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 ALIS Ring and Caller ID Signal Flow Graph

CID out

CIDL

CIDH

CIDBP

RLM

Tip/Ring

ADC

RIM

FIX

RIM

comparator for CID user-programmable block fixed filter block fixed functional block

DAC

Legend:

CIDL Caller ID Lowpass

CIDH Caller ID Hilbert Transformer

CIDBP Caller ID Bandpass

RLM Ring Level Metering

ADC Analog-to-Digital Converter

RIMFIX Ringer Impedace Filter Fixed Part

RIM Ringer Impedace Filter

DAC Digital-to-Analog Converter

Figure 11 Ring Signal Flow Graph

These data paths operate only when the ALIS is in Ringing state.

4.3.1 Caller ID (CID) Path

The Caller ID receiver meets Bellcore specifications TR-NWT-000030 and

SR-TSV-002476 for Caller ID. In this service, the calling party’s information (Calling Line

Identification Presentation (CLIP)) is transmitted in the silent interval between the first

and second ring. ALIS receives and stores up to 4096 bits of the 1200 baud FSK

(Frequency Shift Keying) signal. The decoding scheme meets the Bell 202 and ITU-T

V.23 specifications.

The FSK signal which contains the caller information is converted to a 1-bit data stream

by a comparator in order to minimize power consumption. Down-sampling steps are

performed in fast digital hardware filters. To decode the caller ID, bandpass filtering,

Hilbert transformation and other functions are implemented. The output CID-out is

sampled at 1200 baud, and stored in the CID-RAM.

Semiconductor Group

23

Data Sheet 06.98

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