22 May '15, 2pm

Backplane Optical Interconnects Speed Past Copper

The limitations of copper become more apparent when trying to move data at gigabit throughput. When running digital signals with clock rates over 20 GHz for any distance, the solution is fiber. System interconnects already incorporate fiber, and deployments like Verizon’s FiOS use fiber for the last-mile connections. Custom fiber chip-to-chip and board-to-board interconnects have made the rounds, but the technology is gaining more ubiquity among these applications. Standards like VITA 66.4 (see “Will Optics Spell The Death of the Copper Backplane?” ) are driving vendors to deliver products like Samtec’s FireFly product family (Fig. 1) . FireFly actually addresses copper and fiber with data rates up to 28 Gbits/s. A common connector is used to plug in modules that handle a dozen serial links via copper or fiber micro-ribbon cable. The protocol-agnostic system can handle Eth...

Full article: http://electronicdesign.com/interconnects/backplane-optic...

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Speed work during base training can cause more ...

runnersworld.com 26 May '15, 12pm

[SPEED WORK DEFINED: For this article, speed work refers to reps performed at your VO2 max pace (pace for an 8- to 10-minu...

Why marathoners should do speedwork too:

Why marathoners should do speedwork too:

runnersworld.com 23 May '15, 4pm

Sometimes it seems as though there are nearly as many marathon training programs as races. But if your marathon times have...