As we all know, 100BT uses 2 pairs, one for Tx, one for Rx.
One of the reason they were able to squeeze 1GB on Ethernet was by using all 8 conductors.
So, if I have a Gigabit LAN with VoIP phones, how is the power delivered to the SIP phones if all conductors are used already?
TIA,
-Ramon
The standard specifies several modes, one of which is shared signal and power, but I haven't seen anybody run in this mode. All I've seen is power over the unused pins after the two ends negotiate what mode they'll be in.
Most often, you get 10/100 and PoE connections. Gigabit has to be handled seperately out to the desktop.
Evening Ramon;
More info than you probably wanted to know:
This box does POE on 1000base-T according to 802.3af:
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