Interface-ka G.703 (Co-Directional G.703) wuxuu u qaybiyaa wareegga 64Kbps ee 4 qaybood, wuxuu isticmaalaa"0101" wuxuu u taagan yahay "0", "1100" waxay u taagan tahay "1" .Marka la beddelo isbeddelka isbeddelka ee xannibaadda ku xigta, calaamadaha binary waxay beddelaan calaamadaha saddex-heer ah.