Polycom CX300 Manuale Utente

Deployment Guide for the Polycom CX300 Desktop Phone

 6

Check the following:

• The computer displays the message USB Hub Power Exceeded when the 

phone is plugged in.
Connect the phone to a different USB port on the computer. Or, connect 

the phone to a USB hub that is connected to the computer, and powered 

by an external power supply. USB hubs without external power supplies 

are not supported by this phone.

• The phone display is blank.

— The phone might not be receiving power. Verify that the USB hub that 

the phone is connected to is receiving power from an external power 

supply. The USB hub must be turned ON and connected to the 

computer that is running Microsoft Office Communicator 2007 R2. 

Also check that the other devices connected to the USB hub are 

working.

— The phone might have been disconnected and then reconnected too 

quickly. Disconnect the phone’s USB plug from the USB port, wait 10 

seconds, and then reconnect it. 

— The computer to which the phone is connected might have high CPU 

utilization, which could slow down the communication with the 

phone. Exit any open resource-intensive programs that are currently 

not required.

• The computer is in sleep mode.

You cannot use the phone when the computer is in sleep mode.

If the phone still does not recognize the computer it is connected to after you 

complete the preceding checklist, try to connect the phone to other USB ports 

on the computer or the USB hubs. Also, try to connect the phone to another 

computer that you know is working correctly with Microsoft Office 

Communicator 2007 R2.