Date: Sun, 22 Oct 1995 23:38:33 -0400 (EDT) From: Kim Culhan <kimc@w8hd.org> To: dennis <dennis@etinc.com> Cc: hackers@FreeBSD.ORG Subject: Re: Bragging rights.. Message-ID: <Pine.BSF.3.91.951022225503.25841O-100000@w8hd.w8hd.org> In-Reply-To: <199510230300.XAA08508@etinc.com>
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On Sun, 22 Oct 1995, dennis wrote: > > > >I've been using a pair of Adtran ISU128's for some time, they do both > >sync and async; I'm not tellin' which I'm using :) > > > >I do have one complaint though. The async interfaces have TTL voltage > >levels though they supply these little 'adapters' labeled to > >suggest they convert the RS530 async. connections to RS232. > > > > They can't exactly do this, because EIA-530 is synchronous RS-422 (balanced) > and RS-232 is unbalanced, so they have to do signal conversion. They > probably default to RS-232 for async and run EIA-530 for sync. I doubt if > RS-232 would work at RS-422 levels at higher speeds as RS-232 is only > spec'ed for 20k anyway. Its async with TTL voltage levels. > > Dennis > ---------------------------------------------------------------------------- > Emerging Technologies, Inc. http://www.etinc.com Right. Thats my point, they may not work at _all_ connected just to any 'RS232' device. They will work with some 'typical' RS232 interfaces. They're very good units, what with their v.35 interfaces, very flexible. When we took these out of service from the v.35 interfaces, we wanted to put 'em back in service using more common async. ports in another application but..lets just say I was sold these units by a certain Florida reseller who didn't return my call[s] about this issue; caveat emptor. I still like 'em alot, the designers didn't get to choose the sales organization. regards kim -- kimc@w8hd.org
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