40G QSFP+ high speed cable (DAC) adopts copper cable as transmission medium, which has two kinds of passive and active. The 40G QSFP+ passive high-speed cable does not need power supply, and its power consumption is low, but the transmission distance is also short; the transmission distance of 40G QSFP+ active high-speed cable is longer. According to the different connectors at both ends of copper cable, the 40G QSFP+ high-speed cable can also be divided into the following two types:

1、40G QSFP+ to QSFP+ direct attach cable

Both ends of the high-speed cable are pre terminated with QSFP+ connectors, which are suitable for connecting two 40G network devices. The passive transmission distance is generally less than 5m, and the active transmission distance is longer.

2、40G QSFP+ to 4*SFP+ direct attach cable

This high-speed cable is connected with QSFP+ connector at one end and four 10G SFP+ connectors at the other end. It is used to connect 40G equipment and 10G equipment, and is suitable for 10G and 40G network connection.

Compared with active optical cable, high-speed cable has shorter transmission distance and is mainly used in the interconnection between equipment in data center computer room. The 40G QSFP+ high speed cable (DAC) provided by etu-link has the following advantages:

1. Low power consumption

2. High transmission stability

3. Good confidentiality

4. Anti interference

5. Large communication capacity

6. Good heat dissipation

In order to meet the growing demand for high-speed data, many data centers are migrating from 10G to 40G or even 100G. High speed cable DAC has become the most popular solution in 40G network wiring with low cost.