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From: rogers@ofc.Columbia.NCR.COM (H. L. Rogers)
Newsgroups: comp.sys.att,comp.unix.questions
Subject: Re: parallel printers driving distance on 3B2s
Message-ID: <117@ofc.Columbia.NCR.COM>
Date: 4 Mar 88 22:03:59 GMT
References: <57@vsi.UUCP> <1505@nis.NIS.MN.ORG>
Reply-To: rogers@ofc.UUCP (H. L. Rogers)
Distribution: comp
Organization: NCR Corp, E&M-Columbia, W Columbia, SC
Lines: 32
Keywords: parallel ports, AT&T 3B2, Centronics

In article <1505@nis.NIS.MN.ORG> pnessutt@nis.NIS.MN.ORG (Robert A. Monio) writes:
>In article <57@vsi.UUCP> friedl@vsi.UUCP (Stephen J. Friedl) writes:
>>     Has anybody had experience driving a parallel printer
>>any distance with a standard 3B2 PORTS card?  I know you're
>>not supposed to go very far but I wonder how far that is.
>>I am thinking about 30-40' or so....
>
>We originally had a 3B2-400 here and had our printer(s) connected in
>parallel.  The length of the cable was about 12 feet.  We found that
>
>Later, when we replaced our 3B2-400 with several NCR Tower 600's, we
>were faced with the problem of extending our printer lines to about
>200 feet.  We solved this problem by purchasing a several Parallel Boosters.

Parallel printer cables carry standard TTL logic signals, which can only
drive 12 feet of wire safely while maintaining adequate signal margins.

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