Trunk Interface
Field
E1
UK/Italy
T1
T1
Specifies the 8-bit PCM word that is transmitted to indicate silence in a voice channel. The word for T1 is 1111 1111 (FFh). The word for E1 is 0101 0101 (55h). The word for UK/italy is 0101 0100 (54h). This word is normally specified by the country telecommunications authority.