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Chapter 2 Campus Infrastructure Considerations

Power to IP Phones

2-14

Cisco IP Telephony Network Design Guide

78-11103-03

Note The remainder of this chapter uses the Cisco CatOS command

syntax. For native Cisco IOS commands, refer to the specific

product documentation for the switches and line cards.

Configuring the Default Power Allocation

You can configure the default power allocation using the following command:

set inlinepower defaultallocation value

This command specifies how much power, in watts, to apply on a per-port basis.

The default value of 10W is good for any currently available or planned

Cisco IP Phone model. The phone has the intelligence to report to the switch how

much power it actually needs (using Cisco Discovery Protocol), and the switch

can adjust the delivered power accordingly, but under some circumstances you

might want to reconfigure the default allocation. For example, if the switch has

only 7W of available remaining power and you attach a new phone, the switch will

refuse power to the phone because it initially needs to send the default 10W (even

though the phone itself only requires 6.3W). In this case, you could reconfigure

the default power allocation to 7W, and the switch would provide power.

If the set inlinepower defaultallocation command executes successfully, the

system displays a message similar to

Default Inline Power allocation per port: 10.0 Watts (0.24 amps @42V)

If the set inlinepower defaultallocation command does not execute successfully,

the system displays the following error message:

Default port inline power should be in the range of 2000..12500 (mW)

Displaying the Inline Power Status

You can display the details on the actual power consumed by using the following

command:

show port inlinepower {mod | mod/port}

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 48