IP Phones

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

3Com Corp.
{IP Phones}

ADTRAN, Inc.

Aztech Systems Ltd.

Hawking Technology, Inc
{VoIP Internet Phones}

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

Toshiba
{IP Telephones }

US Robotics
{USB Internet Phone, USB Internet Speakerphone}

ZOOM Telephonics Inc.
{Analog Telephone Adapters}

USB Pinout

The USB pinout is the same for either a type A or B connector, the difference is in the shape

USB Cable Assemblies and Adaptors

The USB Cable is 4 wire. The data wires are 28 AWG, the power wires are 20 to 28 AWG. Two power lines are un-twisted and 2 data lines, twisted. Longer cables will use 20 AWG for power. The wire are color coded per the drawing above. Cables will have an A plug on one end an a B plug on the opposite end. The maximum cable length is 5 meters; however that can be increased by using Hubs. The USB interface is designed to operate down to -20 degrees C.

APC

RAM Electronics Industries Inc
{USB Converters / Adaptors / Cable Assemblies}

icron
{Extreme USB - USB Converter, Hub/Hub allows USB up to 100 meters}

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