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Reliable 40G passive cable for rack-to-rack use.
QSFP-H40G-CU5M=
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5M 40GBASE-CR4 PASSIVE COPPER CABLE
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Name:
QSFP-H40G-CU5M=
- Description:
- 5M 40GBASE-CR4 PASSIVE COPPER CABLE
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 824197260845
- Condition:
- Warranty:
- 3
- List Price:
$130.00
- Price:
$83.0036.2% off
Quantity:
1
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QSFP-H40G-CU5M= Overview
QSFP-H40G-CU5M= is a QSFP transceiver cable assembly engineered for high-speed 40G Ethernet connectivity across short-range deployments. It integrates the QSFP form factor with a built-in fixed copper cable design to support 40G data rates, offering reliable performance for data centers, enterprise networks, and telecom applications.
This cable is designed to provide low latency and robust interconnectivity between switches, servers, and routers, ensuring seamless performance in high-density network environments. With a transmission reach of up to 5 meters, QSFP-H40G-CU5M= is optimized for rack-to-rack or device-to-device links, making it a preferred solution for critical network infrastructures that demand energy efficiency and consistent connectivity.
QSFP-H40G-CU5M= price is $83.00, a 36.2% saving from the Cisco list price of $130.00. QSFP-H40G-CU5M= is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for QSFP-H40G-CU5M= for additional pricing. Browse the full 40G Base Modules series or explore all Cisco products.
QSFP-H40G-CU5M= Specifications
- Power Consumption
- N/A
- Weight
- N/A
- Height
- N/A
- Depth
- N/A
- Width
- N/A
- Product Type
- Transceiver
- Transmission Distance
- Short-Range
- Supported Protocols
- Ethernet
- Operating Temperature
- 0 to 70°C
- Storage Temperature
- -40 to 85°C
- Compatibility
- N/A
- Network Interface
- Ethernet
- Form Factor
- QSFP
- Data Rate
- 40G
- Connector Type
- QSFP
- Wavelength
- N/A
- Fiber Type
- N/A
- Max Distance
- 5m
- Input Voltage
- N/A
- Product Name
- QSFP-H40G-CU5M=
QSFP-H40G-CU5M= Use Case
Top-of-Rack to Aggregation Switch Interconnect in Hyperscale Data Centers
In high-density hyperscale data centers, deploy the QSFP-H40G-CU5M=-5M 40GBASE-CR4 passive copper cable to connect top-of-rack switches to aggregation switches within a 5 m span. This solution delivers full 40 Gbps throughput with ultra-low latency and zero signal loss, while reducing power consumption by up to 70% versus active optics. Outcome: streamlined rack deployments, lower total cost of ownership, and maximized port density for cloud-scale environments.
GPU-to-GPU High-Performance Compute Cluster Connectivity
AI/ML and HPC clusters require deterministic high-bandwidth links between GPU servers. Using the QSFP-H40G-CU5M=-5M 40GBASE-CR4 passive copper cable to cross-connect adjacent GPU nodes ensures consistent 40 Gbps data rates, sub-microsecond latency, and error-free transmission. Benefit: accelerates deep learning training and inference workloads by up to 15%, maintains thermal and power budgets, and simplifies cabling in dense compute racks.
SAN Fabric Uplink for Real-Time Enterprise Storage Replication
Mission-critical storage fabrics demand reliable, high-throughput links for synchronous data replication. Integrating the QSFP-H40G-CU5M=-5M 40GBASE-CR4 passive copper cable between SAN switches provides stable 40 Gbps performance with minimal latency and interference. Outcome: faster data mirroring, improved disaster recovery RPO/RTO, and optimized capital expenditure through a cost-effective, maintenance-free passive interconnect.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
| QSFP-H40G-CU5M= |  QSFP-H40G-AOC7M= |  CVR-4SFP10G-QSFP= |  QSFP-40G-SR4-S |  QSFP-40G-ER4= | |
|---|---|---|---|---|---|
| Product Type | Transceiver | Transceiver | Transceiver | Transceiver | Transceiver |
| Form Factor | QSFP | QSFP | QSFP+ | QSFP | QSFP |
| Data Rate | 40G | 40G | 10G | 40G | 40G |
| Connector Type | QSFP | MPO | LC | MPO | LC Duplex |
| Wavelength | N/A | N/A | 850 nm | 850 nm | 1310 nm |
| Transmission Distance | Short-Range | Short-Range | Short-Range | Short-Range | Extended-Range |
| Fiber Type | N/A | N/A | Multi-mode | Multi-mode | Single-mode |
| Max Distance | 5m | 7m | 300 meters | 100 meters | 40 km |
| Supported Protocols | Ethernet | Ethernet | Ethernet | Ethernet | Ethernet |
| Network Interface | Ethernet | Ethernet | Fiber | Ethernet | Fiber |
| Power Consumption | N/A | N/A | 3.5 W | 4 W | 3.5W |
| Operating Temperature | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C | 0 to 70°C |
| Storage Temperature | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C | -40 to 85°C |
| Input Voltage | N/A | 3.3V | 3.3V | 3.3V | 3.3V |
| Compatibility | N/A | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista | Cisco / Juniper / Huawei / Arista | Cisco, Juniper, Huawei, Arista |
| Product Name | QSFP-H40G-CU5M= | QSFP-H40G-AOC7M= | CVR-4SFP10G-QSFP= | QSFP-40G-SR4-S | QSFP-40G-ER4= |
| Height | N/A | N/A | 0.7 inches | N/A | 0.55 inches |
| Width | N/A | N/A | 2.2 inches | N/A | 0.55 inches |
| Depth | N/A | N/A | 3.7 inches | N/A | 1.65 inches |
| Weight | N/A | N/A | 0.3 lbs | N/A | 0.2 lbs |
Reviews & Ratings
K
Kevin Turner
5
Consistent performance with no issues.
B
Brian Clark
5
Good cable quality and easy deployment.
J
Jason Mitchell
5
Stable connectivity in daily operations.
M
Mark Scott
5
Meets enterprise expectations.
Questions & Answers
What is the Cisco QSFP-H40G-CU5M= cable?
The QSFP-H40G-CU5M= is a 5-meter, 40GBASE-CR4 passive copper direct-attach cable designed for high-density, short-reach interconnects in data centers.
What are the key specifications of the QSFP-H40G-CU5M=?
It supports 40 Gbps aggregate bandwidth over four lanes at 10 Gbps each, has a fixed length of 5 meters, operates between 0 °C and 70 °C, and meets the QSFP MSA specification.
Is the QSFP-H40G-CU5M= cable MSA compliant?
Yes, the cable is fully compliant with the QSFP Multi-Source Agreement (MSA) for interoperability across vendors.
Which switches and adapters are compatible with QSFP-H40G-CU5M=?
This cable is compatible with any QSFP+ or QSFP28 port supporting 40GBASE-CR4, including Cisco Nexus, Catalyst, and third-party switches and network adapters.
What applications is this passive copper cable best suited for?
It is ideal for server-to-switch, switch-to-switch, and switch-to-storage connectivity in top-of-rack, end-of-row, and middle-of-row data-center deployments.
Does QSFP-H40G-CU5M= support 40 Gbps data rates?
Yes, the cable delivers full 40 Gbps aggregate bandwidth (4×10 Gbps) over copper without signal loss or protocol conversion.
What is the maximum cable length for reliable 40GBASE-CR4 performance?
This passive copper assembly is specified for lengths up to 7 meters; the QSFP-H40G-CU5M= is optimized for a fixed 5-meter span.
Does a passive copper cable consume power?
No, passive copper cables draw no additional power beyond the transceiver ports, reducing overall system power consumption.
How does passive copper differ from active copper cables?
Passive copper uses no signal amplification, offering lower power usage and latency, while active copper integrates signal conditioners to support longer reaches.
Do I need transceiver modules with the QSFP-H40G-CU5M=?
No additional transceivers are required; the cable terminates in QSFP+ connectors that plug directly into QSFP+ ports.
Is the QSFP-H40G-CU5M= hot-pluggable?
Yes, you can insert or remove the cable while the system is powered on without disrupting the overall network operation.
What is the operating temperature range for this cable?
The cable is rated for an operating range of 0 °C to 70 °C (32 °F to 158 °F).
How do I install the QSFP-H40G-CU5M= in my switch or server?
Align and gently insert each QSFP+ connector into the device port until the latch clicks; no tools or configuration changes are required.
What are the main benefits of using a passive copper DAC?
Passive DACs deliver low latency, low power consumption, and cost-effective short-reach connectivity in high-density environments.
What warranty covers the QSFP-H40G-CU5M=?
Cisco provides a lifetime warranty for manufacturing defects when used in authorized Cisco systems.
How can I troubleshoot link issues with this cable?
Verify port compatibility, inspect connectors for damage, test continuity with a loopback adapter, and check switch port diagnostics for error counters.