-46vdc to -56vdc with an average float of -52vdc in my 30+ years of Bell System experience.
Personally, I have never seen a C.O. voltage higher than -54vdc nor lower than -48vdc. (Except for a special -72vdc buss for range extension that is no longer used.) Don Don Robert House, MTS Excelsus Technologies, Inc. (760) 476-1511 Office (760) 476-1519 FAX (760) 420-3016 Cellular URL: http://www.excelsus-tech.com -----Original Message----- From: Doug [mailto:dmck...@gte.net] Sent: Thursday, June 08, 2000 9:33 AM To: Nebs Discussion Group Subject: The -48VDC CO rail ... Two questions ... 1. Would anyone care to relate personal experiences, anecdotes, concerning the stability or non-stability of the -48VDC rail in a CO? Just how bad is it? 2. I think I'm finally understanding the meaning of the upper Bellcore range of 56 vdc. UL testing would require +6% above 56 which puts it right at 60VDC. Any change increasing the upper limit in the spec would push the voltage into the hazardous voltage area ( >60VDC ) changing all the test limits. Do I have that correct? Where'd the lower Bellcore voltage spec some from? Regards, Doug McKean
