Search results
Results From The WOW.Com Content Network
The ringer equivalence number (REN) is a telecommunications measure that represents the electrical loading effect of a telephone ringer on a telephone line.In the United States, ringer equivalence was first defined by U.S. Code of Federal Regulations, Title 47, Part 68, based on the load that a standard Bell System model 500 telephone represented, and was later determined in accordance with ...
Irish, Malaysian and Singaporean phone sockets are normally wired, as per the international standard, with the line carried on the centre pair (pin 3 and 4). However, although rarely connected in practice, Irish phone jacks also contain a ringing capacitor circuit very similar to their UK counterparts. This is carried on pin 5.
A ring generator or ringing voltage generator is a device which outputs 20 cycle sinusoidal AC at up to 110 volts peak to power bells or annunciators in one or more telephone extensions. [4] The output stops if a handset is taken off the hook. In terminology devised by phone phreaks, a ringing generator is a magenta box.
In the United Kingdom, a warbling signal sounding rather like an alarm siren is played at steadily increasing volume to a telephone left off-hook and unused on telephone lines provided by the BT Group and many PABX extensions. It is sometimes referred to as a howler. In some cases it is composed of the DTMF tones * and # played alternately.
Some later ringing machines also generated a 50 Hz dial tone. The modern dial tone varies between countries. The Precise Tone Plan for the North American Numbering Plan of the US , Canada , and various Caribbean nations specifies a combination of two tones (350 Hz and 440 Hz) which, when mixed, creates a beat frequency of 90 Hz.
Two cordless telephones 3 VTech cordless landline phones A Panasonic KX-TG2226B 2.4GHz cordless phone with answering machine. A cordless telephone or portable telephone has a portable telephone handset that connects by radio to a base station connected to the public telephone network. The operational range is limited, usually to the same ...
The number of men who have developed breast cancer while working or living around Ground Zero has skyrocketed, The Post has learned. The federal Centers for Diseases Control reports that 91 men in ...
To its mobile telephone business customers BT Group provides a 1571 Voicemail service, which is similar to the service provided to landlines. Calling parties can leave messages when the mobile telephone is switched off, when it is in an area of reduced coverage, when it is on another call, or when the call is not answered within a fixed number of rings.