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This is ISDN: Make common of live abroad of live abroad of thorium of fraud of H
ISDN (Integrated Service Digital Network) Chinese name is net of integrated business figure, common is called " a gleam of is connected " . At present telephone network is exchanged and relay basically had realized digitlization,...
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IP phone: Be in power not Rao Ren
IP phone looks It is one kind uses computer to unplug through the network call to another computer (PC) or phone (the application software of Phone) , partial software still can use deferent video, speech and file to wait a mom...
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The individual character characteristic of ISDN, terminal unit and derive
Net of integrated business figure is to be able to offer the client side to join to client side number, can assume phone and the telegraphic net of a variety of business that be not a word at the same time. Net of integrated busin...
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What is meant by telephone communication network
Telephone communication network is to undertake alternant model one's voice in speech corresponds, open the telegraphic network of telephone business, abbreviation telephone network. It is a kind of telegraphic portfolio the bigge...
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The principle of phone
Telephone communication is to pass sound energy and electric energy mutual changeover, use " report " the technology of a kind of communication that this agency will come to transmit a language. Two users should have communication...
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The number exchanges an a bit
Time slot exchange The number is joined to exchange a net in PCM transmission system, be equivalent to will time answer uses a line (PCM line) cent becomes input and output side, if plan institute is shown. Road is medium inpu...
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Time multichannel communication introduces
PCM transmits a system Signal of imitate of one's voice in speech is in send upright course to sample, quantify and PCM got after encode (pulse encode modulation) signal, this signal sends pair of end through transmission line...
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Satellite communications sentence is short long
Satellite communications is the same as commonly used now cable communication, microwave communication to wait for photograph comparing, have more advantage, can generalize basically for a few words; Far: It is to show the distanc...
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