User's Manual

USB audio support 567

ATA USB power limitations

• The Algo 4900 USB ATA can only accept power from a USB source

and is classified as a high power USB device (exceeds the 100mA limit

of the IP Phone USB port).

• For IP Phones 1120E/1140E/1150E, you must connect the Algo 4900

USB ATA to an externally powered USB hub, which is then connected

to the IP Phone USB port. If you connect the Algo 4900 USB ATA

directly to the IP Phone USB port, the IP Phone shuts down service

to the USB port

• For IP Phone 1165E, if the IP Phone is local AC powered, you can

connect the ATA directly to the phone. However, if the IP Phone

is POE powered, you must connect the Algo 4900 USB ATA to an

externally powered USB hub which is then connected to the IP Phone

USB port.

Nortel Communication Server 1000

IP Phones Fundamentals

NN43001-368 05.06 30 April 2010