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PSB4596V3.1

Analog Line Interface Solution ALIS V3

Siemens AG 

PSB 4595 / PSB 4596

Analog Line Interface Solution

Typical Applications

4

Typical Applications

As mentioned in the introduction, the ALIS V3 chip set is typically implemented in

modems and fax machines.

We present below four different types of modem where the ALIS V3 chip set is an ideal

solution:

- DSP-based modem (V.34, V.90)

- Host-based software modem (V.34, V90 on the host)

- Hybrid modem

- Modem with speaker path

In all the typical implementations, the innovative capacitor interface renders a

transformer redundant, cutting weight and space requirements in the modems.

4.1 The ALIS V3 Chip Set with Digital Signal Processor(DSP)-based Modem

The ALIS V3 chip set forms the front end between a DSP-based modem and the Tip/

Ring line.

DSP

µC

SDI

SCI (µCI)

PSB 4596

PSB 4595

Tip/Ring

Optional interface (See Section 7.3 below)

Legend:

SDI: Serial Data Interface

SCI: Serial Control Interface (= µCI: Microcontroller Interface)

Figure 4 DSP-based Modem Application

The DSP data pump is both source and destination of digital signals which are

transferred to and from the digital chip PSB 4596 via the Serial Data Interface (SDI) and

Serial Control Interface (SCI). The optional SCI enables external control of the ALIS V3

chip set (see also Section 7.3 below). The SCI gives transparent access to ALIS V3

commands and signaling pins so that precalculated coefficient sets can be downloaded

Semiconductor Group

14

Product Overview 06.98

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