MT89L80AP1 Просмотр технического описания (PDF) - Zarlink Semiconductor Inc
Номер в каталоге
Компоненты Описание
производитель
MT89L80AP1 Datasheet PDF : 17 Pages
| |||
MT89L80
Data Sheet
of the line circuit by building signalling logic, e.g., for on-off hook detection, which communicates on an ST-BUS
output. This signalling ST-BUS output is monitored by a microprocessor (not shown) through an ST-BUS input on
the bottom MT89L80.
Fig. 8 shows how a simple digital switching system may be designed using the ST-BUS architecture. This is a
private telephone network with 256 extensions which uses a single MT89L80 as a speech switch and a second
MT89L80 for communication with the line interface circuits.
89L80 used
as
speech
switch
STo0
STi0
MT89L80
89L80 used
in message
mode for
control and
signalling
STo0
STi0
MT89L80
DX
DR
MT8964
Filter/Codec
DC
Signalling
Logic
Line Driver
and
2- to 4-
Wire
Converter
Line Interface Circuit with 8964 Filter/Codec
Figure 7 - Example of Typical Interface between 89L80s and 8964s for Simple Digital Switching
System
Controlling
Micro-
Processor
Speech
Switch
-
89L80
Control &
Signalling
-
89L80
8
STi0-7
8
STo0-7
STo0-7
8
STi0-7
8
Line Interface Circuit
with Codec (e.g. 8964)
Line 1
•
•
•
Repeated for Lines
2 to 255
•
•
•
Repeated for Lines
2 to 255
Line Interface Circuit
with Codec (e.g.8964)
Line 256
Figure 8 - Example Architecture of a Simple Digital Switching System
8
Zarlink Semiconductor Inc.
Share Link: 