ASR9922 power module installation.

Answered Question
Oct 8th, 2013
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Hello expert,


If i had asr9922 with 4xpower module v.2 should i install all modules in single power shelf or each shelf each power module? What is pro and con?


Thanks,

Marit

Correct Answer by xthuijs about 3 years 10 months ago

Good question!


So eventhough the power shelves are "passive" there is an i2c bus on the modules that allows us to read the voltage, load etc.

that i2c bus is fed by the modules in the shelf.


Now, if I have only one module in the shelf and that module is unpowered, that means the i2c bus is not powered either, does that mean that there is a module, but not working, or is there no module present to start with, that state can't be derived.


So if you have say a need under a certain config for 4 modules. I would load them 2 on 2, this so the shelf is always powered and we can derive the ok/fail state properly of a certain module.

For power distribution it doesnt matter where the modules are, it is just for that module mgmt story that you would spread them out...


xander

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Correct Answer
xthuijs Wed, 10/09/2013 - 05:14
User Badges:
  • Cisco Employee,

Good question!


So eventhough the power shelves are "passive" there is an i2c bus on the modules that allows us to read the voltage, load etc.

that i2c bus is fed by the modules in the shelf.


Now, if I have only one module in the shelf and that module is unpowered, that means the i2c bus is not powered either, does that mean that there is a module, but not working, or is there no module present to start with, that state can't be derived.


So if you have say a need under a certain config for 4 modules. I would load them 2 on 2, this so the shelf is always powered and we can derive the ok/fail state properly of a certain module.

For power distribution it doesnt matter where the modules are, it is just for that module mgmt story that you would spread them out...


xander

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