ST70134 - ST70135A

5/8

ADSL Modem control software

The

ADSL

transceiver

is

based

on

a

programmable DMT modem (ST70135A) whose

configuration is loaded by an external controller.

Additionally to the control functions, STMicro-

electronics provides the DMT modem software.

The software is written in C++ language, and is

designed to be portable to any processor.

The driver has to be interfaced with a real time OS

kernel, it is compatible with any standard product

available on the market. The kernel manages the

tasks dedicated to modem software.

The modem Software core comes with two

software modules: Board Support Package (BSP)

and Application Programming Interface (API).

BSP manages the hardware dependent features

(i.e. interrupts, peripheral mapping).

APIs interface to the higher level application

software and to the OS.

ADSL Loop performances

The hereafter tables show the performances that

a system, which houses ASCOT, can achieve for

ANSI and ETSI loops. The following results refer

to an end-to end ADSL equipment with no

external disturbance.

ANSI Loop (26awg)

ETSI Loop (Loop 2, noise model A)

Figure 4 : Software Architecture

USER HIGH LEVEL SOFTWARE

ADSL MANAGEMENT APPL ICATION SW

OS INTERFACE

MODEM SW

BOARD SUPPORT PACKAGE

ADSL HARDWARE

Length

Downstream

Upstream

9Kft

7.47 E +0.6

1.05 E +06

12Kft

3.69 E +0.6

9.37 E +05

15Kft

1.56 E +0.6

7.25 E +05

Length

Downstream

Upstream

2Km

8.00 E +0.6

8.32 E +05

4Km

4.07 E +0.6

6.72 E +05

5Km

1.70 E +0.6

4.72 E +05