Q1: What is a Direct Attach Cable (DAC)?
A: A Direct Attach Cable (DAC) is a high-speed copper cable with transceivers permanently attached at both ends, used for short-distance data transmission between switches, servers, and network devices.
Q2: What data rates are supported by DAC cables?
A: DAC cables support a wide range of data rates, including 10G, 25G, 40G, 100G, 200G, 400G, and 800G, depending on the cable type and connector form factor.
Q3: What are the main advantages of using DAC cables?
A: DAC cables offer low latency, low power consumption, high reliability, and cost-effective short-distance connectivity compared to optical transceivers and fiber cables.
Q4: What is the typical transmission distance for DAC cables?
A: DAC cables are typically used for short distances, usually ranging from 0.5m to 5m, with some configurations supporting up to 7m depending on data rate and cable quality.
Q5: What is the difference between passive and active DAC cables?
A: Passive DAC cables do not require power and are used for very short distances, while active DAC cables include signal conditioning to support longer distances and higher data rates.
Q6: Are DAC cables compatible with Cisco, Juniper, and HPE devices?
A: Yes. These DAC cables are fully compatible with Cisco, Juniper, HPE, and other major networking brands, and are coded to meet MSA and device compatibility standards.
Q7: What connector types are used for DAC cables?
A: DAC cables commonly use SFP+, SFP28, QSFP+, QSFP28, QSFP56, QSFP-DD, QSFP112, or OSFP connectors, depending on the supported data rate.
Q8: What is a DAC breakout cable?
A: A DAC breakout cable allows a single high-speed port to be split into multiple lower-speed ports, enabling flexible port utilization and network scalability.
Q9: What breakout configurations are available for DAC cables?
A: DAC breakout cables support configurations such as 1×2, 1×4, and 1×8, depending on the data rate and switch port capabilities.
Q10: Which data rates support DAC breakout cables?
A: Breakout DAC cables are commonly available for 40G, 100G, 200G, and 400G applications, supporting various fan-out configurations.
Q11: What is a 40G DAC breakout cable used for?
A: A 40G DAC breakout cable is typically used to split one 40G QSFP+ port into four 10G SFP+ ports for server or access-layer connectivity.
Q12: How is a 100G DAC breakout cable commonly configured?
A: A 100G DAC breakout cable is commonly configured as 1×100G to 4×25G or 2×50G, enabling flexible high-density network deployments.
Q13: What breakout options are available for 200G and 400G DAC cables?
A: 200G DAC cables can be configured as 1×200G to 2×100G or 4×50G, while 400G DAC cables support configurations such as 1×400G to 2×200G, 4×100G, or 8×50G.
Q14: Do DAC breakout cables require specific switch support?
A: Yes. The switch or router must support port breakout functionality and be properly configured in software to recognize the breakout ports.
Q15: Can DAC cables be used for top-of-rack (ToR) connections?
A: Yes. DAC cables are widely used for top-of-rack and server-to-switch connections due to their low latency, low power consumption, and cost efficiency.
Q16: Are DAC cables hot-swappable?
A: Yes. DAC cables support hot-swappable installation, allowing them to be connected or replaced without powering down network devices.
Q17: Do DAC cables support Digital Diagnostic Monitoring (DDM)?
A: Yes. Most active DAC cables support DDM, enabling monitoring of temperature, voltage, and signal parameters, while passive DAC cables may offer limited or no diagnostics.
Q18: What are common applications for high-speed DAC cables?
A: DAC cables are commonly used in data centers, cloud computing environments, HPC clusters, AI networks, and enterprise core or access-layer networks.
Q19: Are these DAC cables tested before shipment?
A: Yes. Each DAC cable is individually tested for signal integrity, compatibility, and performance before shipment to ensure reliable operation.
Q20: Can DAC cable length and compatibility be customized?
A: Yes. DAC cables can be customized in length and coded for specific switch or server models upon request.
Q21: What is the difference between DAC and AOC cables?
A: DAC cables use copper conductors for short-distance connections, while AOC cables use optical fiber and are suitable for longer distances with lighter weight and better EMI resistance.
Q22: What warranty is provided for DAC cables?
A: All DAC cables are backed by a standard warranty and professional technical support, ensuring long-term reliability and customer confidence.