MT8924AS View Datasheet(PDF) - Mitel Networks
Part Name
Description
MFG CO.
MT8924AS Datasheet PDF : 14 Pages
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MT8924
Preliminary Information
Noise
Threshold
PCM Byte
+ve input
-ve input
A-Law
µ-Law
1/4096
9/4096
16/4096
32/4096
1/8159
9/8159
16/8159
32/8159
B7 - B0
1000 0000
1000 0100
1000 1000
1000 1111
1111 1111
1111 1011
1111 0111
1111 0000
B7 - B0
0000 0000
0000 0100
0000 1000
0000 1111
0111 1111
0111 1011
0111 0111
0111 0000
Table 1 - PCM Noise Suppression Threshold Levels
Overflow Detection / Input Channel Attenuation
If the sum of the channels involved in one
conference exceeds the full scale value of the
accumulator, an overflow condition is generated
which can be monitored specifically by reading the
status of the overflow register. If an overflow
condition occurs, then each channel in a conference
can be independently attenuated if desired.
Alternatively, a conference in the overflow condition
can be detected using the OS signal in conjunction
with frame pulse F0i. OS will be low during the
second half of a general output channel slot time N,
if channel N belongs to a conference in overflow (see
Figure 11). This information can be used to control
input channel attenuation through software control.
F1 F0
B7 B6 B5 B4 B3 B2 B1
0
0 + Full Scale
1
1
1
1
1
1
1
+ 0 Level
1
0
0
0
0
0
0
- 0 Level
0
0
0
0
0
0
0
- Full Scale
0
1
1
1
1
1
1
0
1 + Full Scale
1
0
1
0
1
0
1
+ 0 Level
1
1
0
1
0
1
0
- 0 Level
0
1
0
1
0
1
0
- Full Scale
0
0
1
0
1
0
1
1
0 + Full Scale
1
1
0
1
0
1
0
+ 0 Level
1
0
1
0
1
0
1
- 0 Level
0
0
1
0
1
0
1
- Full Scale
0
1
0
1
0
1
0
1
1 + Full Scale
1
0
0
0
0
0
0
+ 0 Level
1
1
1
1
1
1
1
- 0 Level
0
1
1
1
1
1
1
- Full Scale
0
0
0
0
0
0
0
Table 2 - PCM Byte Format
B7 (sign bit) is the MSB and B0 is the LSB
F1-F0 corresponds to the D5-D4 bits of the control byte of Operating Mode Instruction 5
B0
Comments
1 No Inversion
0
0
1
0 Even Bit Inversion
1
1
0
1 Odd Bit Inversion
0
0
1
0 Bit Inversion
1
1
0
8-6
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