| NO. | Brand | Compatible P/N | Remarks |
| 1 | Cisco | QSFP-4SFP25-CU3M | |
| 2 | Arista Networks | CAB-Q28-S28-3M | |
| 3 | Brocade | 100G-Q28-S28-C-0301 | |
| 4 | Huawei | QSFP-4SFP25G-CU3M | |
| 5 | Juniper | QFX-Q-S-DAC-3M |
This 3-meter breakout DAC cable connects one 100G QSFP28 port to four 25G SFP28 ports. fully compatible with Juniper equipment and replaces Juniper QFX-Q-S-DAC-3M.
Designed for short distances, the passive copper breakout DAC cable requires zero power to operate, provides ultra-low latency, offering highly cost-effective alternative to expensive optical transceivers and fiber patch cords.
It offers cost-effective interconnect solution for data centers,seamlessly merges 100G switches with 25G host adapters, switches, and high-speed enterprise servers.
This compatible breakout cable is flashed with Juniper’s unique EEPROM attributes. It is fully recognized by Junos OS, allowing instant interface initialization without triggering "Non-Juniper optics" warnings or port locking.
QFX Series Data Center Switches: QFX5100-24Q, QFX5100-48S, QFX5110-32Q, QFX5200-32C (configured for 40G mode), QFX3500
EX Series Enterprise Switches: EX4300, EX4600, EX9200 (equipped with compatible 40G QSFP+ uplink or line modules)
MX Series Universal Routers: MX240, MX480, MX960 (via MIC/MPC line cards natively supporting 40G to 10G breakout configs)
Enterprise NICs: Broadly compatible with 10G SFP+ network adapters from Intel (X520, X710), Mellanox/NVIDIA (ConnectX-3/4 Lx 10G), and Broadcom installed in standard server architectures.
40G to 4x10G Port Splitting: Converting a high-density 40G QSFP+ switch port into four discrete 10G SFP+ ports to optimize port density.
ToR Leaf-to-Server Connectivity: Directly connecting a 40G Top-of-Rack (ToR) Juniper QFX switch to up to four downstream servers or storage systems equipped with 10G SFP+ NICs.
Legacy System Aggregation: Providing an efficient migration path to link older 10G infrastructure directly to modern 40G network cores within the same rack space.
Cost-Minimized Intra-Rack Patching: Serving as an eco-friendly 3-meter interconnect that eliminates extra cooling loads and active optical costs.
| Juniper Compatible | QFX-Q-S-DAC-3M | Vendor Name | HYTOPTODEVICE |
| Connector | QSFP28 to 4xSFP28 | Max Data Rate | 100Gbps |
| Cable Length | 3m (10ft) | AWG | AWG 28 |
| Jacket Material | PVC(OFNR) | Minimum Bend Radius | 25mm |
| Operation Temperature | 0~ 70 °C (32 to 158°F) | Protocols | 100 Gigabit Ethernet |
Q1: What makes the "QFX-Q-S-DAC-3M" different from a standard 100G DAC cable? A1: The QFX-Q-S-DAC-3M is a breakout cable. it features a 100G QSFP28 connector on one end. the other end is four 25G SFP28 connector.
Q2: Can I use this DAC cable to connect a Juniper switch to a switch from another brand? A2: Yes, but you need a "dual-compatible" version where one end is coded for Juniper and the other end is coded for the other brand (e.g., Cisco, Dell, or HPE).
Q3:Is the QFX-Q-S-DAC-3M an active or passive cable? A: No, it's a passive breakout cable. It contains no active signal amplification circuitry, boasts extremely high reliability, excellent power consumption (almost 0W), and outstanding latency.
Q4: What is the maximum distance for the QFX-Q-S-DAC-3M? A4: Its maximum physical length is 3 meter (10 feet).it transports data with a passive copper twinax cable.
Q5:Can I use this Juniper-coded DAC cable to connect a Juniper switch to a Arista or Cisco switch?A5:If you use a standard Juniper-coded cable, the Arista/Cisco end might reject it due to vendor locking. For cross-vendor environments, it is highly recommended to order a Dual-Vendor Coded Cable (Juniper-coded on End A, and Arista/Cisco-coded on End B) to ensure seamless plug-and-play compatibility on both sides.
Q6: Can the four SFP28 ends be connected to switches from different vendors? A6: Yes, but it requires customized multi-vendor programming. For example, we can program the 100G end for a Huawei switch and the four 25G ends for Cisco or Dell server NICs. Please specify your requirements when ordering.
Q7:Will Juniper EOS recognize this cable as genuine? A7: Yes. Our compatible breakout cables are flashed with the authentic Juniper vendor profile. The switch will recognize it as a QFX-Q-S-DAC-3M.
Q8:Can I use this DAC cable to break out a 40G port into four 10G ports? A: No. This cable is specifically tuned and coded for 100G-to-4x25G applications. For 40G-to-10G setups, you must use a dedicated 40G breakout cable.
Q9: Will Juniper switches display a third-party warning flag with this cable? A9: No. Our compatible breakout cable is flashed with exact Juniper vendor cryptographic signatures. The operating system will read it as an original Juniper QFX-Q-S-DAC-3M, ensuring clean port initialization.
Q10: What happens if I only plug in two or three of the 25G SFP28 ends? A10: The connected legs will work perfectly fine. The channels operate independently. The unused SFP28 ends can be left disconnected without affecting the traffic on the active legs.
HYTOPTODEVICE has supplied over 200,000 passive Direct Attach Copper(DAC) cable to data centers and enterprise networks across 100+ countries since 2011. Every passive DAC cable undergoes comprehensive 100% performance, signal integrity, and compatibility testing before shipment。
"We replaced 100 Cisco-branded DACS with HYTOPTODEVICE equivalents across our spine layer — zero compatibility issues, 40% cost reduction."— Network Architect, Tier-2 ISP, England
Quality Certification & Compliance：
At HYTOPTODEVICE, our quality commitment is backed by industry-standard validations. From passive DAC cable manufacturing to final inspection, our processes ensure global compliance and reliability.
We adhere to rigorous standards for our passive DAC cable 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.
