[c-nsp] X6708-10G-3C compatible with 7604 chassis?

[Tim Durack]

Nor I, until one of my techs enlightened me :-)

According to our testing, if the switch says Full/Variable, you need to set
it to the Variable mode to get full cooling:

Note: on another FAN-MOD-4HS fan-tray the positions of the switch are
labeled "VARIABLE" and "FULL". The switch should be put in the "VARIABLE"
position.


On Fri, Mar 21, 2014 at 11:31 AM, Lobo <lobotiger at gmail.com> wrote:

> Wow I never knew about that switch.  Ours had the variable and full
> options and we moved it over to full.  The fan is definitely running at the
> higher speeds but I think there's a problem with the reporting.  The router
> still can't get the proper information from the fan module so it still
> thinks it's operating at 75 cfm.  Reboots don't help it at all and so the
> 6708 still thinks it doesn't have enough cooling capacity to start it up.
>
> My colleague made an interesting observation and that is that prior to
> inserting the X6708-10G-3C card the fan was operating correctly and
> reporting everything like this:
>
> fan-tray 1:
>   fan-tray 1 type: FAN-MOD-4HS
>   fan-tray 1 mode: Restricted-power
>   fan-tray 1 fan-fail: OK
> chassis per slot cooling capacity: 75 cfm
>
> Once the 6708 card is inserted, the fan module almost seems like it loses
> it's ROM information or something because it then reports like this:
>
>
> fan-tray 1:
>   fan-tray 1 type:
>   fan-tray 1 fan-fail: OK
> chassis per slot cooling capacity: 70 cfm
>
> This has happened twice now (once in the field and once in our lab).  I'm
> wondering if the insertion is somehow affecting the fan module?
>
> Jose
>
>
> On 3/21/2014 10:40 AM, Tim Durack wrote:
>
>> This might help you:
>>
>> In the Cisco 6504 E, on the FAN-MOD-4HS fan-tray there is a switch at the
>> rear. This switch should be in the "A" position. See Figure 2.1.1.
>> This allows the fan to run in high-power mode. In this mode it generates
>> an airflow of 100 ft3/min per slot.
>>
>> When the switch is in the "M" position it operates in the
>> restricted-power mode and generates only 75 ft3/min per slot. The
>> WS-X6716-10GE line card has a cooling requirement of 84 ft3/min. In this
>> case it could prevent the line card from powering up.
>>
>> Note: on another FAN-MOD-4HS fan-tray the positions of the switch are
>> labeled "VARIABLE" and "FULL". The switch should be put in the "VARIABLE"
>> position.
>>
>>
>> On Fri, Mar 21, 2014 at 9:49 AM, Lobo <lobotiger at gmail.com <mailto:
>> lobotiger at gmail.com>> wrote:
>>
>>     Agreed.  But even after a reboot, the chassis is still not
>>     allowing this 6708 card to come up because it complains about
>>     insufficient cooling.
>>
>>     This is pretty annoying as their documentation shows that the 7604
>>     is compatible with this card but now we're starting to wonder if
>>     that's truly the case.
>>
>>     Jose
>>
>>
>>     On 3/21/2014 9:42 AM, Phil Mayers wrote:
>>
>>         On 21/03/14 12:15, Lobo wrote:
>>
>>             Even though the cards are not completely compatible for
>>             totals # of
>>             routes (3C vs 3CXL) the system should default to the
>>             lowest card but I
>>             would think that it would still power up the card and let
>>             it function
>>             normally.
>>
>>
>>         No; the PFC/DFCs must all match. The other PFC/DFC need to be
>>         *downgraded* to non-XL mode, and that need a chassis reboot.
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>>
>>
>> --
>> Tim:>
>>
>
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-- 
Tim:>