Date: Thu, 19 Oct 1995 13:25:47 -0400 From: dennis@etinc.com (dennis) To: Joe Greco <jgreco@brasil.moneng.mei.com> Cc: hackers@freebsd.org Subject: Re: Bragging rights.. Message-ID: <199510191725.NAA27921@etinc.com>
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>16550's - free essentially because no serious hacker will buy 16450 serial >ports. For the 16550-impaired, you can get a *good* card (STB DSP-550) with >two 16550's for around $31 wholesale, including a bidir parallel port. > >The Motorola terminal adapters we use (UTA-220's) can do both sync and >async. Never tried the sync. You can find less expensive terminal adapters >that only do async. The UTA-220's were around $650 I believe when purchased >some time ago. Things like Bitsurfers should be in the <~$400 range. > >All else being equal, I would agree that the ET/502* solutions are a nice >way to go, but there are downsides: > >1) The ET/* board is at least $500 more expensive than a comparable 16550 > solution. >2) Typically you have to run sync at both ends of the link. Many ISP's > will charge you more if you burn one of their valuable sync serial > router ports, but could care less about the cheaper async terminal > server ports - this can be a difference of up to a few hundred bucks > per month! >3) A terminal adaptor that does sync _may_ be more expensive. > Actually the bitsurfers can be gotten for well under $300. and our ET/5025 with RS-232 interface is $400. So you're talking under $700. for a lot more bandwidth and none of the async CPU overhead. Plus if you wanted to go to 56k or frame or frac T1 you'd already have your adapter card. Dennis ---------------------------------------------------------------------------- Emerging Technologies, Inc. http://www.etinc.com Synchronous Communications Cards and Routers For Discriminating Tastes. 56k to T1 and beyond. Frame Relay, PPP, HDLC, and X.25
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