Mailing List Archive: Problems with digital modems (NM-xDM)

Problems with digital modems (NM-xDM)

Mar 11, 2005, 12:26 AM

Post #1 of 4 (1478 views)

Hi!

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
--
Ahmad Cheikh-Moussa
NetUSE AG
Dr.-Hell-Straße, 24107 Kiel, Germany
Telefon: +49 431 2390 400 -- Telefax: +49 431 2390 499
Service: Service@NetUSE.DE -- http://NetUSE.DE/

Re: Problems with digital modems (NM-xDM) [ In reply to ]

Aaron at Cisco

Mar 11, 2005, 11:02 AM

Post #2 of 4 (1406 views)

Permalink

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
>
>

Re: Problems with digital modems (NM-xDM) [ In reply to ]

acm at netuse

Mar 14, 2005, 2:59 AM

Post #3 of 4 (1404 views)

Permalink

Hi Aaron,

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 ?

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
>>
>>
>

--
Ahmad Cheikh-Moussa
NetUSE AG
Dr.-Hell-Straße, 24107 Kiel, Germany
Telefon: +49 431 2390 400 -- Telefax: +49 431 2390 499
Service: Service@NetUSE.DE -- http://NetUSE.DE/

Re: Problems with digital modems (NM-xDM) [ In reply to ]

Aaron at Cisco

Mar 14, 2005, 11:11 AM

Post #4 of 4 (1435 views)

Permalink

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
>>>
>>>
>>
>
>