I know currently on the 3750 with POE that each switchport gives out 15.4W of power automatically be default. I am trying to find out if there is a way to decrease this value to a lower W for class 0 or class 3 devices. Does anyone have any information on this, or if it could be done. I have not seen anything in the Cisco technical documents.
The maximum power a port in a 24 port inline powered 3750 is 15.4W and it is not a fixed value. Are you having any issues with powering certain devices? If so, please open a TAC service request and have it addressed.
We are going to be connecting the following platforms of IP Phones to the 3750, that have the following wattage requirements.
Avaya 4610 average watts is 4, worst case 6
Avaya 4620 average watts is 6, worst case 8 (Class 3)
Avaya 4612 average watts is 5, worst case 6.5
Avaya 4624 average watts is 5, worst cast 6.5
As you can see, we do not need to provide 15.4W per device, due to the fact that it does not need that amount. We are just needing to know how to adjust the POE requirments at the port level. If you have any suggestions, please let me know. Thanks for your help.
As long as the Avaya phones you mention meet the IEEE 802.3af Power over Ethernet standard, they should work fine automatically with the Cisco switch. As you mentioned in an earlier post, inline power is automatically supplied on the 3750 ports. The IOS command "power inline" is set to "auto" by default according to:
Although each port can supply up to 15.4W, each phone will only draw as much power as it needs individually. The concept is similar to a battery in a flashlight--if the switch isn't turned on, the electrical circuit remains "open" and no current flows. In other words, no power is transferred from the battery to the lightbulb. But even if you have huge batteries, the lightbulb is only going to draw as much current as it needs to stay lit.
I would suggest testing one phone of each type with the switch before a full production install, just to be sure you won't have interoperability problems.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.