Subject: Re: NTT
Date: Thu, 10 Sep 1998 14:18:23 -0600
From: Rod Larson <rod.larson@mts.com>
To: "Otsuka, Yutaka" <Yutaka.Otsuka@mts.com>

Yutaka,
Like I said maybe you should just try the processor section of the radisys.  Just
use the SCSI interface board that is in the NTT system now.  You will have to use
the 5 slot backplane vs. the 3 slot one that is normal.  A better idea.  Just change
the disk drive in the NTT system and then everything is set up to run scsi etc.
Then you can load the disk.  Then remove disk from that chassis and put in other
one.

Can you try a different GRES-II board ?   I really think this is the culprit cuz
this board does all of the digital I/O and that seems to make problem worse when we
do more digital I/O.
The GRES is an OLD MTS board and may not be quite fast enough getting off the VME
bus so the DSP sometimes collides w/ it.

Vertical response has a resonant compensator that is boosting the daylights out of
high frequency performance.  I would lower it so it does not have so much response
above 40 Hz.  You will have to re-measure the transfer function, but that does not
take long.  After looking at the STEX data, the vertical definitely has something
going on that is not too good.  So, I would kill the response of the vertical system
at about 40 Hz cuz really don't need much up there, even with scaling.

Otsuka, Yutaka wrote:

> Hello Rod-san,
>
> How are you doing? Today we tried measure actuator data by STEX. We
> noticed about spare chassis, I need scsi board for the Radysis to
> install the Windows NT. Do you have any spare? If you have would you
> send it to Japan? Or should I send it back to you? I haven$B!G(Jt tried(J
> spare chassis though. Anyway, yesterday we didn$B!G(Jt have sync error, but(J
> today around Five o$B!G(Jclock. It happened again. (J
> By the way, Vertical tuning has really strong boe string. I couldn$B!G(Jt(J
> get fine tuning. I will send it to you tomorrow.
> RGDS,
> Yutaka$B!!(JOtsuka(J
> l MTS Japan Customer Service dept.
> 03-3235-9962
> ( <mailto:Yutaka.otsuka@mts.com> Yutaka.otsuka@mts.com)
