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From: msjohnso@ensub.Wichita.NCR.COM (Mark Johnson)
Newsgroups: comp.periphs.scsi,comp.sys.ibm.pc,comp.unix.xenix,comp.unix.i386
Subject: Re: Adaptec 154xB SCSI host adapter (was: Re: WD SCSI Controller)
Summary: SCSI Bus Cable Length
Message-ID: <331@ensub.Wichita.NCR.COM>
Date: 15 May 90 13:44:29 GMT
Article-I.D.: ensub.331
References: <1922@lakesys.lakesys.com> <3906@thebes.Thalatta.COM> <17908@well.sf.ca.us>
Organization: NCR Corporation, Wichita, KS
Lines: 23

In article <17908@well.sf.ca.us>, feustel@well.sf.ca.us (David Alan Feustel) writes:
> Does anyone know the maximum permissable
> length for single-ended SCSI cabled bus?

From the SCSI standard, X3T9.2:

4.2.1 Single-Ended Cable.  A 50-conductor flat cable or 25-signal twisted-
pair cable shall be used. The maximum cable length shall be 6.0 meters.

A stub length of no more than 0.1 meters is allowed off the mainline
interconnection within any connected equipment.

SCSI bus termination may be internal to the SCSI devices that are at the
ends of the cable.



Note: The 6 meters (20 ft) length is the TOTAL length of all SCSI cable,
should you happen to have more than one device. Good luck!
-- 
Mark Johnson      WB9QLR/0      NCR Peripheral Products Division
Mark.Johnson@Wichita.NCR.COM    3718 N. Rock Rd.
(316) 636-8189    NAR #14025    Wichita, KS  67226