High performance SERDES

Accelerant Networks has launched what it claims is the highest performance, lowest power SERDES serializer/deserialiser device available for backplane applications.

Accelerant Networks has announced what it claims is the highest performance, lowest power SERDES serializer/deserialiser device available for backplane applications.

The AN6420 is the newest member of its AN6000 family of high-speed SERDES transceivers that offers breakthrough 0% overhead technology for the highest performance, lowest power SERDES device available, demonstrating line rates of 10 Gigabit payloads (Ethernet or OC-192) across existing backplane differential pairs, without increasing the existing power budget.

The device’s four backplane interface cores require less than 870mW per 40 Gb/sec total payload, operating across FR4 material and two backplane connectors.

The AN6420 operates at 6.25 Gb/sec with a demonstrated rate up to 10 Gb/sec user payload in PAM4 multilevel signalling mode with no additional coding overhead (0 percent overhead), making it 25% more bandwidth efficient than typical 8B/10B coded transceivers. As with all Accelerant PAM4 transceivers, the AN6420 features adaptive equalisation performed by the part. For interoperation in legacy binary modes with SERDES on existing line cards, the AN6420 operates up to 5 Gb/sec with a Decision Feedback Equaliser (DFE) in the receiver enabling it to operate independent of the quality of the legacy link.

For legacy upgrades, the AN6420 includes the world’s first binary backplane DFE implementation, ensuring interoperability with the binary SERDES typical of the installed base of system line cards, enabling system developers to upgrade existing network, server, and system chassis backplanes to higher performance.

‘Maintaining a reasonable power budget, operating over low-cost interconnects, and interoperating with existing hardware have been the primary obstacles to upgrading existing backplanes to higher speed performance,’ said Bill Hoppin, vice president of marketing for Accelerant.

The AN6420 is a 17mm X 17mm low cost plastic BGA device, is sampling now, and is priced at $80 per unit in volume.

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