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Community Member

SF-302-08P will not power 802.3af/at device

I'm trying to power a Ruckus 7982 Access point using a Small Business SF-302-08P switch.  Ruckus claims the AP is 802.3af and 802.3at compatible.  The switch reports an overload.

#sh power inline fast 5

  Port      Powered Device         State          Status    Priority   Class  

-------- -------------------- ---------------- ------------ -------- ---------

  fa5             2                 Auto          Fault       low     class0  

Time range:

Power limit: 15.400W

Port Status:               Port is off - Overload state

Overload Counter:          23

Short Counter:             0

Denied Counter:            0

Absent Counter:            0

Invalid Signature Counter: 0

Here's what Ruckus' description of the PoE behavior of the 7982:

The 7982 advertises itself as a Class 4 PoE device (as do other  enterprise class 3-stream APs), which is compatible with 802.3af and  802.3at switches.

802.3af switches re-classify a device with this  behavior as 802.3af Class 0 (15.4W), and the vast majority of 802.3at  switches classify it as 802.3at Type 1 (15.4W).

This  implementation is intentional as it maintains compatibility with both  802.3af and 802.3at switches, and allows the 7982 to support full  802.3at power (>15.4W with a future firmware upgrade to support LLDP,  if required).

Seems to me it should work.  I updated to 1.3.0.62 - no change.

Everyone's tags (1)
5 REPLIES
Hall of Fame Super Gold

SF-302-08P will not power 802.3af/at device

Wrong forum, post in "Small Business switches". You can move your posting with the Actions panel on the right.

Community Member

SF-302-08P will not power 802.3af/at device

Thanks.  Sorry.

Community Member

SF-302-08P will not power 802.3af/at device

Hello,

     I didn't fully finish reading this post but read enough were I feel like this should be able to help you out.

https://supportforums.cisco.com/thread/2165089

So pretty much this should work just fine though since the switch can for sure handle 15.4Ws. May be some configurations you need to check our or some changes you may need to make.

Hope that helps you out.

Thanks,

Clayton Sill.

Hall of Fame Super Gold

SF-302-08P will not power 802.3af/at device

No expert on SG-series switches, have you tried changing the cables?  Maybe one of the three pairs is faulty.

Community Member

SF-302-08P will not power 802.3af/at device

Thanks for the feedback.  That's a pretty interesting thread linked to by Clayton.

No, it's not the cable.  I tested it and tried another.  Same AP/cable comes up just fine on the Brocade on my bench.

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