Cisco QDD-400-CU2.5M Copper Cable
If you need a large quantity of QDD-400-CU2.5M product - call us at +1 (718) 766 5269 or request a quote at live chat and our sales manager will contact you shortly.
Looking for assistance? Connect with one of our experts
FREE Shipping. We are accepting NET 30 Days Purchase Orders. Get a decision in seconds, without affecting your credit.
1 of 9

Cisco QDD-400-CU2.5M QSFP Passive Copper Cable 2.5M Bulk Bulk

Availability: In Stock
Part Number#: QDD-400-CU2.5M
List Price was: $544.19
Your Price:
You Save: $310.19 (57% off)

3% Discount on Checkout

New Bulk Pack

Short Description:
QDD-400-CU2.5M Quad Small Form-Factor Pluggable (QSFP) Passive Copper Cable 2.5M | Made by Cisco | New Bulk Pack
Product Condition:
New Bulk Pack
Warranty provided by ALLHDD.COM:
90 Days

Features and Specifications of 2.5 Meter Copper Cable

The Cisco QDD-400-CU2.5M QSFP Passive 2.5M Copper Cable is a high-speed networking cable that is designed to connect network switches, routers, and other networking devices. It is a direct attach copper (DAC) cable that supports 40 Gigabit Ethernet (GbE) data transfer speeds, making it ideal for high-bandwidth applications such as data centers, server farms, and cloud computing environments.

Some of the key features and specifications of the Cisco QDD-400-CU2.5M QSFP Passive 2.5M Copper Cable include:

  • Cable length: The cable is 2.5 meters (8.2 feet) long, which is suitable for connecting devices in close proximity.
  • Connector type: The cable features QSFP connectors on both ends, which are compatible with QSFP ports on Cisco networking devices and other brands of networking equipment that support QSFP interfaces.
  • Data transfer speed: The cable supports data transfer speeds of up to 40 GbE, which is sufficient for high-bandwidth applications.
  • Cable type: The cable is a passive copper cable, which means that it does not require any power to operate.
  • Temperature range: The cable is designed to operate in a wide temperature range, from 0°C to 70°C, which makes it suitable for use in a variety of environments.
  • Compatibility: The cable is compatible with a wide range of Cisco networking devices, including Cisco Nexus switches, Cisco Catalyst switches, and Cisco ASR routers.

Working Principle of QSFP Cable

The Cisco QDD-400-CU2.5M QSFP Passive 2.5M Copper Cable is a high-speed cable designed to provide reliable connectivity between switches, routers, servers, and storage devices. It is designed to work with QSFP ports, which are commonly found in data centers and high-performance computing environments.

The cable is made up of four high-speed copper pairs, each capable of carrying data at speeds of up to 10 Gbps. These copper pairs are twisted together to minimize crosstalk and interference, which helps to ensure reliable data transmission.

The working principle of the Cisco QDD-400-CU2.5M QSFP Passive 2.5M Copper Cable is relatively simple. When connected to a QSFP port on a switch or other networking device, the cable establishes a physical link between the two devices. Data is then transmitted through the cable using a variety of protocols, depending on the specific networking application.

One key advantage of the Cisco QDD-400-CU2.5M QSFP Passive 2.5M Copper Cable is its passive design. Unlike active cables, which require power to transmit data, passive cables use no power and simply rely on the physical properties of the cable itself to transmit data. This makes the cable simpler and less expensive to manufacture, while also reducing the risk of failure due to power issues.

Benefits of Passive Copper Cable

The Cisco QDD-400-CU2.5M QSFP Passive 2.5M Copper Cable is a high-speed networking cable that provides several benefits to users. Here are some of the benefits of using this cable:

  • High speed connectivity: The Cisco QDD-400-CU2.5M cable provides a high-speed connectivity solution with a data transfer rate of up to 40 Gbps. This makes it an ideal cable for high-bandwidth applications such as data centers, cloud computing, and video streaming.
  • Passive design: This cable has a passive design, which means that it does not require any power source or active components. This makes it easy to install and use, and also reduces the overall power consumption of the system.
  • Copper construction: The cable is made of copper, which is a highly conductive material that provides superior signal quality and reduces signal loss. Copper cables are also more affordable than optical cables, making them a cost-effective solution for high-speed connectivity.
  • QSFP+ form factor: The cable is designed to support the QSFP+ form factor, which is a compact and versatile interface that can support multiple data rates and protocols. This makes the cable compatible with a wide range of devices and networking equipment.
  • Length: The cable is 2.5 meters in length, which provides sufficient distance for connecting devices in close proximity to each other. Longer cables can be used with the help of compatible extender modules.

General Information about this Cisco QDD-400-CU2.5M

About New Bulk Pack Products

New Bulk Pack products come with clamshell boxes and do not have any manufacturer warranty. Many times manufacturers disassemble whole units to use parts or pulled from a new system. Typically, this product doesn't come with software or instructions unless indicated and no Manufacturer’s genuine warranty. You can take note these are not brand new products.

Cables - Copper Cable

Coper cables still remain the most popular option in high voltage and low voltage applications such as networking. Despite the disadvantages, such as electromagnetic interference, copper still offers a cost-effective solution for many applications.

How does Copper Cable Transmit Data?

It is a simple process that starts by energizing one side of a copper wire to set electrons in it in motion. The electrons travel to the other end of the wire with the signal information. Since movement is involved, you can expect the electrons to lose their energy and eventually stop moving if the cable is very long. The loss of electron energy leads to a reduction in signal strength. When the electrons stop moving before reaching the other end of the copper wire, a total signal loss occurs. In long-distance data transmission, boosters are placed at an appropriate location to re-energize the electrons. That is usually not a problem of concern when wiring your server because of the short distance involved.

Does Length of Copper Cables Matter?

Yes, it does. As already mentioned, there is a degradation of signals as they move through the copper conductor due to losses. Copper wires have an internal resistance that will oppose the movement of current through them. Data moves through these copper cables as a stream of or pulses of current. The longer the wire, the higher the resistance and more likely signal strength deterioration. Think of it as walking uphill. The further you go, the more tired you become, and you may eventually stop moving.

When you are shopping for copper cables, just make sure you get an appropriate wire length for the application. Do not use a 10-meter cable where you can use a 5-meter cable. You make your system more efficient by using the best cable for the application.

Copper Cables for Every Application

You might have been made to believe that all copper cables are the same. That is not true. Manufacturers of these cables do so with specific applications in mind. A different approach is followed for applications where data rate and bandwidth are a priority. That is why you will find InfiniBand copper cables intended for such applications. Also, the connectors at the end of the copper wires show the intended use. You will find a big difference in the connectors used by IBM's RIO-2 copper cable and HP's X240 direct attach cable.

When you are shopping for a copper cable, know what you intend to use it for. If you are not sure, consult with the sales representatives for any help. At ALLHDD, we have a technical team to help you solve any mystery in cable selection. Just contact us for the support you are entitled to get. We will help you to choose the best products and deliver them on time.

Please choose your location for calculate shipping cost.


ALLHDD guarantees that the products will not have defects in material that will affect the product's functionality during the Standard Warranty Period. The warranty period starts when the merchandise/items from our warehouse.

What does ALLHDD.Com warranty cover?

30-days to 3 years warranty:

Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

What is not covered by our warranty?

The reason why our warranty does not cover any problem caused by the following conditions:

(a) misuse of hardware; accidental damage; carelessness product(s) damage; shock; temperature beyond the specification of any product; faulty installation; operation; modification of goods;

(b) any misuse outside the instructions in the user manual for any specific product;

(c) damaged caused by other hardware or equipment. The warranty will void if the item is returned with physical damage, damage to the retail box, removed from the box, counterfeit labels/labelled by them, or any modifications of internal and external covers. Data loss or damages to any other equipment we do not cover by our offered warranty.

What is the Manufacturer/Brand Warranty?

In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).

For the server parts (i.e., Dell, HPE) to get Full coverage of the warranty server must have a full 3- 5 years warranty. However, ALLHDD.COM will cover the warranty duration if any Manufacturer doesn't support the advertised warranty and there is no refund for those.
Final Sale items are non-returnable/refundable in any situation. Any question? please ask our team before the shipment.

Important notes:

We can provide additional warranty service/support for any product you purchase from us if you need additional warranty coverage before finalizing the order from ALLHDD.Com. You need to ask in live chat/help or call us for more information.

Individual product warranty mentioned on each item product description page/detail page.

Free Technical support on purchased items, our expert consultancy over the phone, by email, by live chat, or by remote login.


Shipping Options and Estimated Delivery Time

UPS Shipping Options:

FREE UPS® Ground (Free shipping to all orders for 48 states!)
Estimated delivery time: 4-7 business days

UPS 3 Day Select®
Estimated delivery time: 3 business days

UPS 2nd Day Air®
Estimated delivery time: 1-2 business days, Delivery by 10:30 AM or 2:00 PM

UPS Next Day Air® Standard Overnight
Estimated delivery time: Overnight 2-5 PM, Standard Overnight Delivery.

UPS Next Day Air® - Priority Overnight
Estimated delivery time: Overnight Delivery (Next Business Day) Delivery by 10:30 AM or 12:00 PM

UPS Next Day Air® First Overnight - Early A.M
Estimated delivery time: Overnight 8:00 AM, Early morning, overnight delivery for your time-critical shipments.

UPS® First Overnight - Saturday
Estimated delivery time: Overnight 8:30 AM – Saturday

FedEx Shipping Options:

FedEx Ground®
Estimated delivery time: (4–7 business days in the contiguous 48 states)
*For residential delivery via FedEx Ground use FedEx Home Delivery®
Estimated delivery time: 4−7 business days, based on the distance to the destination.

FedEx Express Saver®
Estimated delivery time: 3 business days (by 4:30 PM to U.S. businesses; by 8:00 PM to residences)
Available throughout all 50 states (except Hawaii and Alaska)

FedEx 2Day®
Estimated delivery time: 2 business days (by 4:30 PM to U.S. businesses; by 8:00 PM to residences)
Available throughout all 50 states

FedEx Standard Overnight®
Estimated delivery time: Next-business-day (by 4:30 PM to U.S. businesses and by 8:00 PM to residences)
Available throughout all 50 states (Hawaii is outbound only)

FedEx Priority Overnight®
Estimated delivery time: Next-business-day (by 10:30 PM to U.S. businesses, noon to most residences)
Available throughout all 50 states

FedEx First Overnight®
Estimated delivery time: Next-business-day (by 8:30 or 9 AM to most areas)
Available throughout all 50 states

Worldwide Shipping Options:

UPS®/FedEx® International Economy

Estimated delivery time: 4-7 business days

UPS®/FedEx® International Priority

Estimated delivery time: 2-4 business days

UPS®/FedEx® Ground Shipping Canada

Estimated delivery time: 5-8 business days

Important notes:

  • The processing of orders with Ground Shipping can take up to 24-48 hours. But we try to process all orders the same day.
  • We are not responsible for weather problems that may affect the delivery of goods by carriers. We cannot guarantee the exact delivery time, regardless of the carriers' claims.
  • If you have any specific delivery time requirements, please contact our customer support and someone from our customer service team will be able to help you.
  • You can estimate the shipping cost from the products detail page, also available on the checkout page
  • The shipping cost depends on box dimensions, weight, and zip/postal code
  • To get a FedEx® delivery service you need to mention it on the checkout page notebox.
  • For urgent shipments, please contact our customer service.
  • Shipping cut off 4:00 PM (Monday-Friday) and available blind drop shipment.