hi jason, thanks for the temperature data and measurements.
were your temperature measurements in the standard roach2 enclosure? i think the VEGAS SFP+ PHY's are mounted differently and have different cooling than the standard roach2 enclosure. best wishes, dan On Fri, Dec 6, 2013 at 9:53 AM, Jason Ray <j...@nrao.edu> wrote: > Hi Rich, > > So far we haven't had any trouble with the SFP+ boards (8 total) in our > vegas machine. I guess they've been powered up continuously and in use for > around a year now. > > We were concerned about how warm the PHY chips run so I spent a little > time looking into it. The datasheet says: > > "For typical applications, the VSC8486 can be operated in an ambient > temperature environment of +80 degrees C with no airflow and without a > heatsink." > > It also states that the maximum specification for case temperature is 85C > (95C in one case). I used our IR viewer and noted that the case > temperature reached ~60degC on the bench and a little less on the ones in > the rack. > > I should note that the datasheet was for the VSC8486 so I had to assume > that the thermal specs are similar for the VSC8488, which is the actual > chip on the SFP+ mezz boards. > > Given all of that info, we elected not to put heat sinks on ours. > > Hope this helps, > Jason > > > > At 12:25 PM 12/6/2013, Rich Lacasse wrote: > >> Hi All, >> >> We've had a failure of an SFP+ board for no apparent reason. We've not >> put any work into trouble shooting except to isolate the failure to the >> SFP+ board, as opposed to a ROACH2 or optical transceiver. >> >> Has anyone else experienced failures? >> >> The two PHY chips on these boards run very warm whether or not they are >> transmitting data. We are considering putting heatsinks on them. Has >> anyone else been down this road already? Any other advice? >> >> Thanks, >> Rich >> > > >
