A high-tech enterprise specializing in the research and development of optical fiber communications and manufacturing.
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A high-tech enterprise specializing in the research and development of optical fiber communications and manufacturing.
Copper cabling is the lowest cost, lowest latency, and lowest power way to interconnect high-speed systems together. DAC cables “directly attach” the electrical subsystems together, hence the name Direct Attach Copper cables (DACs). DAC copper cables are mainly used for inside system racks linking compute servers to storage subsystems within the 3-meter maximum length.
1. Offered in twin-port OSFP, OSFP, and QSFP112 ends
2. DACs offer length of 0.5m to 2-meters for straight cables, and up to 3-meters for splitters
3. Power consumption is 0.1 Watts per end
4. Thin 30AWG wire is used for short lengths up to 1-meter for 800G-to-800G cables
5. Thicker 26AWG wire with more shielding is used for 2- to 3-meters and splitters
6. Two different splitters cables are offered up to 3-meters for 1:2 400Gb/s 4-channeland 1:4 200Gb/s 2-channel ends for use in ConnectX-7 and BlueField-3 adapters
7. BlueField-3 uses only QSFP112, and ConnectX-7 is offered in both QSFP112 and OSFP
DAC Twin-port OSFP Straight and Splitters using OSFP and QSFP112 Ends
Is DAC Copper or Fiber?
DAC cables are made from shielded Twinax copper coaxial and are factory equipped with modules on either end connected to fixed ports. The modules cannot be removed from the cable. Therefore, all DAC cables are produced at a fixed length. The high-speed copper cable has excellent attenuation performance, low latency, and anti-interference in high-frequency broadband transmission.
What is Twinax Cable Used For?
Direct attached Twinax cable can be widely used in data center interconnection such as SATA storage devices, RADI systems, core routers, core switches, servers for 10G/40G/100G Ethernet, and InfiniBand. Generally speaking, this direct attach copper cable provides a cost-effective and high-performance solution for the following situations:
• Top of Rack(ToR)/Adjacent Rack – Either passive or active DAC cable is perfect for shorter ToR or rack-to-rack operations with cost-effective budgets.
• Middle of Row – Active DACs may be a better solution in this application, as long as the transmission distance is less than 15m.
• End of Row – DAC cables are ideal for the end of row architectures as long as the distance is within the 15 meters limit.
Most Common DAC Cables
10G SFP+ to SFP+ DAC
10G SFP + to SFP+ DAC adopts passive dual-axis cable assemblies and is directly connected to the SFP + module. It has the characteristics of high density, low power, low cost, and low delay.
40G QSFP+ to QSFP+ DAC
40g QSFP + to QSFP + DAC is a high-speed direct attach copper cable consisting of two 40G QSFP+ fiber transceivers and copper core, used for interconnection between 40G QSFP+ ports to 40G QSFP+ port with a transmission distance less than 7m.
25G SFP28 to SFP28 DAC
25G SFP28 to SFP28 DAC can provide customers with 25G high bandwidth Ethernet network interconnection capability. Conforming to IEEE p802.3by Ethernet standard and sff-8402 SFP28, it is widely used in data center or Super-computing Center system scenarios.
100G QSFP28 to QSFP28 DAC
100G QSFP28 to QSFP28 DAC provides data interconnection through 100G bandwidth and 4x duplex channels. Compliant with SFF-8436 Standard, every channel supports 25Gb/s rate and 100 Gb/s of bandwidth aggregation and is applied for Ethernet network connection between equipment with QSFP28 ports.
100G QSFP28 to 4×SFP28 DAC
One end of 100G QSFP28 to 4×SFP28 DAC has a 100G QSFP28 port, and the other end has four 25G SFP28 ports. Compliant with SFF-8665/SFF-8679、IEEE 802.3bj and Infiniband EDR Standard, it provides data interconnection through 100G bandwidth and is widely applied for system scenarios at data centers or HPC centers.
200G QSFP56 to QSFP56 DAC
The 200G QSFP56 Active Direct Attach Copper Twinax Cable is designed for use in 200GBASE Ethernet. They are suitable for very short links and Improve network efficiency for data center server and storage connections. This cable is compliant with IEEE 802.3cd by Ethernet standard and QSFP MSA Compliant. FiberMall 200G QSFP56 DAC Cable, used in 200G Ethernet, InfiniBand HDR, data center, and storage area network.
200G QSFP56 to 2x100G QSFP56 Breakout DAC
200G QSFP56 to 2x 100G QSFP56 Breakout AOC (Active Optical Cable) assemblies are designed to support 200G/2x100G Ethernet and InfiniBand HDR/HDR100. This breakout cable is compliant with IEEE 802.3cd, SFF-8665, and QSFP56 MSA standards. It provides a connection of a 200G QSFP56 port on one end and to two 100G QSFP56 ports on the other end and is suitable for data center and HPC (High-Performance Computing) links up to 70m (OM3) or 100m (OM4/OM5).
400G NDR OSFP to OSFP DAC
This is an OSFP to OSFP PAM4 Direct Attach Cable 28AWG that can connect two NVIDIA ConnectX-7 400G OSFP NICs with a 400G OSFP Flat-top DAC. It has a maximum data rate of 400Gb/s and an OSFP FLT to OSFP FLT connector.
400G OSFP to 2x200G OSFP DAC
400G OSFP to 2x200G QSFP56 Breakout Direct Attach Copper Cable provide reliable connectivity for data centers in demanding environments. It’s the second lowest-cost, lowest-latency, and very low-power consuming link available.
800G Infiniband NDR Twin-port OSFP to 4x200G QSFP112 DAC
An 800G twin-port OSFP to 4x200G QSFP112 InfiniBand NDR (Non-Data Rate) breakout DAC (Direct Attach Copper) cable is a passive copper cable that allows breaking out a single 800 Gigabit per second (800G) OSFP port into four 200 Gigabit per second (200G) QSFP112 ports for InfiniBand connectivity.
Why Choose DAC Cables Over Optical Transceivers?
1. High performance: DAC is suitable for short-distance wiring of the data center with its strong exchangeability of integration scheme;
2. Energy saving and environmental protection: The internal material of the high-speed cable is copper, which has a good natural heat dissipation effect and the qualities of energy-saving and environmental protection;
3. Low power consumption: Since the passive cable does not need power, the power consumption is almost 0.
4. Low cost: Copper cables are much cheaper than fiber, so using high-speed cables can greatly reduce the wiring costs of the entire data center.
