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 <loboti...@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 <loboti...@gmail.com <mailto: >> loboti...@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. >> _______________________________________________ >> cisco-nsp mailing list cisco-nsp@puck.nether.net >> <mailto:cisco-nsp@puck.nether.net> >> >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> >> >> _______________________________________________ >> cisco-nsp mailing list cisco-nsp@puck.nether.net >> <mailto:cisco-nsp@puck.nether.net> >> >> https://puck.nether.net/mailman/listinfo/cisco-nsp >> archive at http://puck.nether.net/pipermail/cisco-nsp/ >> >> >> >> >> -- >> Tim:> >> > > _______________________________________________ > cisco-nsp mailing list cisco-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > -- Tim:> _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/