Re: CLI 5476 with 2720 -9406 compatibility

[dr2@xxxxxxxx]

Jay, 

keep in mind that impedance matching is very important when working with
those things, so same thing on both ends is a big plus. 

/DR2

On 2022-08-28 14:14, Jay B wrote:

> for anyone interested -
>
> Getting two identical make/model baluns was the fix for getting the console
> working.  I wasted a couple weeks playing 52-pickup with mismatched baluns
> but I suppose that's the price of admission.  I'm glad to know the hardware
> was not damaged - the machine took a real beating during shipping.
>
> thanks everyone for your help with this!
>
> On Wed, Aug 24, 2022 at 9:48 PM Jay B <orcljsb@xxxxxxxxx> wrote:
>
> > Hello,
> >
> > I recently acquired a 9406-170 with a 2720 twinax controller and am
> > attempting to use it with a CLI 5476 terminal, but no success with the
> > terminal connectivity.
> >
> > IPL (01 A M - M as in Mary) shows C6004031 on the front panel after a few
> > minutes.  A little while later the amber LED lights up and another result
> > appears on the panel and some searching indicates the server gave up trying
> > to reach the console.  The console cursor stays in the upper right corner
> > and never moves.  If I use "01 A N" the machine appears to boot properly
> > (takes about a half hour for the disks to settle down).  I use the white
> > power button to perform a graceful shutdown (I've never yanked the power
> > cord).
> >
> > I have tried 2 4-port twinax blocks, one IBM and one Perle, connected to
> > the DB9 on the 2720 using RJ45 baluns.  I pressed and held the spacebar
> > while powering on the terminal and set it to use address 0 with 3476
> > compatibility.
> >
> > Is the CLI 5476 supported with the 2720 controller?  Maybe i'm trying to
> > do something that will never work but i've run out of ideas to troubleshoot
> > the issue.
> >
> > Any help would be greatly appreciated.