[SI-LIST] Gigabit Ethernet Magnetics
- From: "SI List" <si-list@xxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sun, 29 Feb 2004 17:30:00 +0100
Hello all!
I have two questions about 1000BASE-T Gigabit Ethernet Magnetics:
1) Transformer configuration
----------------------------
There are at least 3 configurations which are commonly used. Some use
one, two or even three transformers per pair.
Is it a price/performance trade-off?
Which configuration should be used in which application? My application
would be a Gigabit Ethernet switch. I couldn't find this information
from the manufacturers.
2) Transformerless Ethernet
---------------------------
Why is a transformer actually required?
I have read information that AC coupling with a 0.1uF ceramic capacitor
also works (as in Fiber Channel, Infiniband, etc.).
The only reason I can see is the 1500V isolation. Is this a regulatory
requirement? Why is this requirement not imposed on Infiniband, etc.?
I am new to this field. Any information is appreciated.
Is there a good book, or papers, or web pages which would be helpful to
me?
Best regards,
Martin
--
Enclustra GmbH Email: heimlicher // enclustra \\ com
Martin Heimlicher Phone: +41 43 3431943
Wibichstrasse 10 Fax: +41 43 3431944
CH-8037 Zurich, Switzerland Mobile:+41 79 2798183
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