High-Quality 40g Dac Cable Factories & Product

Featured High-Speed Copper Interconnects

Engineered to meet the stringent demands of modern hyperscale cloud computing, optical transport networks, and low-latency enterprise backbones.

China SFP-H10GB-CU1M Compatible 10G SFP+ Passive Direct Attach Copper Twinax Cable Factory, Product

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ODM Cisco QSFP-100G-CU1M Compatible 100G QSFP28 Passive Direct Attach Copper Twinax Cable Manufacturers, Pricelist

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Understanding the 40G DAC Cable Architecture

Direct Attach Copper (DAC) cables, particularly the 40G QSFP+ twinax cables, represent the pinnacle of cost-effective, low-latency transmission for short-range data center applications. Operating under the Multi-Source Agreement (MSA) standards, these cables utilize a passive twinaxial copper design to directly hook up physical transceivers. By bypassing the need for optical-to-electrical conversions, they lower both system power draw and latency overheads.

For data center managers, cloud providers, and system integrators, selecting high-quality 40G DAC cables is key to maintaining stable link-layer networks. High-quality physical layers prevent packet loss, reduce Bit Error Rates (BER), and maintain system-level signal integrity. This is especially true at high-frequency ranges up to 10 GHz per channel across four independent lanes (4x10G).

KOCENT OPTEC LIMITED has spent over a decade perfecting these complex physical layups. We ensure every assembly exceeds standard electrical parameters like insertion loss and near-end crosstalk (NEXT). Our designs support legacy switches and next-gen spine-leaf networks alike.

Kocent Optec Limited High-Tech Production Facility

The Engineering Physics Behind 40G QSFP+ Twinax Integrity

Designing a high-performance 40G DAC cable is not just about connecting copper wires. It requires managing complex physical behaviors at high frequencies. When data rates reach 10 Gbps per lane, copper behaves more like a high-frequency waveguide. Controlling manufacturing tolerances becomes critical to maintaining signal integrity.

Optimal Insertion Loss

Our twinax cables utilize silver-plated solid copper conductors, paired with advanced foamed polyolefin insulation. This material mix keeps insertion loss at a minimum, ensuring reliable transmissions over distances up to 7 meters without signal degradation.

Impedance Control

We hold our differential impedance to a tight tolerance of 100 ± 5 ohms. This strict control prevents signal reflections and minimizes jitter, ensuring the cable maintains its target Bit Error Rate (BER) of less than 1E-15 under full system load.

EEPROM Coding

Compatibilities vary across switch manufacturers. We pre-code every EEPROM module with custom firmware to match the required host vendor signature (such as Cisco, Arista, Juniper, Dell, or Mellanox), guaranteeing smooth plug-and-play integration.

Conductor Selection: 24 AWG to 30 AWG

Choosing the correct wire gauge is a vital tradeoff in data center layout design. Thicker copper conductors (such as 24 AWG or 26 AWG) exhibit less attenuation, making them ideal for longer runs of 5 to 7 meters. However, they are also heavier and stiffer. Conversely, thinner conductors (30 AWG) are highly flexible and improve air flow in dense server racks, but are best kept to shorter runs of 0.5 to 2 meters. KOCENT OPTEC LIMITED helps engineering teams analyze these factors to build optimized patch layouts that minimize cabling weight and physical airflow resistance.

Technical Feature / Parameter	40G QSFP+ Passive DAC (Industry Target)	KOCENT OPTEC Premium Standard	Direct Customer Advantage
Conductor Material	Standard copper wire	Silver-Plated Solid Copper (Ultra-Pure)	Less high-frequency skin-effect loss
Differential Impedance	100 ± 10 Ω	100 ± 5 Ω	Fewer signal reflections and errors
Raw Cable Shielding	Single layer braid	Dual-layer Alu-Mylar + 85% Braid	Highly resistant to electromagnetic noise (EMI)
Bit Error Rate (BER)	1E-12	Passes 1E-15 testing standards	Fewer packet drops and retransmissions
Jacket Fire Rating	PVC / Standard Grade	LSZH (Low Smoke Zero Halogen) / OFNP	Fully compliant with international safety codes

High-Precision Fiber Polishing and Termination Process

KOCENT OPTEC LIMITED: A Decade of Telecom Excellence

Established in 2012 in Hong Kong as a high-tech communication enterprise, Kocent Optec Limited has grown into one of China's premier fiber optic termination and high-speed copper interconnect manufacturers. We focus on design, fabrication, and custom tuning for both passive and active networking solutions.

With over 13 years of technical experience in manufacturing telecommunication components, our operations strictly follow international fiber-optic and electrical standards. We leverage mature, scientific quality control methodologies. This allows us to guarantee that 100% of our products undergo thorough inspection and testing before shipping, delivering them on time without compromises.

Our collaborative philosophy positions us as a trusted partner rather than just another hardware vendor. We believe our production capabilities and technical design services provide our clients with a distinct competitive advantage in their local markets.

2012

Founded in HK

13+

Years of OEM/ODM Expertise

100%

Inspected and Tested

50+

Global Telecom Operators Serviced

China Factory 4.0: Supply Chain Resilience & Precision Production

Modern data center buildouts demand quick lead times and high component consistency. Our production facility incorporates "Industry 4.0" automation methodologies. This setup integrates automated wire stripping, laser-controlled solder stations, and robotic testing arrays to minimize production variances.

Operating inside China's primary tech manufacturing corridor gives us access to a highly integrated supply chain. From raw copper drawing to customized outer casing injection molding, we keep our operations streamlined. This vertical integration keeps production costs low while protecting us from material shortages.

To assure top quality, we test all copper assemblies on Keysight physical layer test platforms. We run comprehensive sweeps for insertion loss, return loss, and crosstalk parameters, confirming that every cable meets MSA standards before packaging.

Advanced Multi-mode and Single-mode Optical Component Assembly

Global Reach & Commercial Scenarios

Our commitment to delivering reliable, cost-effective solutions has earned us a global customer base. Today, we work with operators and system builders across East Asia, Southeast Asia, the Middle East, Eastern and Western Europe, North and South America, as well as Africa.

Our OEM and ODM components have successfully won major public tenders, meeting the strict requirements of top-tier telecommunications carriers. We are proud to supply and integrate equipment for leading operators worldwide, including:

Tier-1 Global Operators

SingTel, Vodafone, America Movil, Telefonica, Orange, TeliaSonera, Saudi Telecom, Telenor.

Fast-Growing Networks

Bharti Airtel, VimpelCom, MTN, Viettel, Bitel, VNPT, Laos Telecom, MYTEL, Telkom.

Regional Carriers

Telekom, Entel, FiberTel, StarFiber, Ooredoo, Beeline, Azercell, and more.

Technical FAQ & Engineering Resources

Get answers to the most common technical questions about 40G QSFP+ DAC cable deployment, physical parameters, and host device compatibility.

Q1: What is the maximum recommended length for a passive 40G QSFP+ DAC cable?

For passive 40G QSFP+ copper cables, the standard maximum length is 7 meters. Beyond 7 meters, high-frequency signal attenuation typically exceeds the link-budget parameters defined by IEEE 802.3ba, which can lead to high Bit Error Rates (BER). For links exceeding 7 meters, we recommend switching to Active Optical Cables (AOCs) or optical transceivers.

Q2: Can a 40G QSFP+ DAC cable break out into 4x 10G SFP+ links?

Yes. By using a passive breakout DAC cable, you can split the 40G QSFP+ port on your switch into four individual 10G SFP+ connections. This configuration is widely used to connect 10G servers directly to a 40G Leaf switch without purchasing extra optical transceivers.

Q3: How does Kocent Optec handle EEPROM compatibility across different switch brands?

We use advanced EEPROM programmers to write brand-specific firmware to the MSA-standard registers. This allows our cables to identify correctly on hosts like Cisco, Arista, Juniper, Dell, and HPE, avoiding hardware lockout screens or warning messages.

Q4: What is the main difference between Active DAC and Passive DAC?

Passive DACs do not contain active electronics; they simply route signals over a direct copper pair. This keeps power consumption near zero (~0.1W) but limits distance to 7m. Active DACs (ACCs) contain built-in signal equalization and amplification circuitry in the connector, extending the practical copper reach up to 10m at the cost of higher power draw (~0.5W to 1W).

Q5: Why should I choose 40G DAC cables over optical transceivers for intra-rack connections?

DAC cables offer two major advantages for short distances: lower cost and lower latency. DACs can be up to 70% cheaper than optical modules and fibers. They also operate with near-zero latency, as they do not require optical-to-electrical conversions, making them the preferred choice for high-frequency trading (HFT) and high-density cluster connections.

Q6: How do you guarantee the quality of each cable?

We follow strict Quality Management standards. Every cable is subjected to physical inspection, continuity testing, and high-frequency parameter sweeps using vector network analyzers. We also run real-world switch loopback tests to verify zero-packet-drop performance before shipping.

Q7: Are your cables compliant with RoHS and CE directives?

Yes, our entire product portfolio conforms to RoHS environmental restrictions, as well as CE, FCC, and REACH standards. We use lead-free assembly processes and low-smoke halogen-free materials to help our clients meet strict green building and regional environmental requirements.