Mike, Scott is correct in his response but you may want to consider AT&Ts requirements which are entitled "NEDS" (no typo, it stands for Network Equipment Development Standards) if they are a potential customer. Req. 1.2-20 states:
"Each element/shelf/circuit pack, whichever is the smallest independent load device of the NE, shall obtain power from two completely independent power units..." Depending on your product architecture, this requirement may not apply. I'd recommend reading the entire document to get a better understanding of the intent. You can find NEDS at: http://world.std.com/~csweb/nebs.html. Cheers, Marko Radojicic email: ma...@caspiannetworks.com phone: 408/382-5206 fax: tbd -----Original Message----- From: Scott Baer [mailto:ba...@agcs.com] Sent: Tuesday, September 12, 2000 3:14 PM To: nebs@world.std.com; michael.prus...@spikebroadband.net Subject: Re: NEBS redundancy requirements Mike, I don't believe that you'll find any requirement in GR-63-CORE or GR-1089-CORE for dual-redundant power supplies. What you probably have is a specification specifying a "High Availability" system, which is often associated with the near-100% uptime that is expected of telecommunications facilities. The benefit of dual-redundant power is that it removes one opportunity for a single-point failure from your equipment shelf. NEBS is frequently required of telecommunications equipment if it is either (1) purchased by Bell South, SBC, Qwest, or Verizon, and/or (2) be placed in one of their central offices by a co-locator. So, NEBS and "High Availability" are often mentioned in the same breath. However, NEBS doesn't dictate your power supply architecture as to whether it is redundant or not. You may find it more cost-effective in some applications to consider a single high-MTBF power supply. Scott Baer ====================== Scott J. Baer, P.E. Product Compliance Engineer AG Communication Systems A Subsidiary of Lucent Technologies Michael Prussel wrote: > Greetings all - > > A question has come up regarding the need for dual-redundant power supplies > residing within a Compact PCI system chassis. One of our people claims this > feature ties to NEBS compliance. > > Is there a specific NEBS requirement(s) that would dictate dual redundant > power supplies? If so, where can I find it? > > Would a single high-MTBF power supply be an alternative way to meet such a > requirement? > > Thanks very much for your help. > > Mike Prussel > Regulatory Engineer > Spike Broadband Systems > Nashua, NH > michael.prus...@spikebroadband.net
