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From: rjn@hpfcso.HP.COM (Bob Niland)
Newsgroups: comp.sys.hp
Subject: Re: Telebit T2500 <-> HP 9000/825
Message-ID: <7370099@hpfcso.HP.COM>
Date: 8 Mar 90 00:07:16 GMT
References: <1990Mar7.162518.8509@pmsmam.uucp>
Organization: Hewlett-Packard, Fort Collins, CO, USA
Lines: 18

re: > What is the correct cabling for connecting a Telebit (T2500) to a 
    > 6-channel MUX on an 825?  (MUX is HP98196A aka 27140A).

The pin-outs on the 27140A MUX are dual-function DCE/DTE.  They are wired to
look like a DCE, with the missing DTE functions on otherwise unused pins.

For direct connection of DTE devices (e.g.terminals, printers, etc.), you
use a 1-1...25-25 straight-thru cable, such as an HP 40242M.

For connection of DCE devices (e.g.modems), you need a special cable that
brings the hidden pins to life.  It is ordered as product number 92219Q.

If you want to make your own cable, I suspect someone can post the pinouts.
I can't find my copy from the last time this came up....

Regards,                                              Hewlett-Packard
Bob Niland      rjn%hpfcrjn@hplabs.HP.COM             3404 East Harmony Road
                UUCP: [hplabs|hpfcse]!hpfcla!rjn      Ft Collins CO 80525-9599