RE: 48Vdc tolerance
Hi Jack, You are correct, -40 to 57.5 at the battery plant. The ATT NEDs specification is the most conservative. You will find that they require you not operate below -39VDC (-40VDC at the battery plant). There is also some hysteresis built in to the Turn Back On threshold of -43V. You may want to take a look at the transport requirements in GR499 and GR 513 have the Telcordia requirements and objectives for digital transport systems. Have a Great Day! Dave Spencer -Original Message- From: nebs-appro...@world.std.com [mailto:nebs-appro...@world.std.com] On Behalf Of jmur...@quantumbridge.com Sent: Tuesday, November 19, 2002 2:00 PM To: nebs@world.std.com Subject: RE: 48Vdc tolerance I have all of the checklists and the widest range I found was -40 to -57.5Vdc. One of the hardware designers here recalls a Bellcore spec that included a range to -36Vdc. I haven't found it yet. If I do, I'll post it. Thanks for all of your responses, they all support the -40Vdc limit (so far). Jack -Original Message- From: Joe Finlayson [mailto:jfinlay...@telica.com] Sent: Tuesday, November 19, 2002 4:28 PM To: 'nebs@world.std.com' 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: jmur...@quantumbridge.com [mailto:jmur...@quantumbridge.com] Sent: Tuesday, November 19, 2002 2:41 PM To: nebs@world.std.com 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
Re: 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 Jack, Others will probably give you the proper references. I do not have them with me at this time. Practically speaking -48VDC equipment should operate with applied voltages of -46 to -56 VDC. Regards, Don -- Don R. House, Technical Representative
RE: 48Vdc tolerance
I have all of the checklists and the widest range I found was -40 to -57.5Vdc. One of the hardware designers here recalls a Bellcore spec that included a range to -36Vdc. I haven't found it yet. If I do, I'll post it. Thanks for all of your responses, they all support the -40Vdc limit (so far). Jack -Original Message- From: Joe Finlayson [mailto:jfinlay...@telica.com] Sent: Tuesday, November 19, 2002 4:28 PM To: 'nebs@world.std.com' 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: jmur...@quantumbridge.com [mailto:jmur...@quantumbridge.com] Sent: Tuesday, November 19, 2002 2:41 PM To: nebs@world.std.com 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
RE: 48Vdc tolerance
Jack, At the very least ATT, Verizon, and SBC have some specific requirements. You can download copies of the customer requirements at: http://www.curtis-straus.com/nebs.html Regards, Mary Wilson -Original Message- From: jmur...@quantumbridge.com [mailto:jmur...@quantumbridge.com] Sent: Tuesday, November 19, 2002 2:41 PM To: nebs@world.std.com 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
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: jmur...@quantumbridge.com [mailto:jmur...@quantumbridge.com] Sent: Tuesday, November 19, 2002 2:41 PM To: nebs@world.std.com 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
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
