CHAPTER 1 GENERAL INFORMATION
– 30 – NWA-008853-001 Rev.3.0
97ch1001.fm
Frame Configuration of 24DTI
According to the AT&T Specifications for 24-channel transmission, there are two types of frame config-
urations: 12-Multi Frame (D4) and 24-Multi Frame (ESF).
(1) 12-Multi Frame (D4)
The frame has 12-Multi Frames, and each Multi frame has a 24-channel PCM signal (8 bits/channel)
and an S bit (Super Frame Bit). This figure shows the frame configuration, and table in next page
shows frame bit assignment.
Frame Configuration of 24DTI (12-Multi Frame)
S
CH1 CH2 CH3 CH24
123456781234567812345678 12345678
FRAME 1 FRAME 2 FRAME 3 FRAME 12
125 µs
S: SUPERFRAME BIT
DTI SPECIFICATIONS
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