Esi sixhobo sibonelela nge-1-4 * E1 ujongano , I-Standard 2 yefowuni yomnxeba njenge-engineering order-wire (ukhetho).Ibhetyebhetye kakhulu.Inomsebenzi we-alam.Umsebenzi unokwethenjelwa, uzinzile, kunye nokusetyenziswa kwamandla aphantsi, ukudibanisa okuphezulu, ubungakanani obuncinci.