CN

Several different forms and applications of DAC products

Time: 2020-03-29
        I. DAC High-Speed Cable
        Direct Attach Cable (DAC), generally translated as direct-attach copper cable, is usually procured in fixed lengths. The cable assembly is equipped with fixed connectors at both ends, with non-replaceable ports; the modular head and copper cable cannot be separated. Due to its low cost, ease of use and high reliability, DAC holds a large share in the IDC (Internet Data Center) market. The following is a brief introduction to the different forms of DAC and their applications.
        II. Form Factors of DAC High-Speed Cables
        2.1 10G SFP+ to SFP+ DAC
        The 10G SFP+ to SFP+ DAC adopts a high-speed cable assembly that can be directly connected to the SFP+ ports of switches or network interface cards (NICs). It features high density, low power consumption, low cost and low latency.
10G SFP+ to SFP+ DAC
Figure 1: 10G SFP+ to SFP+ DAC
        2.2 25G SFP28 to SFP28 DAC
        The 25G SFP28 to SFP28 DAC provides customers with 25G high-bandwidth data interconnection capability. It complies with the IEEE P802.3by Ethernet standard and SFF-8402 SFP28 specification, and is widely used in data center and supercomputing center system scenarios.
Figure 2: 25G SFP28 to SFP28 DAC
        2.3 40G QSFP+ to QSFP+ DAC
        The 40G QSFP+ to QSFP+ DAC offers a highly cost-effective solution for establishing 40G links between intra-rack and inter-rack QSFP+ switch ports, enabling the upgrade of access layer uplinks to the core backbone to 40G. With its high speed and low latency, it is widely used in high-speed backbone networks, enterprise network switching and network storage systems.
Figure 3: 40G QSFP+ to QSFP+ DAC
        2.4 40G QSFP+ to 4×SFP+ DAC
        One end of the 40G QSFP+ to 4×SFP+ DAC is a 40G QSFP+ interface (complying with SFF-8436), and the other end is four 10G SFP+ interfaces (complying with SFF-8432). It is specifically designed for connecting 40G devices to 10G devices, realizing flexible rate adaptation.
Figure 4: 40G QSFP+ to 4×SFP+ DAC
        2.5 100G QSFP28 to QSFP28 DAC
        The 100G QSFP28 to QSFP28 DAC provides customers with 100G high-bandwidth data interconnection capability. It is equipped with 4 duplex channels, each supporting an operating rate of up to 25Gb/s, with an aggregated bandwidth of 100Gb/s. Compliant with the SFF-8436 specification, it is used for connecting devices with QSFP28 ports.
Figure 5: 100G QSFP28 to QSFP28 DAC
        2.6 100G QSFP28 to 4×SFP28 DAC
        The 100G QSFP28 to 4×SFP28 DAC has one 100G QSFP28 interface at one end and four 25G SFP28 interfaces at the other end, providing 100G high-bandwidth data interconnection capability. It complies with SFF-8665/SFF-8679, IEEE 802.3bj and Infiniband EDR standards, and is widely applied in data center and supercomputing center system scenarios.
Figure 6: 100G QSFP28 to 4×SFP28 DAC
        III. Applications of DAC High-Speed Cables
        DAC high-speed cables are mainly used for switch interconnections in data center server rooms. They are divided into two types: active DAC (AOC is not included here; active DAC integrates signal conditioning chips) and passive DAC (no additional chips, relying on cable performance). Passive DAC is suitable for short-distance connections (usually within 5 meters) due to its lower cost and power consumption, while active DAC can support longer distances (up to 10 meters) and is more stable in complex environments.
Figure 7: Applications of DAC High-Speed Cables
        Moduletek provides the products mentioned in this application guide. Welcome to place your orders!
        If you have any questions about the above content, please contact us via email: sales@moduletek.com
Back
PREVIOUS：Recognize MPO I : MPO connector
NEXT：Optical Modules for Commercial, Extended and Industrial Temperatures