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Modern emergency telephone powered by sound alone. A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [1] for both routine and emergency communication ...
A telephone switchboard is a device that allows telephone lines to be interconnected, enabling the routing of calls between different phones or phone networks. [ 17] The switchboard operator was a person who manually connected calls by plugging and unplugging cords on the switchboard.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
Nokia E50 Metal Black. The Nokia E50 Business Device is a bar-style monoblock quad-band mobile phone from Nokia announced 18 May 2006 [1] as part of the Eseries, intended primarily for the corporate business market. It includes sophisticated e-mail support for Nokia's Intellisync Wireless Email, BlackBerry Connect, Visto Mobile, Activesync Mail ...
SD-WAN. A software-defined wide area network ( SD-WAN) is a wide area network that uses software-defined networking technology, such as communicating over the Internet using overlay tunnels which are encrypted when destined for internal organization locations. [ 1]
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AT&T Merlin. AT&T Merlin is a corporate telephone system by American Telephone and Telegraph (AT&T) that was introduced in late 1983, when it was branded American Bell Merlin. After the breakup of AT&T in 1984, it was rebranded and later also supplied by Lucent and Avaya . The system was designed at the beginning of the 1980s prior to the Bell ...
Shine–Dalgarno sequence. The Shine–Dalgarno ( SD) sequence is a ribosomal binding site in bacterial and archaeal messenger RNA, generally located around 8 bases upstream of the start codon AUG. [ 1] The RNA sequence helps recruit the ribosome to the messenger RNA (mRNA) to initiate protein synthesis by aligning the ribosome with the start ...