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Chapter 2 Campus Infrastructure Considerations

Power to IP Phones

2-16

Cisco IP Telephony Network Design Guide

78-11103-03

Error and Status Messages

You can configure the system to send syslog messages that indicate any deviations

from the norm. These messages include the following deviations:

• Not enough power available

5SYS-3-PORT_NOPOWERAVAIL:Device on port 5/12 will remain unpowered

• Link did not come up after powering up the port

%SYS-3-PORT_DEVICENOLINK:Device on port 5/26 powered but no link

• Faulty port power

%SYS-6-PORT_INLINEPWRFLTY:Port 5/7 reporting inline power as

faulty

Power status can also be displayed on a per-port basis using the show port status

command. The command displays the following values:

• On—Power is being supplied by the port.

• Off—Power is not being supplied by the port.

• Power-deny—System does not have enough power, so the port does not

supply power.

Dual Supervisors

When the system is using dual supervisors, power management per port and

phone status are synchronized between the active and standby supervisor. This is

done on an ongoing basis and is triggered with any change to the power allocation

or phone status. The usefulness and functioning of the high availability features

are unaffected by the use of inline power.

Power Protection

Cisco recommends that backup power be used for a higher degree of redundancy

and availability. See the “Power Protection Strategies” section on page 2-4.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 50