40G QSFP+ to QSFP+ Direct Attach Copper Cable 28AWG Passive 7M QDR
The 40G QSFP+ to QSFP+ passive DAC cable (7M, 28AWG) provides a reliable, low-latency solution for short-distance 40Gbps links. Its plug-and-play design and flexible construction make it ideal for high-density data center interconnects.
-
Description
-
Specification
-
Features
-
Application
-
Custom Service
-
FAQ
The 40G QSFP+ to QSFP+ Passive Direct Attach Copper (DAC) Cable is a high-performance twinax interconnect designed for short-reach 40Gbps networking applications. It provides a direct electrical connection between QSFP+ ports, eliminating the need for optical transceivers and delivering a cost-efficient, low-latency solution for data center interconnects.
Built with 28AWG high-quality copper conductors, this QDR (Quad Data Rate) DAC cable ensures stable signal integrity and reliable performance across short-distance links. It is widely used in high-density switch-to-switch and switch-to-server environments where efficient 40G connectivity is required.
Featured DAC & AOC Cable Solutions
| SKU | Cable Type | Data Rate | Form Factor A | Form Factor B | Wire Type | Length |
| AOC-100GQSFP28-5 | AOC | 100G | QSFP28 | QSFP28 | OM4 Fiber Cable | 5M |
| AOC-10GSFP-10 | AOC | 10G | SFP+ | SFP+ | OM4 Fiber Cable | 10M |
| AOC-25GSFP28-3 | AOC | 25G | SFP28 | SFP28 | OM4 Fiber Cable | 3M |
| AOC-40GQSFP-10 | AOC | 40G | QSFP+ | QSFP+ | OM3 Fiber Cable | 10M |
| AOC-QSFP-10G4SFP-5 | AOC | 40G | QSFP+ | 4*SFP+ | OM3 Fiber Cable | 5M |
| AOC-QSFP28-4SFP28-3 | AOC | 100G | QSFP28 | 4×SFP28 | OM3 Fiber Cable | 3M |
| DAC-100GQSFP28-25G4SFP28-P5 | DAC | 100G | QSFP28 | 4×SFP28 | 24AWG | 5M |
| DAC-100GQSFP28-P3 | DAC | 100G | QSFP28 | QSFP28 | 26AWG | 3M |
| DAC-10GCX4-P05 | DAC | 10G | CX4 | CX4 | 28AWG | 3M |
| DAC-10GSFP-P10 | DAC | 10G | SFP+ | SFP+ | 24AWG | 10M |
| DAC-10GSFP-XFP-A10 | DAC | 10G | SFP+ | XFP | 24AWG | 10M |
| DAC-400GQSFP-P5 | DAC | 400G | QSFP-DD | QSFP-DD | 30AWG | 5M |
| DAC-40GQSFP-P07 | DAC | 40G | QSFP+ | QSFP+ | 28AWG | 7M |
| DAC-QSFP-10G4SFP-P03 | DAC | 40G | QSFP+ | 4 * SFP+ | 30AWG | 3M |
| DAC-SFP-P05 | DAC | 1.25G | SFP | SFP | 30AWG | 5M |
| Connector | QSFP+ to QSFP+ |
|---|---|
| Data Rate | 40Gbps (QDR) |
| Cable Type | Twinax Copper DAC |
| Wire Gauge | 28AWG |
| Length | 7 Meter |
| Power Requirement | None (Passive) |
| Latency | Near-zero |
| Shielding | High-performance EMI shielding |
| Hot-Pluggable | Yes |
| Operating Temperature | 0°C to +70°C |
| Compliance | SFF-8436 / SFF-8679 | RoHS |
- QSFP+ to QSFP+ connectivity at 40Gbps
- Passive Direct Attach Copper (DAC) for cost-effective short-range links
- 28AWG cable construction for low signal attenuation
- 7-meter length suitable for top-of-rack or adjacent rack connections
- QDR (Quad Data Rate) performance for high-speed applications
- Plug-and-play design with no additional power or modules required
- Compact and flexible design for high-density installations
- Data center switch-to-switch or server-to-switch interconnects
- High-performance computing (HPC) clusters
- Top-of-Rack (ToR) network connections
- Storage area network (SAN) environments
- Short-distance 40Gbps Ethernet links
FiberMania provides OEM and ODM services for QSFP+ DAC cables. Custom options include cable length, wire gauge, connector plating, and private labeling. We support bulk production and tailored solutions to meet diverse network infrastructure requirements.
Customize DAC & AOC High-Speed Cable Solution
| Cable Type | Passive DAC / Active DAC (ACC) / Active Optical Cable (AOC) |
| Form Factor | SFP+ / SFP28 / QSFP+ / QSFP28 / QSFP56 / QSFP-DD / OSFP |
| Data Rate | 10G / 25G / 40G / 50G / 100G / 200G / 400G / 800G |
| Cable Length | 0.5m–15m (DAC) / 1m–100m (AOC) |
| Transmission Medium | Twinax Copper / Multimode Optical Fiber |
| Connector Compatibility | Cisco / NVIDIA / Arista / Juniper / Dell / HPE / Generic Compatible |
| Jacket Type | PVC / LSZH |
| EEPROM Coding | OEM Compatible Programming Available |
| Operating Temperature | Commercial / Industrial Grade |
Q1: What is a DAC cable?
A: A Direct Attach Copper cable is a fixed copper assembly with integrated connectors used for short-distance high-speed data connections.
Q2: What does 28AWG mean?
A: It refers to the cable thickness, where 28 American Wire Gauge provides a balance between flexibility and signal integrity for 40Gbps links.
Q3: Is this cable active or passive?
A: This is a passive DAC cable, which does not include signal amplification and relies on short-distance copper transmission.
Q4: What does QDR stand for?
A: QDR means Quad Data Rate, supporting 40Gbps speeds across four lanes of 10Gbps each.
Q5: Can this cable be used in high-density racks?
A: Yes, its compact and flexible design is suitable for top-of-rack and adjacent rack connections.
Related products
- DAC-25GSFP28-01
25G SFP28 DAC Passive Direct Attach Copper Cable, 1m–5m
- DAC-40GQSFP-P10
40G QSFP+ to QSFP+ Direct Attach Copper Cable 24AWG Passive 10M QDR
- DAC-QSFP-10G4SFP-P10
40G QSFP+ to 4×10G SFP+ Direct Attach Breakout Cable 30AWG Passive 10m
- DAC-40GQSFP-A15
40G QSFP+ to QSFP+ Active Direct Attach Copper Cable 24AWG 15M QDR
- DAC-QSFP-10G4SFP-P03
40G-CR4 QSFP+ to 4 10G-CU SFP+ Direct Attach Breakout Copper Cable 30AWG Passive 3M

















