Profile: Centratech, Inc specializes in voice and data communication systems. Our product line includes paging & sound systems, voice & data cabling, tele communication systems and data network solutions. Our TMC EPIC 4-Line Intercom Speakerphones are an expandable plug and play phone system. There are two Epic phone models available. The ET4300, and the EV4500 which adds built-in voicemail and auto attendant. Both models are fully compatible. Our commonly known as Cat 5, is an unshielded twisted pair cable type designed for high signal integrity. With the 2001 introduction of the TIA/EIA-568-B standard, the category 5 cabling specification was made obsolete and superseded by the category 5e specification.