HPE 844477-B21

Overview

The HPE 844477-B21 is a 3-meter direct attach copper cable designed to connect devices with SFP28 ports at 25 Gigabit speeds. It provides a reliable and cost-effective solution for short-range connections within racks or between adjacent racks, supporting high-bandwidth data transfer without the need for additional transceivers or fiber optics. With a low signal delay of approximately 4.5 nanoseconds per meter and an impedance of 110 ohms, it ensures stable performance in demanding data center environments.

Key features

• Direct attach copper cable that delivers 25 Gbps connectivity for fast data transfer.
• Three meter length ideal for linking servers, switches, or storage devices within or between racks.
• Compatible with a range of HPE equipment including SN2410 switches, Primera storage arrays, and StoreOnce backup systems.
• Maintains signal integrity with 110 ohm impedance, reducing errors and improving reliability.
• Low latency with signal delay around 4.5 nanoseconds per meter, supporting latency-sensitive applications.
• Compact 4.5 mm diameter and 23 mm bend radius allow easy routing through cable management systems and tight spaces.
• Eliminates the need for transceivers, lowering both cost and power consumption.
• Operates reliably within typical data center temperature ranges from 32 °F to 158 °F.

Key specs

• Data rate: 25 Gbps
• Cable length: 3 meters (approximately 10 feet)
• Impedance: 110 ohms
• Signal delay: ~4.5 nanoseconds per meter
• Cable diameter: 4.5 mm
• Bend radius: 23 mm (single bend)
• Operating temperature: 32 °F to 158 °F
• Connector type: SFP28 to SFP28

Connectivity and compatibility

This cable is designed to plug directly into any HPE device equipped with SFP28 cages, making it a seamless choice for expanding or upgrading existing 25 Gigabit networks. It works well with HPE SN2410 top of rack switches, Primera storage arrays, and StoreOnce backup systems, ensuring broad compatibility within HPE data center environments. The direct attach design simplifies installation by removing the need for separate transceivers.

Installation and setup

Installation is straightforward thanks to the cable’s flexible design and manageable length. The 4.5 mm diameter and 23 mm bend radius allow it to be routed cleanly through cable trays and around corners without risking damage. Its 3-meter length is well suited for connecting devices within the same rack or between adjacent racks, making it a practical choice for data center layouts that require short, high-speed links.

Ideal uses and environments

This cable fits well in data centers that require efficient 25 Gigabit connections for servers, switches, and storage systems. It supports environments where low latency and stable signal integrity are critical, such as virtualization clusters, high-performance computing, and real-time analytics. Its temperature rating aligns with typical hot and cold aisle conditions, making it reliable for standard data center deployments. It is a strong option for IT teams looking to upgrade from 10 Gigabit links to higher bandwidth without increasing power consumption or complexity.

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