Intel IXP400 manual Device Support, Adsl Driver Overview

	Intel® IXP400 Software
ADSL Driver	25

This chapter describes the ADSL driver for the Intel® IXDP425 / IXCDP1100 Development Platform and Intel® IXDP465 Development Platform that supports the STMicroelectronics* (formally Alcatel*) MTK-20150 ADSL chipset in the ADSL Termination Unit-Remote (ATU-R) mode of operation.

The ADSL driver is provided as a separate package along with the Intel® IXP400 Software v2.0.

25.1What’s New

There are no changes or enhancements to this component in software release 2.0.

25.2Device Support

STMicroelectronics MTK-20150 on the IXDP425 / IXCDP1100 platform. The MTK-20150 chipset is made up of MTC-20154 integrated analog front end and the MTC-20156 DMT/ATM digital modem and ADSL transceiver controller.

25.3ADSL Driver Overview

The two main interfaces to the ADSL chipset are:

•The parallel CTRL-E interface — via the processor’s expansion bus

•The ATM UTOPIA data path interface — via the processor’s UTOPIA interface

The ADSL driver only supports communication with the ADSL chipset via the CTRL-E interface. All data path communication (ATM UTOPIA) must be performed via the ATM Access Layer component of the IXP400 software.

The driver uses the CTRL-E interface to download the STMicroelectronics firmware, configure and monitor the status of the ADSL chipset. The advantage of downloading the firmware via the CTRL-E interface is that it removes the requirement for a separate flash for the STMicroelectronics ADSL chipset.

The driver provides an API to bring the ADSL line up in ATU-R mode. The line is configured to negotiate the best possible line rate, given the conditions of the local loop when the line is opened. The line rate is not renegotiated once the modems are in the “show-time” mode.

There is very little configuration information required to open an ATU-R line. Almost all line configuration parameters are supplied by the ATU-C side.

APIs are provided to take the modem off line and to check the state of the line to see if the modem is in “show-time” mode.

Programmer’s Guide	IXP400 Software Version 2.0	April 2005
	Document Number: 252539, Revision: 007	327