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PABX

Private Automated Branch Exchange
 - Allows central control of incoming call via a single operator.

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Packet Switching

The method used to move data and voice around a network. In packet switching, all the data is broken up into chunks - each chunk has the address of where it came from and where it is going. This enables chunks of data from many different sources to co-mingle on the same lines and be sorted and directed along different routes by special machines along the way. In this way many people can use the same lines at the same time.

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PAN

Personal Area Network
 - Standards being developed by IEEE 802.15 based on radio (Bluetooth) technology.

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Parallel Port

Port in a PC used for the connection of external equipment such as a printer, scanner etc.

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Patch Port

Cabling connection point. This is typically the part of a structured network cabling system (cat 5) that enables switching of services either voice or data to RJ45 sockets.

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PBX

Private Branch Exchange - 
(Also called PBX, Private Business eXchange or PABX for Private Automatic Branch eXchange) - a telephone exchange that is owned by a private business, as opposed to one owned by a common carrier or by a telephone company.