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New crosspoint switch handles equalization

Posted: 03 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:loring wirbel? vitesse semiconductor? crosspoint switch chip? crosspoing switches? PixEQ technology?

Vitesse Semiconductor Corp. has launched a 12-port crosspoint switch chip with equalization as part of a recasting of its high-speed product lines into the Signal Integrity series. The common theme for the portfolio of asynchronous crosspoints, crosspoint switches with clock/data recovery, protocol retimers and Sonet transceivers is the preservation of noise margins in backplane and cabling environments operating at up to 11Gbps.

Product-marketing manager Juan Garza said that despite the advent of new backplanes like the Advanced Telecom Computing Architecture, most current backplane designs are being implemented at speeds of 1-3Gbps, although Vitesse engineers predict that a need will soon arise for 4-10Gbps.

The VSC3312 backplane device is the first crosspoint switch to embed Vitesse's new PixEQ technology, combining equalization and pre-emphasis. The switch offers programmable input-signal equalization along with output signal pre-emphasis, compensating for multiple impairments in a signal path. Equalization works independently of the data rate, compensating for deterministic jitter.

The switch supports storage protocols such as serial-attached SCSI and Serial ATA by detecting and transmitting loss-of-signal, to provide native out-of-band support in storage applications.

All I/O ports are independently programmable, giving the switch nine combinations ranging from 8:16 to 16:8. The switching core is fully nonblocking and multicasting. Power consumption is 160mw per channel.

The VSC3312 is packaged in a 15mm x 15mm, 196-pin PBGA and operates from a single 2.5V supply. It is priced in volume at $36 each. Other Signal Integrity switches are due later this year.

- Loring Wirbel
EE Times

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