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--- m0dul-ethernet [2012/06/03 10:35] – KSZ8851SNL equinox
+++ m0dul-ethernet [2012/06/09 21:32] (current) – equinox
@@ Line 39: / Line 39: @@
 -> So far it looks like the "smart" variant is the way to go.
-Please implement [[http://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol|LLDP]] and you will make the NOC happy :)
-(Might not be possible on the W5100, it's an ethernet protocol.)
 ===== Power =====
@@ Line 48: / Line 45: @@
 Again two options here:
-"simple" homegrown POE (just use the unused pairs to send Power)
+  * "simple" homegrown POE (just use the unused pairs to send Power)
-"normal" POE (802.3af or 802.3at) (.af sounds simple - provides for ~ 200mA @ 48V - enough for us)
+    * **homegrown/uncontrolled PoE will be instantly refused by the NOC.**  Frying an 20k€ Switch by misplugging a cable is not an acceptable risk.  This applies for all uses that touch the building infrastructure -- even if it's not supposed to be linked to a "big" switch you can always misplug something.
+  * "normal" POE (802.3af or 802.3at) (.af sounds simple - provides for ~ 200mA @ 48V - enough for us)
 according to Wikipedia, the injector decides wether to provide power via the "unused" or the "data" wires, which means more work for us...
@@ Line 66: / Line 64: @@
 -> Still unclear if there are no other options.
+Discrete Magnetics:
+  * [[http://www.epcos.com/inf/30/ds/lan_mod/B78476A8245A003.pdf|Epcos B78476A8245A3]] [[http://de.futureelectronics.com/de/technologies/passives/transformers/signal-magnetic-transformers/lan/Seiten/5173968-B78476A8245A3.aspx?IM=0|source: Future Electronics]] 100MBit PoE
+Recommended reading for magnetics selection: http://www.ceetus.com.cn/paper/VSC8201.pdf (Vitesse magnetics design note, cannot find original on Vitesse's website anymore)
 ===== Connection to r0ket =====
@@ Line 73: / Line 76: @@
 ====== Software ======
 Nothing done yet. Need to decide on the Hardware first
+Please implement [[http://en.wikipedia.org/wiki/Link_Layer_Discovery_Protocol|LLDP]] and you will make the NOC happy :)
+(Possible on all of the chips, simple ethernet protocol.)
 ===== Openbeacon Reader =====