Cable modem is no different than a DSL modem, right? ;) If it's an eMTA, it may have battery backup, though the operational default is to disable the Ethernet port after a few minutes to provide the maximum amount of dial-tone.
Frank -----Original Message----- From: Owen DeLong [mailto:o...@delong.com] Sent: Monday, December 27, 2010 12:05 AM To: frnk...@iname.com Cc: NANOG; Jared Mauch Subject: Re: Muni Fiber Last Mile - a contrary opinion On Dec 26, 2010, at 7:35 PM, Frank Bulk - iName.com wrote: <snip> >>> You are likely already at the mercy of some local hut for your dialtone. >> Very few things home run to the co these days. It's unlikely any hut has >> more than 24 hours of battery. >>> >> I know this is true where FTTN overlays have been built. However, in the >> majority of California, at least, that is still more the exception than >> the >> rule and there is usually a Cat-3 Copper home-run for local dialtone. > > [Frank Bulk] > Here in the midwest each and every of the telcos that I've talked to or > worked with feeds dialtone for their DSL customers from the same equipment > that serves the DSL. To do otherwise would require a splitter shelf in each > node. > In California, that is, by and large, the CO. <snip> >> However, 24 hours of dialtone after something happens still exceeds the >> average cablemodem duration after the >> power flickers. > > [Frank Bulk] > Some MSOs (including ourselves) have power systems (e.g. Alpha) in place > throughout the plant to provide backup power for at least some time. > Does that back up the cablemodem in the residence? If not, game over. Owen
