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Single-chip data transceivers serve short-haul links

Posted: 29 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:vativ technologies? transceiver? gbe? cat5e? cat6?

Vativ Technologies Inc. has begun sampling what it claims is the industry's only single-chip 10GbE transceiver for full-duplex operation over a single CAT5e or CAT6 unshielded twisted-pair (UTP) cable.

This transceiver enables the use of widely available, low-cost CAT5e and CAT6 cables, as well as off-the-shelf RJ-45 connectors, said Sreen Raghavan, Vativ Technologies' president and CEO. "This makes solutions based on the V10LAN the most economical for 10GbE backbones, costing less than a tenth of an equivalent short-reach optical solution."

The transceiver is implemented in 0.13-CMOS technology, with the host side supporting an IEEE 802.3ae-compliant 10GbE extended attachment-unit interface (Xaui). Full duplex transmission over UTP cabling is achieved through remodulating the Xaui data by using a multibit-per-baud modulation scheme.

Additionally, extremely powerful forward error correction (FEC) coding provides an additional 8 dB of coding gain to improve immunity to external noise. On the receiver side, an integrated custom digital signal processor implements high-performance adaptive equalization, echo and near-end cross talk/far-end cross talk (NEXT/FEXT) cancellation algorithms to enable robust, error-free reception.

The company is currently working with early adopters who are producing V10LAN-based Xenpak copper modules and 10GbE network interface cards (NICs) for the data center market. These devices will enable the population of Xenpak and PCI slots with a significantly cheaper alternativewithout requiring the replacement of existing Ethernet switches and corporate servers.

The transceiver includes a standard two-wire management data input/output (MDIO) interface for diagnostic information, status monitoring and control. The V10LAN's architecture permits easy implementation in a Xenpak form factor with the support of multisource agreement (MSA)-specific I/O and registers. The chip allows the use of a single low-cost 25MHz crystal oscillator to provide the reference clock.

Customer samples and evaluation modules are available now, with volume production scheduled for early Q3 of 2005. The V10LAN is priced at $135 each in 1,000-piece quantities.

- Bettyann Liotta

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