MT8981D 데이터 시트보기 (PDF) - Zarlink Semiconductor Inc
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MT8981D Datasheet PDF : 20 Pages
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MT8981D
Data Sheet
Fig. 8 shows how a simple digital switching system may be designed using the ST-BUS architecture. This is a
private telephone network with 128 extensions which uses a single MT8981 as a speech switch and a second
MT8981 for communication with the line interface circuits.
A larger digital switching system may be designed by cascading a number of MT8981s. Fig. 9 shows how four
MT8981s may be arranged in a non-blocking configuration which can switch any channel on any of the ST-BUS
inputs to any channel on the ST-BUS outputs.
Controlling
Micro-
Processor
Speech
Switch
-
8981
Control &
Signalling
-
8981
4
STi0-3
4
STo0-3
STo0-3
4
STi0-3
4
Line Interface Circuit
with Codec (e.g. 8964)
•
•
•
Repeated for Lines
2 to 127
Line 1
•
•
•
Repeated for Lines
2 to 127
Line Interface Circuit
with Codec (e.g. 8964)
Line 128
Figure 8 - Example Architecture of a Simple Digital Switching System
IN 0/3
8981
#1
STi0/3 STo0/3
OUT 0/3
8981
#2
STi0/3 STo0/3
OUT 4/7
IN 4/7
8981
#3
STi0/3 STo0/3
8981
#4
STi0/3 STo0/3
Figure 9 - Four 8981s Arranged in a Non-Blocking 8 x 8 Configuration
9
Zarlink Semiconductor Inc.
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