The transmission of information, as words, sounds, or images, usually over great distances, in the form of electromagnetic signals, as by telegraph, telephone, radio, or television is called "Telecommunication". These days making connection between two units and transmitting information is an inevitable operation due to complicated computerized systems. Accepting this fact, the accuracy and quality of this transmission become important factors. These days different manufacturers produce telecom equipment and it is the EPC contractor responsibility to take of the equipment interfaces. HISTACO is an integrator of telecommunication systems which is approved by Iranian main clients such as P.O.G.C. The systems HISTACO supplies are CCTV, PABX, PAGA, NDB, EMS, RADIO (VHF, UHF, TETRA, MARINE) in one package as an EPC contract.