PSB4595 Просмотр технического описания (PDF) - Siemens AG

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PSB4595

Analog Line Interface Solution ALIS

Siemens AG 

PSB 4595 / PSB 4596

Analog Line Interface Solution

ALIS Implementation

4.3.2 Ring-Level Metering (RLM) Path

The analog signal is converted to a 1-bit data stream in the ADC. After decimation in

hardware filters, the remaining processing is done in the digital filter structure (in RLM):

bandpass filtering to select the ringing frequency, and integration to determine if the

amount of energy in-band has exceeded the threshold for a valid ring signal. The

bandpass parameters and threshold are programmable.

Ringing is detected in this path. The digital input is bandpass filtered, integrated and

compared to a threshold to determine if a ringing signal has occurred. The threshold and

bandpass filters are programmable. The result of this operation can be monitored by

reading the RMR bit (see “CR1 Configuration Register 1 (Dialing)” on page 40).

4.3.3 Loops

A loop is available to generate the Ring-termination impedance (RIM).

4.3.3.1 Test Features

There are three loopbacks on ALIS-D to test interfaces:

- Host interface: loopback from the PCM interface (just inside ALIS-D)

- Caller ID interface: loopback from Caller ID input to capacitor interface

- Capacitor interface: loopback through different parts of the capacitor interface

There are two loopbacks on ALIS-A:

- Tip/ring interface: loopback from the tip/ring, before the ADC

- Codec: loopback from the tip/ring, after the codec

Semiconductor Group

24

Data Sheet 06.98

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