Thank you, Joe. That confirms my experience to date. However, I have a product design engineer claiming earthing of one of the conductors at the output of the bulk ring generator is typical. Earth referencing, in my experience, typically occurs near the individual T/R interfaces, just before ring trip circuitry.
Regards, Peter L. Tarver, PE [email protected] > From: Joe Randolph [mailto:[email protected]] > Sent: Thursday, January 26, 2006 8:54 AM > > On 1/26/2006, Peter Tarver wrote: > > I am in the process of a product review that I require > clarification on > whether or not bulk ring generator outputs that supply > other equipment > are typically earthed, unearthed or a mixed bag. > > > Hi Peter: > > I believe that the way this is typically implemented in the > CO is to build a bulk ring generator that has a floating AC > output. One side of the output is tied to the -48 VDC > battery, and the other side becomes the bulk ring that is > bussed to the line cards. So, this bulk ring signal is > indirectly tied to ground via the -48 VDC battery. > > > Joe Randolph > Telecom Design Consultant > Randolph Telecom, Inc. > 781-721-2848 (USA) > [email protected] > _____________________________________________________________________________ Scanned by Sanmina-SCI eShield _______ _____________________________________________________________________ - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
