wiredInUSA January 2019

Adapt to low latency

Spectra7 Microsystems Inc has announced robust, error-free performance using Mellanox ConnectX-5 network adapters configured for ethernet low latency CA-N transmission. The testing included Spectra7-enabled active copper cables (ACC) up to 4m in length, which is double the length of passive direct attach cables (DAC) available for these demanding applications.

CA-N specification and requirements. Longer DAC cables require FEC which increases latency by up to 120ns per connection in each direction. The IEEE 100G CA-N specification was created to enable the lowest latency server-to-server connections for demanding artificial intelligence and deep learning applications. These connections can now span multiple racks, enabling larger radix switches and faster and more efficient computations.

Currently, only DAC cables with a maximum length of 2m can achieve the

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