Hello All: I need some help clarifying the typical way that E1 lines are terminated at the customer premises in Europe.
It is my impression that when the network operator installs an E1 line, the network operator typically includes an NTP (Network Terminating point) that electrically terminates the E1 line. This device provides a loopback capability as well as a certain degree of isolation. >From a review of the E1 standards TBR 12 and TBR 13, it appears that these standards presume the customer TE will be connected to an NTP of the type I described above. TBR 12 and TBR 13 contain no provisions for line build-out to accommodate varying cable lengths, and they define the interface to the NTP as SELV. To summarize my question, for E1 interfaces on customer-owned TE in Europe, is the interface to the outside lines typically made through some sort of NTP device that provides some degree of isolation from the outside lines? Also, is the situation the same for primary rate ISDN? I'm not particularly concerned about whether the customer TE interface is SELV or TNV-1, since my planned interface will meet TNV-1 requirements anyway. My main concern is what degree of lightning protection (if any) will be required in order to provide high reliability in customer installations. Joe Randolph Telecom Design Consultant Randolph Telecom, Inc. 781-721-2848 (USA) [email protected] http://www.randolph-telecom.com <http://www.randolph-telecom.com/> ---------------------------------------------------------------- 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/listserv/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: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
