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參數(shù)資料
| 型號： | AG2130 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | LOW COST PSTN INTERFACE |
| 中文描述： | 低成本PSTN接口 |
| 文件頁數(shù)： | 5/11頁 |
| 文件大?。?/td> | 198K |
| 代理商： | AG2130 |
V1.4 September 2006
Data Sheet
Ag2130
LOW COST PSTN INTERFACE
eg.
2-wire
Impedance
Z
T
Z
C
Network
Balance
Impedance
Z
b1
Z
b2
Z
b3
C3
Notes
1
600
300
47K
600
100K
0R
---
---
USA Short Line,
Far East, Middle East
2
CTR21
750R//
220nF
68K//
680pF
CTR21
220K//
680pF
5.1K
---
---
Europe
3
900
620
62K
900
220K
0R
---
---
USA Long Line, Brazil
4
600
300
47K
100R
+1K//100nF
39K
39K
0R
1.5nF
Japan
Table 2: Line and Network Balance Impedance Examples
3.2 The 2 Wire Impedance
The input impedance, Z
IN
, of the Ag2130 can be
programmed. This is achieved by connecting an
impedance matching network between Z
T1
and Z
T2
.
This network is the line impedance to be matched
minus 300
. For example to match 600
, fit a 300
resistor. Other common line impedances, and the
corresponding programming components are listed in
Table 2.
In addition to the programming network, an impedance,
Z
C
must be fitted between ZT2 and Zb to provide gain
and frequency compensation.
An alternative method of programming the 2 wire
impedance is to choose a codec where the internal
filter characteristics can be programmed to provide the
correct matching. In order to generate the filter
coefficients a model of the Ag2130 must be used. This
file, in .CIR format is available on request from Silver
Telecom or one of our representatives.
Full details on how the Codec is programmed must be
obtained from the Codec manufacturer.
3.3
Network Balance Impedance
The setting of the network balance impedance is very
similar to that of the 2 wire impedance. Again this can
be done by programming of the codec, using the .CIR
file, or it can be done by hardware components.
3.4
On-Hook Reception
The need for data exchange when on-hook is
becoming increasingly common. This may be required
for Caller Line I.D. or for telemetry purposes. The
V
CC
R1
Z
B1
C1
C2
Ag2130
V
IN
V
OUT
DMa
V
CC
Z
b
DMb
GND
GND
T E L E C O M
C3
Z
B2
GND
Z
B3
Z
T
Z
C
Z
T1
Z
T2
Silver
For 600
application:
R1 = 390K
ZB1 = 100K
ZB2 = 0R
ZB3 = NF
ZT = 300R
ZC = 47k
C1, C2 = 100nF
C3 = NF
Figure 3: Line Impedance and Network Balance Components
Silver Telecom 2006
5
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