Universal Serial Bus

IP Phones

USB IP Phones

Voice over Internet Protocol, or IP telephony, allows a computer user to make ordinary telephone calls over a computer network or Internet. VoIP converts the data signals from your telephone into digital signals and sends these signals in packets over the Internet. It then converts them back on the other end, allowing you to speak to virtually anyone with a telephone.

A new USB Internet phone may be purchased to use the internet as your long distance carrier. A USB phone is powered via the USB connection. An external RJ11 to USB adaptor may be purchased to connect a regular analog phone to a USB port on the computer. Another type of external RJ11 adaptor which connectors both to the analog phone and the wall outlet allows both VoIP calls and PSTN regular calls with same phone. Internal PCI computer cards may be purchased to allow normal phones to be used. The USB [Universal Serial Bus] specification defines the Mechanical, Electrical and Protocol layers of the interface. Cables and connectors are fully defined. USB defines 2 types of hardware, Hubs and Functions.



Aztech Systems Ltd.

Hawking Technology, Inc
{VoIP Internet Phones}

Motorola, Inc.
{External Analog phone to PC box}

{IP Telephones}

US Robotics
{USB Internet Phone, USB Internet Speaker-phone}

For additional back ground information on the USB bus refer to;
Universal Serial Bus page. or the page that covers Wireless USB.

USB Pinout

USB Type A Connector drawing and pin locations

USB Pinout, Cable Assembly
Pin Number Signal name Wire Description
D- White
D+ Green
Ground Black
Shell Cable Shield Drain wire

The USB pinout is the same for either a type A or B connector, the difference is in the shape
There is no rule that says an IP phone may not have another type connector in addition to a USB port;
Although other than power I have no idea what an additional connector would do.

USB Cable Assemblies and Adaptors

No cable assembly manufacturers are currently listed.
Of course the cable will be a USB cable, which is defined as having a length of 5 meters, or 16.4 feet.

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Modified 2/13/12
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