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40G QSFP+ DAC knowledge sharing
March 02,2018 09:10:36

Compared with the optical module, the biggest advantage of the Direct Attach Cable is the cost saving. As the 40G network is becoming more and more popular, the 40G QSFP+ DAC is getting more and more attention.

From the type of cable, QSFP+ cable can be divided into QSFP+ DAC cable and QSFP+ AOC cable. Among them, QSFP+ DAC cable can also be subdivided into QSFP+ passive DAC cable and QSFP+ active DAC cable. Today we mainly introduce QSFP+ DAC cable.



As a low cost alternative solution to a 40G optical module, QSFP+ DAC has been widely used in 10Gigabit network Card, 10Gigabit switches, servers, supercomputers, cloud computing, cloud storage network and other short-range interconnection.


The DAC cable is usually composed of a copper core cable and two optical modules. Because of the seamless connection between optical module and cable, not only ensure that the optical port is not exposed, reducing the impact of dust and other pollutants on the optical fiber cable, but also reducing the cost, simplifying the installation, so it is widely praised.


Compared with the traditional cable, the 40G QSFP+ DAC cable has the following features:

² Transmission distance: The transmission distance is shorter, is suitable for the short-distance wiring of the data center. The maximum transmission distance of the passive cable is about 5m, while the active cable can up to 15m.

² Material: The interior of the DAC cable is made of copper core. copper has the function of natural radiator, good heat dissipation, energy saving and environmental protection.

² Power consumption: DAC cable has low power consumption. Because the passive cable does not need power supply, the power consumption is almost 0. The power consumption of active optical cable is generally about 440mW, DAC cable has a certain advantages in energy consumption.

² Low cost: The copper price is far lower than the fiber, therefore, use DAC cable will also reduce the wiring cost for the entire data center.


QSFP+ DAC cable can provide higher performance, and the price and deployment cost are much lower than the optical transceiver. It is an ideal solution for short-distance connection between network devices. ETU-Link can supply high quality DAC cable, including 10G SFP+ to SFP+ DAC, 40G QSFP+ to QSFP+ DAC and 40G QSFP+ to 4xSFP+ DAC. These products will be tested on the switch before shipment, the quality is reliable, and can be perfectly compatible with CISCO, HUAWEI, H3C and other brand equipment. For more details, welcome to visit our website:

Related Tags : 40G QSFP+ DAC QSFP+ optical transceiver 40G Direct Attach Cable

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