I would suggest looking at ANSI T1.315. That is where at least SBC gets thier requirements for TP76200. Also Bell South requires operation from -20VDC to -56.7 for local powered remote devices.
Jim Jim Wiese NEBS Project Manager/Senior Compliance Engineer ADTRAN, INC. 901 Explorer Blvd. P.O. Box 140000 Huntsville, AL 35814-4000 256-963-8431 256-963-8250 fax [email protected] -----Original Message----- From: Joe Finlayson [mailto:[email protected]] Sent: Tuesday, November 19, 2002 3:28 PM To: '[email protected]' Subject: RE: 48Vdc tolerance Jack, -40VDC to -56.7VDC rings a bell. I believe I got the -40VDC (1 minute soak) as a worst case from the SBC TP76200MP document and the 56.7 is standard based on +5% of the -54VDC C.O. float voltage. I believe you'll also find the 56.7 value in SBC's doc as well. I can't say I can recall any other specs off the top of my head that go outside of these ranges, but someone else may be able to cite another standard. I shoot for -40 to -60. Thx, Joe -----Original Message----- From: [email protected] [mailto:[email protected]] Sent: Tuesday, November 19, 2002 2:41 PM To: [email protected] Subject: 48Vdc tolerance Has anybody any information on the required operating range for equipment with respect to -48Vdc power? I'm looking for Telcordia requirements outside of the NEBS requirements that apply. Thanks, Jack
