11n POE requirements

Answered Question
Jun 23rd, 2008

Hi All

are there any Special POE requirements for the 802.11n Access points.

Thanks in Advance

I have this problem too.
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Correct Answer by rob.huffman about 8 years 5 months ago

Hi Tau,

Hope all is well :)

Yes, the 1250 series (with dual radios) does require a "higher" PoE (18.5 W) than any other AP;

Q. What are the powering options for the Cisco Aironet 1250 Series? Is the Cisco Aironet 1250 Series 802.3af-compliant?

A. The Cisco Aironet 1250 Series Access Point may be powered by a Cisco Ethernet switch, a power injector, or a local power supply.

The Aironet 1250 Series Access Point with one RM1252 radio module installed requires 12.95W, which is within the 802.3af Power over Ethernet standard. Any Cisco switch supporting 802.3af may be used to power the Aironet 1250 Series Access Point with one RM1252 radio module installed.

Beginning late 2007, Cisco will enable auto-negotiating, single-port power for the Aironet 1250 Series access point on leading switches across the Catalyst portfolio. This unique, integrated solution provides the full power requirements for dual radio modules and eliminates the need to run an additional cabling drop or insert a separate power injector.

The Cisco Aironet 1250 Series Access Point may also be powered remotely using a Cisco Aironet Power Injector (AIR-PWRINJ4) or locally using a power supply (AIR-PWR-SPLY1).

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6973/ps8382/prod_qas0900aecd806b7c82.html

Powering Options

• Cisco Catalyst switch port capable of sourcing 18.5W or greater

• Cisco AP1250 Power Injector (AIR-PWRINJ4)

• Cisco AP1250 Local Power Supply (AIR-PWR-SPLY1)

• 802.3af switch (AP1250 with single radio only)

Power Draw

• AP1250 with two RM1252 radio modules installed: 16.9 W

• AP1250 with one RM1252 radio module installed: 12.95 W

Note: For an AP1250 with two radios, 16.9 W is the maximum power required at the access point (powered device). When deployed using PoE, the power drawn from the power sourcing equipment will be higher by some amount dependent on the length of the interconnecting cable. This additional power may be as high as 1.6W, bringing the total system power draw (access point + cabling) to 18.5 W. A similar consideration applies for an AP1250 with one radio.

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6973/ps8382/product_data_sheet0900aecd806b7c5c.html

There are new Cisco switches capable of providing PoE for the 1250's;

3560E and 3750E

http://newsroom.cisco.com/dlls/2008/prod_012308.html

Hope this helps!

Rob

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Correct Answer
rob.huffman Mon, 06/23/2008 - 11:36

Hi Tau,

Hope all is well :)

Yes, the 1250 series (with dual radios) does require a "higher" PoE (18.5 W) than any other AP;

Q. What are the powering options for the Cisco Aironet 1250 Series? Is the Cisco Aironet 1250 Series 802.3af-compliant?

A. The Cisco Aironet 1250 Series Access Point may be powered by a Cisco Ethernet switch, a power injector, or a local power supply.

The Aironet 1250 Series Access Point with one RM1252 radio module installed requires 12.95W, which is within the 802.3af Power over Ethernet standard. Any Cisco switch supporting 802.3af may be used to power the Aironet 1250 Series Access Point with one RM1252 radio module installed.

Beginning late 2007, Cisco will enable auto-negotiating, single-port power for the Aironet 1250 Series access point on leading switches across the Catalyst portfolio. This unique, integrated solution provides the full power requirements for dual radio modules and eliminates the need to run an additional cabling drop or insert a separate power injector.

The Cisco Aironet 1250 Series Access Point may also be powered remotely using a Cisco Aironet Power Injector (AIR-PWRINJ4) or locally using a power supply (AIR-PWR-SPLY1).

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6973/ps8382/prod_qas0900aecd806b7c82.html

Powering Options

• Cisco Catalyst switch port capable of sourcing 18.5W or greater

• Cisco AP1250 Power Injector (AIR-PWRINJ4)

• Cisco AP1250 Local Power Supply (AIR-PWR-SPLY1)

• 802.3af switch (AP1250 with single radio only)

Power Draw

• AP1250 with two RM1252 radio modules installed: 16.9 W

• AP1250 with one RM1252 radio module installed: 12.95 W

Note: For an AP1250 with two radios, 16.9 W is the maximum power required at the access point (powered device). When deployed using PoE, the power drawn from the power sourcing equipment will be higher by some amount dependent on the length of the interconnecting cable. This additional power may be as high as 1.6W, bringing the total system power draw (access point + cabling) to 18.5 W. A similar consideration applies for an AP1250 with one radio.

http://www.cisco.com/en/US/prod/collateral/wireless/ps5678/ps6973/ps8382/product_data_sheet0900aecd806b7c5c.html

There are new Cisco switches capable of providing PoE for the 1250's;

3560E and 3750E

http://newsroom.cisco.com/dlls/2008/prod_012308.html

Hope this helps!

Rob

dennischolmes Mon, 06/23/2008 - 12:02

Make sure you calculate the total number of APs you can run per E series switch. IE 48 port E series 3750 can power 40 APs etc. Other devices such as PoE patch panels are a good option to insure power. Look for pre 802.3at panels.

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