What Is Direct Attach Copper Cable?
Direct attach copper cable, which also is named DAC Cable, a form of optical transceiver assemblies used to connect switches to routers and/or servers. There are various versions of direct attach copper cables with different specifications on the market today which make us in difficult choices. So, what should be considered when we buy the direct attach copper cable?
Passive Direct Attach Copper Cable & Active Direct attach cable
A passive direct attach copper cable, such as the 10G SFP+ DAC cable, is effectively viewed as a transparent cable to the switch and requires little to no direct power to operate. A passive cable therefore passes the signal through it without any modification or processing such as amplification or equalization. While active direct attach copper cable contains electrical components in the connectors that boost signal levels that make data available to transmit for longer distance. In general, active direct attach copper cables are slightly more expensive than the passive cable.
How to determine which type should be used? In addition to the consideration of cost and transmission distance, the most reliable method is to check the compatible matrix of your switch. Because some of the switch may not support the passive version, like Brocade VDX.
Rollball’s direct attach cables divided into 10G SFP+ cable, 40G QSFP+ Cable, 100G QSFP28 Cable based on the different data rate request. As well as DAC Cables have breakout cables, such as 40G QSFP+ to 4x10G SFP+ DAC cable, 100G QSFP28 TO 4X25G SFP28 DAC cable.
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