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參數資料
| 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： | 4/11頁 |
| 文件大小： | 198K |
| 代理商： | AG2130 |
V1.4 September 2006
Data Sheet
Ag2130
LOW COST PSTN INTERFACE
2.0
Line Interfacing
The Ag2130 line interface provides a flexible and
robust interface to the telephone line. It has been
designed to meet regulatory standards whilst providing
a space and power efficient solution.
2.1
D.C. Termination.
Any equipment terminating a telephone line must
present the correct d.c. resistance to the line. This
ensures that the correct loop current flows for detection
of the off-hook condition. It avoids excessive power
dissipation in the Subscriber Line Interface (SLIC) and
the Subscriber’s equipment and minimises the size of
power supply needed to drive the SLIC.
The Ag2130 has been designed to meet the
requirements of many network operators. This is done
by making the d.c. characteristic adjustable. This is
controlled by connecting the DM pins on the line side of
the circuit. Table 1 shows how these are connected.
Table 1 Set Up of the DM Pins
Market
DMa
DMb
North America
(EIA 464, Resistive)
Connect together through
390K resistor
Europe (CTR21)
Connect together through
390K resistor
Far East
Connect together through
390K resistor
2.2
Signalling and Loop Status.
The Ag2130 provides facilities to monitor and control
the telephone line. This allows the device to be used
with a variety of loop signalling schemes and minimises
the number of external components needed to
implement a complete line interface.
In order to implement ground start applications please
contact Silver Telecom or our local representative.
2.2.1 The On-Board Loop Switch
The Ag2130 implements the loop start protocol when
initiating and answering a call. This means that a
switch must be closed to allow loop current to flow,
signalling to the SLIC that the terminating equipment
has gone “off-hook”. This has been done historically
by a relay. The Ag2130 uses an integral optically
isolated switch to do this, eliminating the need for an
external relay, so space and cost is saved for the user.
The on-board Loop Switch is controlled by the LSC pin.
A logic 1 applied to the pin closes the loop switch. This
is done when the terminating equipment wishes to
begin a call or in response to the reception of the
ringing signal. The LSC pin can be controlled by the
output drive pins of a codec or from a micro controller
device.
2.2.2 Ringing Detection and Sensitivity.
The terminal equipment must be capable of detecting
and responding to an incoming call in the same way as
a telephone set. The termination circuitry must,
therefore, detect the presence of the ringing signal.
The Ag2130 provides an output, RS, which indicates
the presence of ringing by switching from a logic 1 to
logic 0. The RS output will toggle at the ringing
frequency. A capacitor to ground can also be added if
ringing cadence is needed rather than the ringing
frequency.
The sensitivity to ringing is set internally to 22V
RMS
when V
CC
is +5V.
3.0 The 2-4 Wire (Hybrid) Conversion.
The Ag2130 transmits and receives balanced 2-wire
analog signals at the Tip and Ring connections. These
are converted to a ground referenced output at V
OUT
and from a ground referenced signal at V
IN
.
V
OUT
and V
IN
are normally connected to a codec (via
d.c. blocking capacitors) for conversion to and from a
Pulse Code Modulated (PCM) stream.
3.1 Transmit and Receive Gain.
The off-hook gain in both the transmit and receive
directions is set at typically 0dB. Any gain adjustments
can be made using the codec functionality. This is
either by hardware or software depending upon the
codec used.
Silver Telecom 2006
4
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