Trunk interface linecard design - Embedded.com

Trunk interface linecard design

Communication integrated circuit suppliers Legerity and Clare, have developed a foreign exchange office (FXO) evaluation platform that will reduce the system-level cost, board space and development time for trunk interface linecards used in enterprise, public network and customer premises equipment (CPE) applications.

The Legerity-Clare FXO evaluation platform can be programmed through software to handle complex impedance synthesis for virtually all world telecommunications markets.

Jointly developed by Legerity and Clare, the FXO evaluation platform provides an integrated set of hardware and software tools that greatly simplifies the development of FXO linecards used in central office (CO), digital loop carrier (DLC), computer telephony, private branch exchange (PBX), IP-based PBX, router and telephony gateway equipment. With the evolution toward broadband networks, system designers increasingly rely on development tools to speed their trunk interface linecard applications to market. The FXO evaluation platform enables communication system designers to perform useful FXO functions immediately, including demonstration of a mini-PBX system.

The FXO evaluation board consists of Legerity's next-generation, four-channel QLSLAC codec/filter device on a motherboard with four sockets to accommodate phone line interface (PLI) daughtercards from Clare. Legerity's DSP-based QLSLAC device provides programmable codec and digital filter functions for each voice channel. Clare's PLI daughtercards support Loop Start and Ground Start operation, pulse dial operation, and regulatory surge protection.

The FXO evaluation platform includes a daughtercard featuring the Clare LITELINK III DAA device, providing high-voltage electrical isolation for CPE applications. The evaluation platform includes Legerity's WinSLAC software, which eases the computation of programmable filter coefficients and incorporate various impedances, and Legerity's VoicePath Script software, which allows the user to configure and control all aspects of the QLSLAC device.

Published in Embedded Systems (Europe) June 2002

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