Here's your answer to the grounding issue. There should be no ground path through the Customer Installation that might cause current flow if the ground of a Central Office is different than the ground to which equipment on the customers premise is connected.
Note 1: CI = Customer Installation is defined as everything connected to the carrier line at the Network Interface or Demarcation point. That includes all building wiring in most jurisdictions, as well as the apparatus connected to that wiring. Note 2: Central Office refers to the central telephone exchange operated by the service provider. ---------- Forwarded Message ---------- From: Bill Buckley, INTERNET:[email protected] TO: Victor Boersma, VBoersma DATE: 10/9/97 2:02 AM RE: Re: Looking for a Standard ... Vic: There were no grounding standards specifically for T1(DS1), but T1Y1 and later T1E1 did write a standard on grounding and bonding in general. And consideration was given when writing the connector catalog in T1E1.3 that required that there be no ground path through the CI that might cause current flow if the ground of a central office is different than the equipment on the customers premise. Sorry...best I can do. Bill B >Doug, > >I was part of the formulating group that wrote the T1 Interface standard >and chair >of the Committee that wrote the PBX standard when the T1 interface was >added >to that standard. > >In all that work, I don't remember this ever coming up, I guess, because we >were >writing Interface Standards, not Product Standards in North America. > >I may be wrong, but I don't think there is a standard that describes these >alternatives. > >I am copying Bill Buckley on here, as he was chair of more things than he >remembers AND is one of the most astute technical people in this regard. >Maybe he can set me straight (on this issue only). > >Ciao, > > >Vic > > > > >> Is there a standard out there that specifies three >> secondary grounding schemes for T1 equipment? >> >> The three configurations are: >> 1. Secondary ground connected to chassis ground, >> 2. Secondary ground NOT connected to chassis ground, >> 3. Secondary ground connected to chassis ground >> through a resistance. >> >> Regards, Doug >> Willam J. Buckley Director of Technical Standards ITRON PO BOX 15288 SPOKANE, WA 99215 509-891-3744 FAX:509 891-3590 EMAIL: mailto:[email protected] Home email: mailto:[email protected] Home Phone: 509-922-1676 For More Information on ITRON see our WEB page http://www.itron.com
