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.

SKU DAC-40GQSFP-P07 Category
Share this product with

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
ConnectorQSFP+ to QSFP+
Data Rate40Gbps (QDR)
Cable TypeTwinax Copper DAC
Wire Gauge28AWG
Length7 Meter
Power RequirementNone (Passive)
LatencyNear-zero
ShieldingHigh-performance EMI shielding
Hot-PluggableYes
Operating Temperature0°C to +70°C
ComplianceSFF-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.