Date: Tue, 5 Feb 2013 17:44:20 +0100 From: CeDeROM <cederom@tlen.pl> To: chrish@ultimatedns.net Cc: freebsd-stable@freebsd.org, Karl Denninger <karl@denninger.net> Subject: Re: So I whip out a FTDI-based multiport Serial USB Adapter.... [SB QUAR: Tue Feb 5 10:15:47 2013] Message-ID: <CAFYkXj=dSt7hEfGg31ZQdDuqAtM4BKtB-%2Bx5KuZOHGmb_44M=w@mail.gmail.com> In-Reply-To: <3af8b2a2d655b0ed501c01e30d00ff0a.authenticated@ultimatedns.net> References: <511004AA.3060201@denninger.net> <1360008362.93359.485.camel@revolution.hippie.lan> <511020DB.3050302@denninger.net> <1360012382.93359.489.camel@revolution.hippie.lan> <66CBAB45-621B-47F8-AC67-64F816AFE837@bway.net> <1360015226.93359.502.camel@revolution.hippie.lan> <DF3A3AF5-6B74-4D01-9B2E-A1C900540722@bway.net> <51107662.8050708@denninger.net> <51107D82.8040605@denninger.net> <51108DB0.7050403@denninger.net> <bff299b8dda6a83befb45c67ad905944.authenticated@ultimatedns.net> <51113242.4060003@denninger.net> <3af8b2a2d655b0ed501c01e30d00ff0a.authenticated@ultimatedns.net>
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On Tue, Feb 5, 2013 at 5:27 PM, <chrish@ultimatedns.net> wrote: > Understood. I was referring to the _computers_ power supply. :) Still it may be caused by some issued on the USB bus power management. Normally an USB port can supply 500mA of current. Above that port should be disabled by the host if I remember correctly. If there is a hub inside the serial port adapter it would be good to know it it is powered directly from the USB port or does it have its own power supply... There could be too much power drain from the USB port by external devices attached to the hub/adapter. But this would be rather obvious. There may be some misunderstanding between USB Host and the self powered USB device, so they cannot agree on the power supply level, which seems more probable :-) -- CeDeROM, SQ7MHZ, http://www.tomek.cedro.info
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