RE: Question on Perle 494 Control Unit/Communications... -- MIDRANGE-L

Chuck,

Opinions are always free.... :)

Any feedback on Larry's comments (i.e. a switch or something not
on UPS)?

It's amazing how slow x494's take to reboot (I prefer antiquated 5394's),
so if terminals activated quickly when power was restored, the Perl was
probably trying to "bind" with the host the entire time.    

BTW:
 
It's been several years since I worked with SNA however, the underlying
LU6.2 protocol uses simple EVOKE, INVITE and DETACH-like verbs at the
physically layer. That said, if the Perl failed to normally "detach"
from the connection, you would receive failure messages on QSYSOPR,
as you probably did.  Terminals and printers, on the other hand, use
a different "PU" (physical unit) protocol that is independent from the
LU6.2 session managed by the x94.  So, in addressing your original post,
it's unlikely the Perl manages the LU6.2 session based on the availability
of attached devices.

Again, just my opinion(s).

Regards,

Michael Rooney             


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Chuck Lewis
Sent: Monday, June 14, 2004 10:39 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: Question on Perle 494 Control Unit/Communications...


Well you are entitled to your opinion Michael :-) but it DEFINITELY happened
that way. I double checked with the folks at the site and they touched
ABSOLUTELY nothing (there are only a couple of folks that know anything
about the wiring closet, it is not easy to get to, etc. and they did
nothing...) The Perle IS on an APC UPS and the UPS shows it stayed up during
the outage. And as I noted, they had dumb terminal sign-on screens almost
instantly once the power was restored to those devices, and if you work with
this diskette based Perle units, you know there is NO WAY they boot up that
quickly :-)

Chuck

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Rooney, Michael P
Sent: Friday, June 11, 2004 2:09 PM
To: Midrange Systems Technical Discussion
Subject: RE: Question on Perle 494 Control Unit/Communications...

Chuck,

I seriously doubt that the Perl or any other x94 controller does what
you think it did.  As 5x94 controllers use SNA/LU6.2, they connect with
the AS/400 regardless of the status of it's attached devices.  Are you
100% certain that the Perl had power at this time?

BTW:

To test your theory try powering off all the local devices.  

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of Chuck Lewis
Sent: Friday, June 11, 2004 2:59 PM
To: 'Midrange Systems Technical Discussion'
Subject: Question on Perle 494 Control Unit/Communications...


Hi Folks,

 

We had our largest distribution center down this morning for about 30
minutes - no power.

 

We use a frame relay network. Adtran DSU/CSU, Cisco Router, Perle Control
Unit w/Ethernet card, Netgear Switch and APC rack mount UPS.

 

While they were without power I could ping the Cisco Router, telnet into it,
etc. but I could not successfully ping the Perle Control unit. Get the
Controller Failed messages on QSYSOPR, etc.

 

So not being a communications guru by any stretch, but does the Perle "poll"
for responding devices to keep it's connection alive or something ? Reason I
ask is that the minute they got power back to the devices there were back up
and they touched absolutely nothing in the wiring closet.

 

Thanks !

 

Chuck

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