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.
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 Speaker-phone}
For additional back ground information on the USB bus refer to;
Universal Serial Bus page. or the page that covers Wireless USB.
Pin Number | Signal name | Wire Description |
VBUS | Red | |
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.
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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