Cisco 7912 IP Phone PoE woes

Hi Scott,

Cisco IP Phones NOT compliant with IEEE 802.3af:

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Cisco and Linksys One IP Phones THAT ARE compliant with IEEE 802.3af:

Cisco IP Phones:

Linksys One IP Phones:

PHM1200

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Hope this helps.

Brad Reese BradReese.Com - Cisco Power Supply Headquarters

Brad,

Thanks for your reply, I have seen your posting below in other searches.

According to the Regulatory Compliance document that comes with the 7912G phone, it quite clearly states:

Warning: "This product must be connected to a power-over-ethernet (PoE) IEEE

So, unless they are lying then it should work....

Regards,

Scott

Scott,

It appears to be a Cisco Power Detection issue.

voip-info.org - How to use Standard 802.3af POE Injectors w/ Cisco

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The IEEE 802.3af-2003 Power over Ethernet ( PoE ) standard defines terminology to describe a port that acts as a power source ( PSE ) to a powered device ( PD ).

This standard defines how a powered device is detected as well as two methods of delivering PoE to the discovered powered device.

IEEE 802.3af power can be delivered through a PoE capable Ethernet port ( referred to as an end-point PSE ).

In the event that an existing non-PoE capable Ethernet switch is used, a mid-span PSE can be used.

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Cisco IP phones

Can accept Cisco pre-standard PoE from a card integrated with a Cisco Catalyst switch or a Catalyst in-line power patch panel.

These phones can draw local power from a power cube ( CP-PWR-CUBE-2= ) in addition to a country or regionally specific power cord ( CP-PWR-CORD-xx= ).

Only Cisco IP phones

Support IEEE 802.3af PoE.

The Cisco IP phone

Supports both the Cisco pre-standard PoE and IEEE 802.3af PoE.

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Cisco Unified IP Phone 7912G Data Sheet:

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Scott, you may wish to investigate PowerDsine:

Brad Reese Global Cisco Systems Pre-Sales Support