If rated for 1 or 2kV, this could be the ESD discharge cap that is typically between 'ground' and power that is located directly on the RJ45 port. If the cap is used with ferrite beads, then probably for noise decoupling. Later designs tend to not use caps on secondary side of xfmr because the commonly used TVSs can have significant capacitance, but many designers still like to put those little guys everywhere.
Remember an Intel MB design guide that had section on gigabit interface - recommended. Brian From: Grasso, Charles [mailto:[email protected]] Sent: Tuesday, November 11, 2014 10:50 AM To: [email protected] Subject: [PSES] Gigabit Ethernet Magnetics configuartion question Hello, I have seen schematics of Gigabit Ethernet connectors that have the CTs on the input side connected to VCC and then to GND with a 0.1uF cap as a "decoupler?" across the connections. I have no experience with sort of configuration other than to think "it must be OK because gigabit has been out for a while". I would appreciate someone sharing any "gotchas" that they have seen using this type of connector. Is this design unique or is it specified by a standard ..or.??? Thanks in advance! Best Regards Charles Grasso Compliance Engineer Echostar Communications - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
