T lines are designed for Digital data how they can be used for Analog Transmission?

T lines are designed for Digital data how they can be used for Analog Transmission?

• DS-1 requires 8 Kbps of overhead 
• To understand this overhead, let’s examine format of a 24-voice channel frame o Frame used on T-1 line is usually 193 bits divided into 24 slots of 8 bits each + 1 bit for synchronization (24*8+1=193) 
• 24 segments are interleaved in one frame 
• If a T-1 carries 8000 frames, the data rate is 1.544 Mbps (193 * 8000=1.544 Mbps) which is capacity of the line