3905 SIP phone has issue with 3550 switch, what is the resolution?

[Siva Prasad Kakani]

We are having issue with 3905 SIP. When we connect it to 3550 switch, it is not getting up. Can somebody help me on this?

Regards,

Siva Prasad

[Leonardo Santana]

This is an POE switch? Other IP Phones have this issue?

What is part number?

Regards

Leonardo Santana

[Siva Prasad Kakani]

Yes, it is a POE swith. We don't have issue with 7905, 7911 and 7940 IP phones.

Part Number is: 341-0029-03

[jbillingsley]

3550's use pre-standard inline power. You may need a dongle so the phone is able to power up off that switch. I'm not sure about the 3905 phones, but I know this was an issue with the 7900's series phones.

[Leonardo Santana]

Sorry please pass the model number!

[ariksebbag]

Cisco phone 3905,7965,7970,69xx doesn't work with switch 3550 you need 3560 or 2960 switch or power supply

Don't try with 3550 it doesn't work you miss your time

Best regard

Erick

Sent from Cisco Technical Support iPad App

[Leonardo Santana]

Hello like Erick said (plus five) the 3905 uses 802.3af and the 3550 does not support this standard:

Q. Does the Cisco Catalyst 3550-24 PWR Switch support the 802.3af inline power standard?

A. No, this switch supports Cisco Pre-Standard Power over Ethernet. The  Catalyst 3750 Series and Catalyst 3560 Series support the Cisco  Pre-Standard Power over Ethernet and IEEE 802.3af Power over Ethernet.

Reference:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps646/prod_qas09186a00800913d3.html

Take a look on the PoE Faq:

http://www.cisco.com/en/US/products/hw/phones/ps379/products_qanda_item09186a00808996f3.shtml#qa2

Regards

Leonardo Santana

[Siva Prasad Kakani]

Thank you Leonardo and erick. Further, I found the support doucument in the below discussion :

POE issue on cat 3550

http://www.cisco.com/warp/public/cc/pd/si/casi/ca6000/prodlit/psnap_br.pdf

Regards,

Siva Prasad