telephone equipment

An old rotary telephoneA basic modern telephoneThis article is about telephone technology. For the game of telephone, see Telephone (game). For the band, see Téléphone.

The telephone or phone (Greek: tele = far away and phone = voice) is a telecommunications device which is used to transmit and receive sound (most commonly voice and speech) across distance. Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost any other.

Touch-tone telephone

Introduction

A touch-tone telephone keypad

An elementary telephone system would consist of three elements:

the equipment located at each subscriber which converts sound to electrical signals and back, and which allows the subscriber to answer or initiate a call,a central switching facility which interconnects all the subscriberswiring or other means to connect the subscriber to the central switching facility.

There are three principal ways a subscriber may be connected to the telephone network:

Historically, and still very commonly, by dedicated physical wire connections run in overhead or underground cables;By radio, as in a cordless, cellular, satellite or radiotelephone andBy voice over internet protocol (VoIP) telephones, which use broadband internet connections. Telephone equipment installation, Cleveland OH - Davissa. Home scuba equipment financing for industrial equipment heavy equipment trader gym equipment leasing refurbished cisco equipment restaurant equipment financing rack mount equipment home gym exercise equipment bar coding equipment powertec gym equipment tv exercise equipment av equipment rental equipment leasing uk commercial weight lifting equipment equipment ultrasound leasing equipment financing surplus electronic test equipment equipment test used equipment refurbished test sony dictation equipment equipment hewlett packard test horse equipment commercial kitchen equipment play equipment cheap fitness equipment used bakery equipment shot blasting equipment silk screen equipment used archery equipment .com auction equipment projection alberta course equipment heavy operator ambulance equipment antique drawn equipment farm horse asphalt spraying equipment auction cisco equipment auction equipment restaurant texas