DIRECT DIGITAL INTERFACE (DDI)
DTI SPECIFICATIONS
– 204 –
A2195-10
24-Multi Frame Bit Assignment
* The S-bit is the first bit in each frame.
* Frames are repeated in the order shown above.
* Frames 6, 12, 18 and 24 become signal frames.
* “m” in the “4 Kbps Data Link” column means that the frame is usually assigned to 1.
FRAME
No.
S BIT
BIT No. OF EACH CHANNEL
(CH1-CH24)
SIGNAL
CHANNEL
FRAME
SYNCHRONIZATION
4 Kbps
DATA LINK
CRC
INFORMATION
SIGNAL BIT
CONTROL
SIGNAL BIT
1 m 1-8
2 CB1 1-8
3 m 1-8
4 0 1-8
5 m 1-8
6 CB2 1-7 8 A
7 m 1-8
8 0 1-8
9 m 1-8
10 CB3 1-8
11 m 1-8
12 1 1-7 8 B
13 m 1-8
14 CB4 1-8
15 m 1-8
16 0 1-8
17 m 1-8
18 CB5 1-7 8 C
19 m 1-8
20 1 1-8
21 m 1-8
22 CB6 1-8
23 m 1-8
24 1 1-7 8 D
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