Мушгиа хос (twisted pair): Засвар хоорондын ялгаа
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Мөр 65:
* [http://www.telcomhistory.org/vm/sciencePhonesWork.shtml Telecommunications Virtual Museum]
* [http://www.cisco.com/web/learning/netacad/demos/FWLDemo/ch1/1_2_5/index.html/ cisco]
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