-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Mikkel L. Ellertson wrote: > It is supposed to be uninterpretable, but in practice, low end UPSs, > especially the ones sold for home or home offices, have a changeover > time when AC fails. many low ends may be, but biggest problem with low ends are that they do not supply true sine wave output. hook up a o-scope and you will see a flat line at top and bottom of wave. very hard on any system with a transformer. > It is only a cycle of so, but it is there. They are > not designed to be providing continuous AC. These units should properly > be called a battery backup, and not a UPS, but you know how marketing is. any time i meet a new client who is using a cheep 'ups' system, first thing i do is explain why they need to make change to a true ups and transtector suppression on both mains and lan lines including telco. had one tell me he did not feel need for protecting cat wiring because there had never been lightening problems in his area. about 6 months later, a small bolt made a direct hit near center of his building, thru roof to electrical conduit. luckly, some how, it did not get mains. problem was it did induce enough to put a spike in lan cat wiring and knocked out 2 x8 routers and 5 nic's. replaced routers with a x16 router and put a transtector acp100 on mains and 3 tsj45's on router input, his and cpa's line. he figured if any of other systems ever got fried, he would just put in new systems. lan system is still up and is lucky not having any more strikes. - -- tc,hago. g . without fences, who needs gates. - --. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (GNU/Linux) Comment: Using GnuPG with Mandriva - http://enigmail.mozdev.org iD8DBQFIG5oKQCGYa6nWX2MRArHyAKCyATSO2Ku3JTXlhxb2Ot8nHng91ACgta7s vVV0HsNEnCbULckoITmONfc= =sBOy -----END PGP SIGNATURE----- -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
