_Embedded_Networking/Ethernet_Transceivers/LAN874x">http://www.smsc.com/Products/Ethernet_and_Embedded_Networking/Ethernet_Transceivers/LAN874x</a><br><br>Hutta<br><br><o:p></o:p></p><p class=MsoNormal>=<o:p></o:p></p></div></body></html>