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Leonard Brooks
5
Solid DAC cable with reliable connectivity.
QFX-QSFP-DAC-3M
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3M CABL QSFP+ TO QSFP+ ETHERNET DIRECT ATTACH COPPER TWINAX...
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Name:
QFX-QSFP-DAC-3M
- Description:
- 3M CABL QSFP+ TO QSFP+ ETHERNET DIRECT ATTACH COPPER TWINAX COPPER
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Juniper
- GTIN:
- 818214991652
- Condition:
- Warranty:
- 3
- List Price:
$240.00
- Price:
$57.0076.3% off
Quantity:
1
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QFX-QSFP-DAC-3M Overview
QFX-QSFP-DAC-3M is a high-performance direct attach copper cable engineered for high-speed connectivity in data centers and networking environments. Unlike power supplies that are characterized by wattage, modularity, ATX or SFX form factors, 80 PLUS certifications, input voltage ranges, and power factor correction, this DAC cable forgoes these attributes in favor of simplicity and reliability in passive signal transmission.
This product features no fans, bearings, or electronic protections typical of power systems; instead, it offers robust build quality with precision QSFP connectors at both ends, ensuring low latency and stable performance. Although aspects like fan size, noise levels, and common power supply protections are not applicable, QFX-QSFP-DAC-3M is ideally suited for common use cases such as enterprise data centers, high-performance computing switches, and modern networking deployments.
QFX-QSFP-DAC-3M price is $57.00, a 76.3% saving from the Juniper list price of $240.00. QFX-QSFP-DAC-3M is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QFX-QSFP-DAC-3M for additional pricing. Browse the full Juniper Power Supplies series or explore all Juniper products.
QFX-QSFP-DAC-3M Specifications
- Product Type
- N/A
- Wattage
- N/A
- Use Case
- Data Center
- Form Factor
- N/A
- Modularity
- Non-Modular
- 80 PLUS Certification
- None
- Rail Configuration
- N/A
- Certifications
- N/A
- Remote Monitoring
- N/A
- Input Voltage
- N/A
- Hot-Swap Capable
- N/A
- PFC (Power Factor Correction)
- N/A
- Fan Size
- N/A
- Fan Bearing Type
- N/A
- Zero RPM Mode
- No
- Efficiency Rating
- N/A
- Protections
- N/A
- ATX 24-Pin Connectors
- N/A
- EPS (CPU) 4+4 Pin
- N/A
- PCIe (6+2) Connectors
- N/A
- SATA Power Connectors
- N/A
- Molex Connectors
- N/A
- Floppy Connector
- No
- Cable Type
- Flat
- RGB Lighting
- No
- MTBF (Mean Time Between Failures)
- N/A
- Operating Temperature
- N/A
- Product Name
- QFX-QSFP-DAC-3M
- Height
- N/A
- Width
- N/A
- Depth
- N/A
- Weight
- N/A
QFX-QSFP-DAC-3M Use Case
Hyperscale Data Center Leaf–Spine Interconnect with QFX-QSFP-DAC-3M-3M
In a high-density cloud provider environment, network architects deploy QFX-QSFP-DAC-3M-3M twinax copper assemblies to link QSFP+ ports on ToR leaf switches directly to spine switches over 3 meters. This direct-attach copper solution delivers 40 GbE throughput with <0.5 µs latency, simplifies cabling management, and cuts per-link capex by up to 50 % versus optical modules—enabling ultra-fast east-west traffic, predictable performance at scale, and streamlined rack design.
Low-Latency HPC and AI Cluster Fabric Using 3 m QSFP+ Direct-Attach Copper
A research institution’s HPC and AI teams interconnect compute nodes and GPU servers via QFX-QSFP-DAC-3M-3M twinax cables to QSFP+ network cards and switches in adjacent racks. The short-reach copper links achieve consistent 40 GbE bandwidth and microsecond-class latency, accelerating MPI workloads and distributed training jobs. Leveraging plug-and-play DAC eliminates transceiver power draw, reduces cooling overhead, and maximizes usable rack U-space for compute density.
Cost-Optimized Hyper-Converged Infrastructure Networking
An enterprise IT group implements a VMware vSAN cluster across two adjacent racks, using QFX-QSFP-DAC-3M-3M twinax copper cables to link hypervisor hosts to aggregation switches. The 3 m copper twinax offers enterprise-grade reliability, zero management overhead, and 40 GbE connectivity at a fraction of optical module costs. As a result, the organization achieves sub-2 ms storage access latencies, simplifies cable runs, and lowers total cost of ownership for converged compute and storage resources.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| QFX-QSFP-DAC-3M |  JPSU-400W-AC |  JPSU-350-AC-AFO |  JPSU-650W-DC-AFI |  JPSU-850W-DC-AFI | |
|---|---|---|---|---|---|
| Product Type | N/A | Power Supply | Power Supply | Power Supply | Power Supply |
| Wattage | N/A | 400W | 400W | 650W | 850W |
| Use Case | Data Center | Gaming / Workstation | Gaming / Workstation / General Use | Gaming | Enterprise Server / Workstation / Gaming |
| Form Factor | N/A | ATX | ATX | ATX | ATX |
| Modularity | Non-Modular | Non-Modular | Non-Modular | Non-Modular | Modular |
| 80 PLUS Certification | None | 80 PLUS | Bronze | Gold | Gold |
| Rail Configuration | N/A | Single Rail | Single Rail | Single Rail | Single Rail |
| Certifications | N/A | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS | 80 PLUS / CE / FCC / UL / ROHS |
| Remote Monitoring | N/A | No | No | No | No |
| Input Voltage | N/A | 100–240V | 100–240V | 100–240V | 100–240V |
| Hot-Swap Capable | N/A | No | No | No | No |
| PFC (Power Factor Correction) | N/A | Active PFC | Active PFC | Active PFC | Active PFC |
| Fan Size | N/A | 120mm | 80mm | 120mm | 120mm |
| Fan Bearing Type | N/A | Fluid Dynamic | Sleeve | Fluid Dynamic | Fluid Dynamic |
| Zero RPM Mode | No | Yes | Yes | Yes | No |
| Efficiency Rating | N/A | 87% | 87% | 94% | 92% |
| Protections | N/A | OCP / OVP / SCP | OCP / OVP / SCP / OTP | OCP / OVP / SCP / OTP | OCP, OVP, UVP, SCP, OTP |
| ATX 24-Pin Connectors | N/A | 1 | 1 | 1 | 1 |
| EPS (CPU) 4+4 Pin | N/A | 1 | 1 | 1 | 1 |
| PCIe (6+2) Connectors | N/A | 2 | N/A | 2 | 2 |
| SATA Power Connectors | N/A | 4 | 2 | 6 | 6 |
| Molex Connectors | N/A | 2 | 1 | 4 | 2 |
| Floppy Connector | No | No | No | No | No |
| Cable Type | Flat | Sleeved | Flat | Sleeved | Sleeved |
| RGB Lighting | No | No | No | No | No |
| MTBF (Mean Time Between Failures) | N/A | 100,000 hours | 100,000 hours | 150,000 hours | 150,000 hours |
| Operating Temperature | N/A | 50°C | 50°C | 50°C | 50°C |
| Product Name | QFX-QSFP-DAC-3M | JPSU-400W-AC Power Supply | JPSU-350-AC-AFO Power Supply Unit | JPSU-650W-DC-AFI | JPSU-850W-DC-AFI |
| Height | N/A | 3.38 inches | 3.5 inches | 3.4 inches | 5.9 inches |
| Width | N/A | 5.9 inches | 5.5 inches | 5.9 inches | 5.5 inches |
| Depth | N/A | 5.51 inches | 5.9 inches | 5.5 inches | 3.4 inches |
| Weight | N/A | 6.6 lbs | 3.5 lbs | 5.0 lbs | 7.5 lbs |
Reviews & Ratings
M
Mark Ellison
5
Works perfectly for short range QSFP links.
T
Trevor Fielding
4
Good build quality and flexibility.
O
Oliver Grant
5
No signal issues experienced.
P
Philip Norris
5
Cost effective interconnect solution.
Questions & Answers
What is the QFX-QSFP-DAC-3M direct attach copper cable?
The QFX-QSFP-DAC-3M is a 3-meter QSFP+ to QSFP+ twinax copper cable optimized for 40 Gigabit Ethernet connections in data center environments.
What transmission speed does the QFX-QSFP-DAC-3M support?
This cable supports 40 Gbps full-duplex throughput, delivering low-latency, high-bandwidth connectivity between QSFP+ ports.
Which devices are compatible with the QFX-QSFP-DAC-3M?
It is fully compatible with Juniper QFX, EX, QFX-Series switches and any QSFP+ port that adheres to the SFF-8436 standard.
What type of connector does the QFX-QSFP-DAC-3M use?
The cable features two QSFP+ (Quad Small Form-factor Pluggable Plus) connectors on each end for direct module-to-module attachment.
What is twinax copper technology?
Twinax copper uses a twin-axial conductor design with superior crosstalk immunity and low insertion loss for reliable short-reach, high-speed links.
What is the maximum supported link distance?
The QFX-QSFP-DAC-3M supports reliable 40 GbE transmission up to 3 meters in standard data center environments.
How does this copper cable compare to optical transceivers?
Direct attach copper offers lower latency and power consumption, plus a lower total cost compared to 40 GbE optical transceivers and fiber.
Is the QFX-QSFP-DAC-3M hot-swappable?
Yes, the twinax cable supports hot-swap functionality, allowing insertion or removal without powering down the system.
What is the typical latency performance?
Latency is negligible—often under 100 ns per link—ensuring minimal overhead for high-performance compute and storage traffic.
What is the power consumption of the QFX-QSFP-DAC-3M?
Power draw is typically under 0.5 W per end, minimizing thermal output and overall system power budget.
What operating temperature range is supported?
This cable is rated for 0 °C to 70 °C (32 °F to 158 °F), suitable for standard rack environments.
Is the QFX-QSFP-DAC-3M vendor-certified?
Yes, it is factory-qualified and tested by Juniper Networks for full interoperability within Juniper QFX and EX platforms.
What are common use cases for this DAC cable?
Ideal for server-to-switch, switch-to-switch or top-of-rack interconnects where short-reach, high-performance links are required.
How do I install the QFX-QSFP-DAC-3M?
Align the QSFP+ connectors with the port guides, slide until the latch clicks, and secure without additional tools or configuration.
Does the QFX-QSFP-DAC-3M require configuration?
No configuration is needed—the cable is plug-and-play and recognized automatically by compliant network equipment.
What warranty covers the QFX-QSFP-DAC-3M?
Juniper Networks provides a one-year limited warranty covering defects in materials and workmanship under normal use.
How can I check availability and order this cable?
Contact your authorized Juniper reseller or visit the Juniper Networks online store to verify stock and place an order.