UnitekFiber is a professional 25g dac cable factory, our 25G high-speed cable consists of a passive copper core cable and two SFP28-SFP28 interface optical fiber transceiver modules. The transceiver modules are shaped like optical modules, but there is no laser installed inside. 25G high-speed cables can replace 25G optical modules to achieve short-distance data transmission, and because there is no laser installed, the price is much lower than 25G optical modules. It is a better way for 25G switch short-distance interconnection applications in data centers. It is a common and cost-effective solution.
The 25G SFP28 Direct Attach Copper Cable (DAC) is a high-speed passive Twinax cable designed for short-range 25Gbps Ethernet links (up to 5m/7m). Compliant with SFF-8402 and IEEE 802.3by standards, this zero-power consumption solution is the gold standard for connecting 25G servers to 100G Top-of-Rack (ToR) switches. It offers near-zero latency and superior EMI shielding, essential for 5G database environments and AI compute clusters.
DAC cable is to provide cost-effective networking solutions for short distance connections. As an alternative to optical transceivers and fiber optic cabling, direct attach copper cable offer comparable performance at a lower cost, making them an economical choice for high-speed data transmission in limited network space. The internal material of the high-speed 25G SFP28 DAC cable is copper core, which is both energy efficient and environmentally friendly as it provides natural heat dissipation. The active optic cables typically consume around 440mW, but the direct attached copper cable do not require a power source, it could save on the on electricity costs.
The direct attach cable features with 25G SFP28 fiber transceiver, which is compatible with Cisco, Juniper, H3C, Huawei, Alcatel, Allied Telesis, Zyxel, Brocade, Mikrotik, Extreme, Blade, D-linnk Netgear, Finisar, ZTE, Linksys, SMC, Ruijie, Avaya, 3com, Enterasys, Redeback, Planet or etc.
At 25Gbps, passive copper cables must overcome high-frequency skin effects to maintain link stability.
| Feature | 25G SFP28 Passive DAC | 25G SFP28 AOC (Optical) |
| Transmission Rate | 25.78125 Gbps | 25.78125 Gbps |
| Power Consumption | < 0.1W (Passive) | ~1.0W per end |
| Max Reach | 5 Meters (Standard) | Up to 100 Meters |
| Latency | Lowest (Nanoseconds) | Microseconds (O-E Conversion) |
| Durability | High (Robust Copper) | Moderate (Fragile Fiber) |
lSwitches / Routers / HBAs/SAN, NIC cards
lServer & Storage Devices
lData Center Networking
lHigh Performance Compute
lFiber Channel
lInfiniBand QDR/DDR
l10Gbs/40Gbs Ethernet
The 25G SFP28 DAC is the cornerstone of Cloud Computing, NVMe Storage Clusters, and 5G Front-haul (eCPRI). It bridges the performance gap between legacy 10G and future 100G networks without the high cost of optical modules.
If you are looking for a potential DAC copper cable solution to solve network latency, utility costs or density issues, let UnitekFiber help. We are committed to providing high-quality DAC cable that undergo stringent testing procedures. Our meticulous approach encompasses every step, from careful material selection to rigorous performance evaluations. By adhering to these rigorous standards, our DAC cable are designed to deliver reliable and high-performance data transmission in even the most demanding network environments. With the incorporation of top-quality components and our unwavering commitment to stringent testing processes, the DAC cable has become the trusted choice for network professionals who seek unparalleled quality and performance.
Transitioning from 10G to 25G often introduces unexpected compatibility errors or airflow bottlenecks in high-density racks. At UnitekFiber, our goal is to simplify this migration for you. Whether you need advice on selecting the right AWG (30/28/26) for your specific distance or require multi-vendor coding for a heterogeneous environment, our engineering team is here to provide a tailored connectivity blueprint.
If you're facing intermittent link issues or planning a large-scale 25G rollout, let's talk about a solution that fits.
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Technically, most 25G DACs are backward compatible, but the host port must be manually configured to 10G speed. However, for pure 10G links, a dedicated 10G DAC is more cost-effective.
Yes, the 40G AOC/DAC cable has a QSFP+ to 4*SFP+ branch cable. Using this specification cable, the 40G port and the 10G port can be interconnected.
The reliable limit for passive 25G copper is generally 5 meters. For distances up to 7m or 10m, signal integrity becomes unstable, and we recommend switching to an Active Optical Cable (AOC).
The IEEE 802.3by standard requires RS-FEC or Base-R FEC for 25G copper links over 3 meters to compensate for signal attenuation and ensure error-free data transmission.
The longest transmission distance of copper cable DAC is 7M.
The transmission medium of DAC is copper cable.
The DAC cable offers a cost-effective solution without compromising on performance. After rigorous testing in our network environment, it has consistently delivered reliable data transmission.
This DAC Cable is easy to manage, and the short distance transmission capabilities are ideal for our cabinet to cabinet connections.
Good service, products came quickly and were exactly what I needed. Thank you!
UnitekFiber's 25G SFP28 DAC cable is simple to deploy, and the copper core not only provides natural heat dissipation but also makes it an environmentally friendly option. The DAC cable has withstood the test of time, performing flawlessly even during peak usage hours.
We've tested it in various network scenarios, and it has always performed reliably. The fact that it's compliant with multiple industry standards like ROHS gives us peace of mind. I'm looking forward to using more of UnitekFiber's products in our future projects.
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