40G QSFP+ Direct Attach Copper Cabling

In today’s network building, requiring higher speeds, greater scalability and cost-effective cabling solution is preferable. Direct Attach Cable(DAC) is a kind of optical transceiver assembly widely applied in storage area network, data center, and high-performance computing connectivity etc and high density cabling interconnect system capable of delivering an aggregate data bandwidth of 40Gb/s,therefore, It is the cost-effective way to upgrade from 10G to 40G or 40G to 40G interconnect connection.

40G QSFP+ Direct Attach Copper Cable (DAC) Basics

40G QSFP+ Direct Attach Copper Cable (DAC) is a high speed twinax cable with QSFP+ connector on either end of the cable. It is designed to meet emerging data center and high performance computing application needs for a short distance and high density cabling interconnect system capable of delivering an aggregate data bandwidth of 40Gb/s. The maximum transmission distance of QSFP+ direct attach copper cable is 10 meters, which makes the cable suitable for in-rack connections between servers and Top-of-Rack (ToR) switches because they often require shorter distances and not routed to the Main Distribution Frames.

How to Use 40G QSFP+ Direct Attach Copper Cable

According to the connector types on both ends. One is QSFP+ to 4 SFP+ direct attach breakout copper cable, and the other is QSFP+ to QSFP+ direct attach copper cable. In fact, it is not common for there is a third type QSFP+ direct attach copper cable called QSFP+ to 4 XFP breakout cable. For a QSFP+ to 4 SFP+ direct attach breakout copper cable, it has a QSFP+ connector on one end and four SFP+ connectors on the other end. In terms of a QSFP+ to QSFP+ direct attach copper cable, it has a QSFP+ connector on both ends of the cable. When we use a fiber optic transceiver and patch cable to establish a fiber link, we should firstly plug the transceiver to the switch and then plug the patch cable to the transceiver. But for a QSFP+ direct attach copper cable, either SFP+ connector or QSFP+ connector, before building the network, it is necessary to buy 40G DAC cables from reliable QSFP cables supplier and manufacturer.can be both directly inserted into the switch and don’t need a transceiver at all, which provides a really cost-effective solution for interconnecting high speed 40G switches to existing 10G equipment or 40G switches to 40G switches.

40G QSFP+ to 4 SFP+ Direct Attach Copper Cabling

The move from 10G to 40G Ethernet will be a gradual one. It is very likely that one may deploy switches that have 40G Ethernet ports while the servers still have 10G Ethernet ports. For that situation, we should use a QSFP+ to 4 SFP+ direct attach breakout copper cable.In 40G to 40G connection, QSFP+ to QSFP+ direct attach copper cables are suitable for very short distances and offer a highly cost-effective way to establish a 40G link between QSFP+ ports of QSFP+ switches within racks and across adjacent racks. These QSFP+ copper cables connect to a 40G QSFP port of a switch on one end and to another 40G QSFP port of a switch on the other end. It is noted that the distance between the two switches is within the cable length.  These cables connect to a 40G QSFP Port of a switch on one end and to four 10G SFP+ ports of a switch on the other end, which allows a 40G Ethernet port to be used as four independent 10G ports thus providing increased density while permitting backward compatibility and a phased upgrade of equipment. As a lower cost alternative to MTP/MPO breakouts for short reach applications up to 5 meters, it helps IT organizations achieve new levels of infrastructure consolidation while expanding application and service capabilities.

40G QSFP+ to QSFP+ Direct Attach Copper Cabling

QSFP+ to QSFP+ direct attach copper cable are suitable for very short distances and offer a highly cost-effective way to establish a 40G link between QSFP+ ports of QSFP+ switches within racks and across adjacent racks. These cables connect to a 40G QSFP port of a switch on one end and to another 40G QSFP port of a switch on the other end. Supporting similar applications to SFP+, these four-lane high speed interconnects were designed for high density applications at 10Gb/s transmission speeds per lane. One QSFP+ to QSFP+ direct attach copper cable link is equivalent to 4 SFP+ cable links, providing greater density and reduced system cost. Passive and active QSFP+ to QSFP+ direct attach copper cables are both available. With a active QSFP+ to QSFP+ direct attach copper cable assembly, the connection is capable of distances of up to 10 meters.

Why Use 40G QSFP+ Direct Attach Copper Cable (DAC)?

For 40G short reach applications, 40G QSFP+ direct attach copper cable provides simple and inexpensive cabling solution.

The main advantages in following.

•  Robust
•  Cheap
•  Low-power Consumption
•  Easy Operation

Conclusion

With the wide deployment of 40 Gigabit Ethernet, the 40G QSFP+ direct attach copper cables are becoming more and more popular due to the compact size, low power and cost-effectiveness. Fiber-Mart supplies various kinds of high speed interconnect DAC cable assemblies including 10G SFP+ Cables, 40G QSFP+ Cables, and 120G CXP Cables. All of our direct attach cables can meet the ever growing need to cost-effectively deliver more bandwidth, and can be customized to meet different requirements. For more information, welcome to visit www.fiber-mart.com.or contact us .E-mail: [email protected]