Look on the last version of ITU-T G.703. IN this the clause to isolate the RX side was deleted. Bye Paolo
_________________________________________________ Paolo Gemma Siemens Mobile Communications S.p.A. PG MW ST EMC & Safety SS Padana sup. KM 158 20060 Cassina de' Pecchi (MI) Italy phone +39 02 9526 6587 fax +39 02 9526 6203 mobile +39 348 3690185 e-mail paolo.ge...@icn.siemens.it _________________________________________________ > -----Original Message----- > From: pfitzgib...@attbi.com [mailto:pfitzgib...@attbi.com] > Sent: Monday, September 23, 2002 8:00 PM > To: emc-p...@majordomo.ieee.org > Subject: coax grounding of E3/DS3 in the EU > > > Greetings all, > > I have a general question about E3/DS-3 in the EU. I > have heard that it is no longer necessary to isolate one > of the two Tx/Rx coax ports but can't find a definite > answer. I'd like to know if I can directly tie both the > TX and RX ports to chassis for intrabuilding only CO > lines. This would make EMI/EMC much easier to pass and > would get rid of the special AC coupling that would > otherwise be necessary. > > The only reason that I could ever understand for the DC > isolation requirements that used to be in place was to > prevent ground connections in IBN CO's or to eliminate > current on the shields due to differences in earth > potential between buildings. As neither of these really > apply, I really don't see why it should still be > necessary to provide the DC isolation (I have only > intrabuilding lines and most CO's are now CBN > installations). > > Does anyone know what the current status on this is? > > Thanks, > Patrick > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ > > To cancel your subscription, send mail to: > majord...@ieee.org > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
