[cisco-nas] Problems with digital modems (NM-xDM)

[Aaron Leonard]

Hi Ahmad,

>
> thanks for your reply. Your assumption is correct. I used
> the mica modems.
>
> Yet another question
> What happens, if one module fails ?
> Could one module influence the other modules so that they
> fails too ?
>

It is possible that one module could affect others ...
since they are on a shared bus, if one is misbeving,
it could cause others to crash.

Aaron

---


> Regards,
>  Ahmad
>
>
> Aaron Leonard wrote:
>
>> Ahmad,
>>
>> I assume that you are referring to either MICA HMMs or DMMs
>> (6- or 12-port modules) of different hardware revs on the
>> same carrier card/NM or to NextPort CSMV/6 modules of
>> different revs on the same DFC.
>>
>> In the case of MICA, this would definitely be supported
>> as HMMs and DMMs are FRUs (field replaceable units.)
>> CSMV/6es are not FRUs on NextPort DFCs however so
>> I would think it would be quite odd to see different revs
>> within the same DFC.
>>
>> Regards,
>>
>> Aaron
>>
>> ---
>>
>>>
>>> I have a question regarding to digital modems.
>>> Is it possible to mix different modem hardware versions on
>>> one Network Module ?
>>>
>>> We have a network module with different versions on it. The digital
>>> modems functioned properly for aproximately 2 days, after that
>>> one after another was marked as bad. A normal reload was not enough
>>> to re-enable the modems. We had to power off the router in order
>>> to re-enable them.
>>>
>>> I'am not sure, whether the problems with this modems relate to the
>>> different hardware versions on the network module.
>>> Perhaps there is only a hardware failure.
>>>
>>> We have on other access-router with digital modems no problems.
>>> The difference to this network module is that the digital modem
>>> hardware version on the other one are all the same.
>>>
>>> Could this be the reason ?
>>> Any hints ?
>>>
>>> regards,
>>>  Ahmad
>>>  
>>>
>>
>
>