SAN JOSE, CALIF. Infineon Technologies Corp. has launched a dual-channel codec/single-channel SLIC chip set for two-channel analog termination. The three-chip DuSLIC set-comprising a codec and two single-channel SLICs-is optimized for access-network and customer-premises applications.
DuSLIC family members range from standard-feature and short-loop chip sets to full-feature devices with performance suitable for the central office. It complements Infineon's line codec and SLIC chip set product portfolio, which also includes the MuSLIC, a highly integrated solution optimized for centralized high-granularity line cards.
DuSLIC has a universal tone and fax detection circuit, allowing it to distinguish when optimum voice or data transmission is required. It offers integrated DTMF generation, DTMF decoding, caller ID and three-party conferencing-functions that either have been handled centrally or required a number of additional components and high-performance microcontrollers.
"It is now possible to meet worldwide line circuit requirements with a single hardware design that allows users to access different markets," said Uwe Hering, director of Infineon's communications customer solution center. He said that the chip set is based on a new DSP architecture and that it has a high level of software programmability.
Hering called the DuSLIC chip set "the first solution with a comprehensive set of system features for decentralized nodes." He cited cancellation of the echo directly at its point of origin as one example, saying that "this is the most efficient and most cost-effective method, especially for applications with longer signal delays such as wireless local loops or voice-over-Internet Protocol."
The chip set's high-performance rate-adaptive echo cancellation complies with ITU standard G.165. The function makes it possible to eliminate the echo where voice is digitized, which enables improved performance and eliminates the need for network-based echo cancellation.
Hering claimed that DuSLIC is also the first codec and SLIC solution to offer an integrated unbalanced sinusoidal ringing feature that, together with balanced ringing capability, allows maximum flexibility at low cost. No external components are needed for ringing generation or ring trip, and no external relays are necessary. Where external ringing is desired, the ring trip function and the relay drivers are integrated.
Infineon's SLIC technology supports voltage in excess of 170 V, allows the generation of an internal sinusoidal ringing signal amplitude of up to 85 V and supports the 140-V Message Waiting function used in PBX applications without the need for an external relay.
Advanced Fibre Communications is among the first companies to use the chip set. "DuSLIC should allow us to meet the cost and feature requirements of the multiservice access-platform market," said Duncan Gray, principal engineer at the Petaluma, Calif., company.
"The Infineon DuSLIC chip set is industry's first codec /SLIC to be optimized for both voice and modem data transmission," Gray added. "It has high-performance line interface capability for voice transmission that exceeds all worldwide specifications, and it combines optimum voice and modem transmission performance with extremely low power consumption."
Built-in test and diagnostic functions allow continuous monitoring of the line conditions without external hardware. That makes metallic test access, in which external test equipment is switched to the line via relays, obsolete.
Pricing in 10,000-piece quantities is $13 for the dual-channel chip set.
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EETInfo No. 612