
About Line Protocols
114078 Rev. A 2-19
Frame Formats
T1 uses two types of frame formats:
•D4
• Extended superframe (ESF)
D4
D4 is the original T1 frame format. A D4 frame (Figure 2-8) comprises
• One framing bit
•ADS0 timeslot for each channel on the line
A DS0 timeslot is an 8-bit sample from a channel.
A T1 line generates 8000 D4 frames/second.
Figure 2-8. D4 Frame
Timeslot 24Timeslot 2Timeslot 1
Framing Bit
LS0012A
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