Question about check configure status for CEM+

Yang,

It turns out that this is a feature by design.  There is a chip in the backplane that contains a copy of some of the basic configuration information and acts accordingly when a CEM+ is cahnged out.

For a 1 rack system, the backplane chip contains a copy of the entire configuration and will ask you if you want to use it when swapping CEM+s.

For a multi-rack system (such as you have configured), the backplane chip keeps a copy of the Group #, Rack #, and config checksum.  If you place the rack 2 CEM+ into the oven when it was configured for Rack 1, it will automatically change the #2 CEM+ to Rack 1.

To defeat this feature, simply remove the backplane chip.  It is the 8-pin DIP serial EEROM that you see in the front and middle of the backplane.

Let me know if that helps.

David

This feature is necessary for proper performance of a multi-rack system.

Without some way to determine the group, rack number and IP addressing of a given rack, it would be impossible to swap CEM+ out without reconfiguring them every time.

If the IC is removed or destroyed, you may see "Backplane Com Error" or "Backplane Fail" errors.

Thank to everone for your quick response .

David,  thank you let me this is the case. It has worked without any issues.

Richard, as you mentioned "without some way to determine group, rack number and IP addressing of a given rack .........."

Can you advise me,  How can I do it ?

my own way as follow:

First CEM+  (Group 1/Rack 1), IP 10.101.101.101; Sencond CEM+ (Group 1/Rack 2), IP 10.101.101.102;  all through the backplane.

After Use CEM+ web broswer load configure into it

Many thanks and best regards

Yang

I think you've misunderstood.

In any real system, each physical rack must know who it is. If a rack didn't know it was (eg) Rack 2, then putting the CEM+ from Rack 1 into that rack would instantly make that rack behave as if it was Rack 1.

A Test Oven also contains a backplane with the configuration IC, and can be configured so that the oven itself knows that it is Rack 1 or whatever.

CEM+ Processors do not know which rack they are - they each contain the configuration for the entire Group, and will load whichever section of that configuration they are requested to do so when they boot.

I think you've misunderstood.

In any real system, each physical rack must know who it is. If a rack didn't know it was (eg) Rack 2, then putting the CEM+ from Rack 1 into that rack would instantly make that rack behave as if it was Rack 1.

A Test Oven also contains a backplane with the configuration IC, and can be configured so that the oven itself knows that it is Rack 1 or whatever.

CEM+ Processors do not know which rack they are - they each contain the configuration for the entire Group, and will load whichever section of that configuration they are requested to do so when they boot.