other T-carrier links, and E1 and other E-carrier links SONET/SDH OpticalTransportNetwork(OTN) GSM Um air interface物理层 Bluetooth物理层 ITU Recommendations:
sent). Data communication over the telephone network. [2008-02-06]. (原始内容存档于2014-01-27). Morse can transport 26 alphabetic, 10 numeric and one interword