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參數資料
| 型號： | AM79231 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Intelligent Subscriber Line Interface Circuit (ISLIC) |
| 中文描述： | 智能用戶線接口電路（ISLIC） |
| 文件頁數： | 9/28頁 |
| 文件大小： | 278K |
| 代理商： | AM79231 |
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Am79231 Data Sheet
9
GENERAL DESCRIPTION
The Intelligent Access voice chipsets integrate all functions of the subscriber line. Two chip types
are used to implement the linecard; an Am79231 device and an ISLAC device. These provide the
following basic functions:
1. The Am79231: A high voltage, bipolar device that drives the subscriber line, maintains
longitudinal balance and senses line conditions.
2. The ISLAC device: A low voltage CMOS IC that provides conversion, control and DSP functions
for the Am79231.
Complete schematics of a linecard using the Intelligent Access voice chipsets for external ringing
is shown in Figure 3.
The Am79231 uses reliable, bipolar technology to provide the power necessary to drive a wide
variety of subscriber lines. It can be programmed by the ISLAC device to operate in eight different
modes that control power consumption and signaling. This enables it to have full control over the
subscriber loop. The Am79231 is designed to be used exclusively with the ISLAC devices. The
Am79231 requires only +5 V power and the battery supplies for its operation.
The Am79231 implements a linear loop-current feeding method with the enhancement of intelligent
Thermal Management. This limits the amount of power dissipated on the Am79231 chip by dissi-
pating power in external resistors in a controlled manner.
Each ISLAC device contains high-performance circuits that provide A/D and D/A conversion for the
voice (codec), DC-feed and supervision signals. The ISLAC device contains a DSP core that handles
signaling, DC-feed, supervision and line diagnostics for all channels.
The DSP core selectively interfaces with three types of backplanes:
Standard PCM/MPI
Standard GCI
Modified GCI with a single analog line per GCI channel
The Intelligent Access voice chipset provides a complete software configurable solution to the BOR-
SCHT functions as well as complete programmable control over subscriber line DC-feed character-
istics, such as current limit and feed resistance. In addition, these chipsets provide system level
solutions for the loop supervisory functions and metering. In total, they provide a programmable
solution that can satisfy worldwide linecard requirements by software configuration.
Software programmed filter coefficients, DC-feed data and supervision data are easily calculated
with the WinSLAC
software. This PC software is provided free of charge. It allows the designer to
enter a description of system requirements. WinSLAC then computes the necessary coefficients
and plots the predicted system results.
The Am79231 interface unit inside the ISLAC device processes information regarding the line volt-
ages, loop currents and battery voltage levels. These inputs allow the ISLAC device to place several
key Am79231 performance parameters under software control.
The main functions that can be observed and/or controlled through the ISLAC backplane interface
are:
DC-feed characteristics
Ground-key detection
Off-hook detection
Metering signal
Longitudinal operating point
Subscriber line voltage and currents
Ring-trip detection
Abrupt and smooth battery reversal
Subscriber line matching
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