[SI-LIST] Regarding: Usage of Magnetics...
- From: "karthick.murugan" <karthick.murugan@xxxxxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sat, 26 Dec 2009 17:38:43 +0530
Hi All,
I just need to clarify a small doubt on the usage of magnetics,
Whenever we are using Ethernet switch IC we should provide the magnetics to the
ports at the chip side.
Due to some reason like signal balancing, common-mode rejection, impedance
matching, and EMC improvement.
Consider, I am using one processor board and the respective rear board,
In that the magnetics outputs (twisted pair) are coming from the processor
board, and it could be connected with the Ethernet switch IC that one I used in
rear board through the rear connectors,
In Ethernet switch datasheet they mentioned all the ports should connect with
primary side of the magnetics.
My doubt is whether we could provide one more magnetics (because already
magnetics was given in processor board, that output is coming from the
processor board to rear board side)
to the ports of Ethernet switch IC, then connect to the processor side
magnectics output, or there is no need of magnetics, if the magnetics is not
need for that case tell me reason.
Best Regards,
Karthick.M
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