Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!apple!motcsd!hpda!hpcupt1!hprnd!hprmokg!barry
From: barry@hprmokg.HP.COM (Barry Fowler)
Newsgroups: sci.electronics
Subject: Re: want help with power supply
Message-ID: <10040006@hprmokg.HP.COM>
Date: 7 Jul 89 00:26:18 GMT
References: <113785@sun.Eng.Sun.COM>
Organization: HP Networked Computer Mfg. Operation
Lines: 5

pf is probably Power Fail, a signal issued when a comparator detects that
the power output is about to be interrupted in ?-milliseconds.

As for sn, I don't know (possible "sense" for a voltage or current
sense??)