H3C SFP-25G-D-CAB-2M-A Compatible 25G SFP28 to SFP28 DAC Cable 2m (7ft) Passive Direct Attach Copper Twinax Cable-HYTOPTODEVICE

The HYTOPTODEVICE SFP-25G-D-CAB-2M-A dac sfp28 25g is 100% verified for:

• H3C S6800 Series: S6800-32Q, S6800-54QT, S6805-54HF, S6820-54HF.

• H3C S6850 & S6860 Series: High-performance 25G/100G data center leaf switches.

• H3C S9800 Series: Core/Spine switches (S9810, S9820, S9850).

• H3C UniServer Platforms: R4900 G3/G5/G6, R4700 G5 (with 25G SFP28 NICs).

• H3C UniStor: X10000 G3/G5 storage arrays.

• H3C IRF Stacking: The 2m length is perfect for stacking H3C S6800 switches across different rack units or adjacent racks.

• Top-of-Rack (ToR) Aggregation: Connecting 25G servers located at the bottom of a 42U rack to H3C leaf switches at the top.

• Low-Latency Storage Fabric: Providing a reliable 25Gbps physical layer for NVMe-over-Fabrics (NVMe-oF) between H3C switches and high-speed storage nodes.

Connectivity Solutions(Applications)：

Scenarios 1:25G-to-25G Link for Switch-to-Switch

Scenarios 2:25G-to-25G Link for Switch-to-Server

FAQ for H3C SFP-25G-D-CAB-2M-A Compatible DAC SFP28 25G Cable

Q1:Is this 25G SFP28 cable natively backward compatible with 10G SFP+ ports? A:Although SFP28 and SFP+ connectors are physically identical, standard SFP28 25G DAC is programmed as high-speed devices. Most ports that support only 10G cannot recognize 25G-coded cables due to a mismatch in EEPROM identifiers. 

Q2:How far can I run a SFP28 25G DAC cable?A:Because DAC cables are made of dual-core copper wire, they are relatively heavy and experience signal attenuation at a faster rate than fiber optic cables; therefore, the actual transmission distance for SFP28 25G DAC cable is limited to 7 meters or less.

Q3:What is the power consumption of this passive SFP28 25G DAC compared to 25G SR optics? A: HYTOPTODEVICE passive 25G DAC consumes near zero power (≤0.5W) and generates no heat. By comparison, a pair of 25G SR fiber optical transceivers consumes approximately 1.5W to 2.0W of power. For a rack containing 48 servers, switching to the HYTOPTODEVICE 25G DAC can save nearly 100W of power and significantly reduce the cooling load.

Q4:Will this 25G cable cause an "Unsupported Transceiver" error in h3c switches?A:No. DAC Manufacturer China HYTOPTODEVICE uses precise h3c EEPROM coding. Your device will recognize this 25g sfp28 cable as a genuine H3C SFP-25G-D-CAB-2M-A, ensuring 100% compatibility.

Q5:Does 25G SFP28 DAC use Multi-mode or Single-mode fiber?A:Neither. The DAC(Direct-Attach Copper) is a copper cable. using a twinaxial copper architecture (Twinax) to transmit electrical signals directly, no light signals.There are not lasers or optical glass in DAC cable,  it is much cheaper than fiber optics.

Q6:Will this cable trigger "Unsupported Transceiver" alarms in H3C devices?A:No. HYTOPTODEVICE cables are pre-programmed and feature a genuine H3C-specific EEPROM signature. Your switch will recognize the cable as a genuine H3C SFP-25G-D-CAB-2M-A, ensuring zero CLI warnings and full diagnostic support.

Q7:Is 25G SFP28 DAC hot-swappable?A:HYTOPTODEVICE SFP28 25G DAC is hot-pluggable, hot Pluggable SFP28 Compliant.you can plug or unplug the passive DAC, while the device is powered on without damaging the hardware.

Q8:Will this 25g sfp28 dac cable work in an older 10G SFP+ port?A: No.A standard 10G SFP+ port may not recognize a 25G DAC cable. This 25g cable is designed for SFP28 (25G) ports. 10G SFP+ port will not typically link up with a 25G DAC. For 10G links, we recommend the 10G SFP+DAC cable.

Q9:Is 30AWG wire gauge enough for 25G at 1 meter？A: Yes,That is absolutely correct. For a transmission distance of 1 meter, 30 AWG cable strikes the optimal balance between flexibility (for easy cabling within Juniper racks) and signal integrity, exceeding the requirements for 25GbE copper links specified in the IEEE 802.3by standard.

Q10:What is the difference between "Passive" and "Active" DAC?There are distinct differences between Passive and Active DAC.The Passive DAC has no signal amplification. its lengths is under 7m. With zero power consumptions,it cost is cheaper. The Active DAC contains a chip to boost the signal. Used for slightly longer copper runs (up to 10m-15m) and is generally thinner/more flexible.

Q11:Can I plug a 25G DAC into a 10G SFP port?A:No. SFP28 (25G) ports can often accept 10G transceivers, but a 10G SFP port cannot scale up to recognize a 25G DAC cable. You should Make sure the cable speed matches the port with the lowest rated speed.

Quality Assurance：Your Trusted Optical Transceiver Source

 HYTOPTODEVICE is a vertically integrated manufacturer of high-performance optical transceivers. By controlling core materials at the source, we ensure every SFP module meets the highest standards of reliability and customization.

• Vertical Integration: In-house core material production ensures a stable, self-sufficient supply chain for all optical modules.

• Total Traceability: End-to-end oversight from raw components to final transceiver assembly guarantees 100% controllability.

• Bespoke Solutions: Expert-led R&D provides customized SFP transceiver designs tailored to your specific technical needs.

• 24-Hour Response: Our technical team guarantees a primary response to any inquiry or quality concern within 24 hours.

Carrier-Grade Quality. Factory-Direct Control. Rapid Response.

Quality Certification & Compliance：

 At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From fiber optical transceiver manufacturing to final inspection, our processes ensure global compliance and reliability.

We adhere to rigorous standards for our SFP modules and network solutions:

• ISO 9001: Certified quality management and production consistency.

• CE & FCC: Fully compliant for seamless Global Market Access.

• RoHS: Committed to environmental responsibility and hazardous material control.

• Proven Reliability: Rigorous testing to reduce compliance risk and ensure safety.

Certified Quality. Global Standards. Guaranteed Performance.

Rigorous Industrial Product Testing：

   

100% 3rd Party Compatible：

Partial Test Demonstration：

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