Inline power for Cisco 4506

sandhills · ‎12-09-2014

Hello all,

I recently added POE series RJ45 blade to one of my 4506's in order to power some new Cisco WAP's. The modules are functioning nominally with exception to not getting inline power to any devices. Here's the skinny:

Here’s a snapshot of the inline power issue:

CORE-WH-4506#sh power detail

Power Fan Inline

Supply Model No Type Status Sensor Status

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

PS1 PWR-C45-1400AC AC 1400W good good n.a.

PS2 PWR-C45-1400AC AC 1400W good good n.a.

Power supplies needed by system : 1

Power supplies currently available : 2

Power Summary Maximum

(in Watts) Used Available

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

System Power (12V) 710 1360

Inline Power (-50V) 0 0

Backplane Power (3.3V) 0 40

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

Total 710 1400

Watts Used of System Power(12V)

Mod Model budgeted instantaneous peak out of reset in rese t

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

1 WS-X45-SUP6-E 260 -- -- 260 260

2 WS-X4448-GB-RJ45 120 -- -- 120 72

3 WS-X4648-RJ45V+E 92 -- -- 92 10

4 WS-X4448-GB-SFP 65 -- -- 65 50

5 WS-X4248-FE-SFP 53 -- -- 53 20

-- Fan Tray 120 -- -- -- --

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

Total 710 -- -- 590 412

Watts used of Chassis Inline Power (-50V)

Inline Power Admin Inline Power Oper

Mod Model PS Device PS Device Efficiency

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

1 WS-X45-SUP6-E - - - - -

2 WS-X4448-GB-RJ45 - - - - -

3 WS-X4648-RJ45V+E - - - - -

4 WS-X4448-GB-SFP - - - - -

5 WS-X4248-FE-SFP - - - - -

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

Total 0 0 0 0

Here’s a kick-out from trying to force the interface inline power:

*Dec 9 07:23:36.519: %ILPOWER-5-ILPOWER_POWER_DENY: Interface Gi3/47: inline power denied. Reason: Insufficient inline power, requested(32258) available(0).

What am I missing?

Leo Laohoo · ‎12-09-2014

Yes. Makes sense. You need to upgrade your 1400w Power Supply to something bigger. Here's the math:

       Total                   710         --        --        590         412

You've got a 4506 chassis and populated six out of seven slots. With six slot loaded, the line cards pull up to 710w from your Power Supply. Now if you look at the Data Sheet for the WS-X4648-RJ45V+E line card it states that this particular line card can support up to 48 ports running 15.4w (or 24 ports at 30w PoE). The product of 30w & 24 ports is 720. So if you add up 720 and 710 you get a sum of 1430 which is OVER your 1400w Power Supply. This is the reason why the line card is complaining.

It doesn't matter if you've got a WS-X4648-RJ45V+E line card and you're going to, for example, plug 10 APs. When the line card is loaded into the chassis, the line card will immediately "chop" or "slice" 720w off the power supply. This is how it works.

sandhills · ‎12-11-2014

Awesome. Thanks guys for the direction. I'm looking at 2800w power supply replacements now.

Ferdinand Guasque · ‎12-11-2014

Hi sandhills,

That great! have you spoken to your Cisco partner in purchasing it yet? I can help you look for a local Cisco partner that have the PSU available or check with your current Cisco partner. please send me an email at fguasque@cisco.com so i can help you further.

Thanks,,

Ferdinand Guasque

Ferdinand Guasque · ‎12-10-2014

Hi sandhills,

Leo is right you need a bigger power supply to sustain the watts of the line card. if you need the part number and order information on the power supply please feel free to send me an email at fguasque@cisco.com.

Thanks,

Ferdinand Guasque