Cellular Definitions (P)


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PSTN

Public Switched Telephone Network

PSU

Power Supply Unit

PTO

Public Telecommunication Operator

PTT

Posts, Telephone and Telegraph Administration

PTT

Push-to-Talk; a feature of PMR systems

PWT

Personal Wireless Telecommunications; a variant of DECT developed for use in the USA

PCN

Personal Communications Networks; an outdated term for GSM services in the 1800MHz band

PDA

Personal Digital Assistant; a sophisticated handheld device with advanced display facilities and a range of business-oriented software programs

Phone book

A list of personal names and numbers stored in a mobile phone’s internal memory or in the SIM card. These numbers can be called by accessing the appropriate memory and making a single key stroke

PIN

Personal Identity Number; a number, usually four digits, that must be keyed into a mobile phone to make it work. A security measure to prevent unauthorised usage

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