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ST unveils new ADSL chipset

Posted: 22 Jun 2005 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? reference board? copperwing12e? chipset?

STMicroelectronics announced samples and reference boards of its CopperWing12e chipset for adsl2++ central office (CO) equipment. The new 12-port second-generation solution embeds an enhanced ATM/IP (Asynchronous Transfer Mode/Internet Protocol) cell processor with fast connection speeds and high real-time processing capability. With the additional GMII (Gigabit Media Independent Interface) Ethernet interface, ST said, its latest ADSL chipset sets new standards for CO devices that transfer signals from multiple customer connections onto a high-speed backbone line.

The GMII interface allows the CopperWing12e chipset to connect directly to the CO's IP backplane, as well as to chain several data-pump devices on the same line card, eliminating the need for an external traffic aggregator or an Ethernet switch.

The CopperWing12e chipset integrates all ADSL functions from the ATM/IP interface to the line in three devices. The STLC60243 dual-channel ADSL line driver handles high-speed signals over a large bandwidth with a very low distortion rate, while the STLC60454 four-channel ADSL analog front end connects the line driver and hybrid balance circuit with the digital modem chip. According to the press release, the key component of the chipset is the Discrete Multi-Tone (DMT) data-pump with 12 independent transceivers, offering bit rates up to over 26Mbps downstream and 3Mbps upstream.

Customers can either choose to combine the ATM DMT data-pump (STLC61265) with their existing on-board cell processor, or to benefit from ST's new PerFlow processor, embedded in the transceiver chip (STLC61266). The PerFlow processor provides configurable backplane interfaces (ATM and IP) and performs all processing functions at real-time rates up to 600Mbps, achieved by doubling the number of the processor instances in the chip compared with the product's previous generation.

The new chipset supports multiple ADSL standards, including legacy protocols, as well as a number of advanced features, such as the Reach Extended ADSL (G.992.3 Annex L), lengthening the subscriber loop beyond 6.6km, and the Enhanced Upstream (G.992.3 Annex M) with bit rates up to 3Mbps.

The complete CopperWing12e development kit is already sampling at a price of $9 per line for 10,000 lines using the STLC61265-based chipset (the ATM version without an integrated network processor), and $9.95 per line for 10,000 lines using the STLC61266-based chipset (the IP version with an integrated network processor). Mass production is scheduled in Q4 2005.

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