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參數資料
| 型號： | AG1460PD |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | QUAD 5V RINGING SLIC |
| 中文描述： | 四5V的振鈴用戶接口 |
| 文件頁數： | 6/15頁 |
| 文件大小： | 264K |
| 代理商： | AG1460PD |
V1.4 May 2004
Data Sheet
Ag1460
QUAD 5V RINGING SLIC
1.0 Line Interfacing
As well as being in an electrically demanding
environment, the needs of different applications and
regulatory standards means that the SLIC must allow
flexibility, together with facilities to ensure robust
performance. All four of the SLICs on the Ag1460
provide a complete and flexible interface to the
telephone line.
1.1 Battery Feed
The Ag1460 has an integral DC-DC converter which
generates the battery voltages in the device. This
means that only a supply of +5V, and GND is needed,
unlike conventional SLICs which will need a battery
voltage of anything between -20V and -60V (-75V for
ringing). This confers a significant cost, space and
time to market benefit on the equipment designer.
The battery feed to the telephone line is generated
from the positive supply rail. This provides a -48V
battery feed to the line, except during ringing, when this
is increased to -72V. The loop current is pre-set to a
constant 24mA. If the loop length is such that the
constant current feed cannot be maintained (i.e. >3km),
then the Ag1460 will revert to a constant voltage
source, allowing the loop to be serviced at a reduced
loop current.
1.2 Ringing
The ringing signal is generated by switching the
appropriate SLIC into ringing mode by setting the RM
pin high and then toggling the F/R pin at the required
frequency and cadence. The toggling of the F/R pin
produces a balanced signal at Tip and Ring. These
signal waveforms are shown in figure 3.
During ringing the DC-DC converter automatically
Silver Telecom 2004
OUTPUT SHK
1
0
Off hook detected
Off Hook
NOTE: SHK SHOULD
BE DE-BOUNCED
Condition 2 - Ringing On-hook
RM
1
0
F/R
(input)
1
0
SHK
1
0
Condition 3 - Ringing/Off-hook
A
B
The phone goes off hook, and SHK is detected at point A
(leading edge). RM must be switched low in <500ms
(point B), and the ringing cadence should be removed
from F/R..
As long as the telephone is off hook, SHK will remain high.
1 sec
3 sec
1 sec
3 sec
Figure 3: Ringing Signal Waveforms
Condition 1 - DC operation
Signal
Notes
INPUT RM
1
0
No ringing
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