參數(shù)資料
型號(hào)： LE79R251JC
英文描述： Telecommunication IC
中文描述： 通信集成電路
文件頁(yè)數(shù)： 4/22頁(yè)
文件大?。?/td> 533K
代理商： LE79R251JC
P R E L I M I N A R Y
4
Le79R251 ISLIC Data Sheet
–
A low-level voltage proportional to the voice signal (VOUTi)
A voltage that controls longitudinal offset for test purposes (VLBi)
12 or 16 kHz metering signal
The ISLAC device performs the codec and filter functions associated with the four-wire section of the subscriber line circuitry in
a digital switch. These functions involve converting an analog voice signal into digital PCM samples and converting digital PCM
samples back into an analog signal. During conversion, digital filters are used to band-limit the voice signals.
The user-programmable filters set the receive and transmit gain, perform the transhybrid balancing function, permit adjustment
of the two-wire termination impedance and provide frequency attenuation adjustment (equalization) of the receive and transmit
paths. Adaptive transhybrid balancing is also included. All programmable digital filter coefficients can be calculated using
WinSLAC software and loaded into the ISLAC device registers using the system microprocessor. The PCM codes can be either
16-bit linear, twos-complement, or 8-bit companded A-law or μ-law.
Besides the codec functions, the Intelligent Access voice chipset provides all the sensing, feedback, and clocking necessary to
completely control ISLIC device functions with programmable parameters. System-level parameters under programmable control
include active loop current limits, feed resistance, and feed mode voltages.
The ISLAC device supplies complete mode control to the ISLIC device using the control bus (P1–P3) and tri-level load signal
(LDi).
The Intelligent Access voice chipset provides extensive loop supervision capability including off-hook, ring-trip and ground-key
detection. Detection thresholds for these functions are programmable and a programmable debounce timer is available that
eliminates false detection due to contact bounce.
For subscriber line diagnostics, AC and DC line conditions can be monitored using built-in test tools. Measured parameters can
be compared to programmed threshold levels to set a pass/fail bit and the user can choose to send the measurement data directly
to a higher level processor by way of the PCM voice channel. Both longitudinal and metallic resistance and capacitance can be
measured, which allows leakage resistance, line capacitance, and the number telephone ringers to be identified.
Note:
"i" denotes channel number.
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