652495-001 HPE 2-Port 361T 1GB Ethernet Adapter

Product Overview of HPE 652495-001 2-Ports Adapter

The HPE Ethernet 1Gb 2-Port 361t Adapter is a reliable and efficient network card designed to enhance connectivity in enterprise and server environments. With dual ports and advanced features, this low-profile PCI Express adapter ensures seamless data transmission and robust performance.

General Information

• Manufacturer: HPE
• Part Number: 652495-001
• Product Type: Network Adapter 

Technical Specifications

• Total Ports : 2 
• Form Factor : Plug-in Card - Low Profile
• Interface (bus) Type : PCI Express 2.0 X4
• Connectivity Technology : Wired
• Data Transfer Rate : 1 Gbps

Cabling Types Supported

• Ethernet 10Base-T
• Ethernet 100Base-TX
• Ethernet 1000Base-T

Data Link Protocols

• Ethernet
• Fast Ethernet
• Gigabit Ethernet

Advanced Features

• Auto-negotiation
• Wake On LAN (WoL)
• Network Fault Tolerance (NFT)
• Jumbo Frames Support
• PXE Boot Support
• Large Send Offload (LSO)
• Energy Efficient Ethernet

Compliance Standards

• IEEE 802.3
• IEEE 802.3u
• IEEE 802.1q
• IEEE 802.3ab
• IEEE 802.3x
• IEEE 802.3ad (LACP)
• IEEE 802.1as
• IEEE 802.3az

The HPE 652495-001 2-Port 1GB Adapter Card Overview

The HPE 652495-001 Ethernet 2-Port 361T 1Gb Plug-in Card represents a widely deployed enterprise-grade network interface solution engineered for stable, high-availability server networking environments. This network interface card (NIC) belongs to a class of low-profile PCI Express 2.0 x4 adapters that prioritize compatibility and stability over experimental high-throughput features. It is commonly deployed in data center infrastructures where deterministic performance, backward compatibility with existing Ethernet switches, and operational efficiency are critical design constraints. The 361T controller architecture provides balanced CPU offloading capabilities, enabling reduced processor overhead during packet handling and improved overall system responsiveness.

Enterprise Networking Architecture

The design philosophy behind the HPE 361T 1Gb Ethernet adapter focuses on maintaining a balance between throughput efficiency, hardware reliability, and energy-conscious operation. Unlike higher-bandwidth adapters that require significant infrastructure upgrades, this card integrates seamlessly into legacy and modern network environments that rely on 1GbE switching fabrics. Its architecture is optimized for predictable latency and stable packet delivery, which is essential in transactional workloads and virtual machine hosting environments. The engineering approach emphasizes hardware-assisted processing for TCP/IP offloading, checksum validation, and segmentation tasks. By delegating these operations to the NIC hardware, server CPUs are freed to focus on application-level workloads, improving overall system efficiency. This design is particularly beneficial in environments with high network I/O concurrency, such as web hosting clusters and distributed application servers.

Hardware Integration and Controller Efficiency

At the core of the adapter lies a highly optimized Ethernet controller capable of managing dual independent Gigabit Ethernet streams. Each port operates independently, allowing administrators to configure redundancy, link aggregation, or separate network segmentation strategies. The controller is engineered to maintain consistent throughput under varying packet sizes and network loads, ensuring minimal jitter and packet loss. The hardware integration also includes advanced buffering techniques that smooth out traffic bursts. This ensures that short-term spikes in network usage do not overwhelm the system bus or degrade performance. The controller’s firmware works in conjunction with the host system’s driver stack to provide adaptive flow control and efficient interrupt moderation.

PCI Express 2.0 x4 Interface

The PCI Express 2.0 x4 interface is a critical component of the adapter’s performance profile. Operating over four lanes, it provides sufficient bandwidth to fully support dual 1GbE ports without introducing bottlenecks under normal enterprise workloads. The PCIe 2.0 specification ensures compatibility with a wide range of server motherboards, including older enterprise systems that still dominate many production environments. The x4 lane configuration allows for balanced data flow between the NIC and system memory, reducing contention and improving packet processing efficiency. Even under simultaneous full-duplex traffic conditions across both ports, the interface maintains stable throughput without saturating the PCIe bus.

Latency Optimization Through Bus Efficiency

Latency management is a key consideration in server network adapter design. The PCIe interface of this card minimizes latency by enabling direct memory access (DMA) transfers between the NIC and system RAM. This eliminates unnecessary CPU intervention and reduces round-trip packet processing time. In virtualized environments, this efficiency translates into improved VM-to-VM communication performance and more predictable network response times, particularly when multiple virtual network interfaces are mapped to the physical adapter.

Dual-Port 1GbE RJ-45 Connectivity

The dual-port RJ-45 configuration provides flexibility in network design and deployment. Each port supports 10BASE-T, 100BASE-TX, and 1000BASE-T standards, ensuring backward compatibility with older networking infrastructure while maintaining full Gigabit performance when connected to modern switches. This dual-port architecture enables administrators to implement redundant network paths or segregate traffic types such as management traffic and application data traffic. The physical separation of ports enhances fault tolerance and allows for advanced network topologies in enterprise environments.

Link Aggregation and Redundancy Capabilities

When configured with appropriate operating system support, the dual ports can be bonded to create aggregated bandwidth channels. This improves throughput for applications that can utilize parallel network streams. Alternatively, active-backup configurations provide failover protection, ensuring continuous network availability in case of port or cable failure. Such flexibility makes the adapter suitable for mission-critical server environments where uptime is a primary requirement. The hardware is designed to support continuous operation under heavy network load without degradation in signal quality or throughput consistency.

Network Standards and Protocol Compliance

The HPE 361T adapter adheres to established IEEE Ethernet standards, ensuring interoperability across diverse networking ecosystems. Support for 10BASE-T, 100BASE-TX, and 1000BASE-T ensures seamless integration with switches and routers of varying generations. This backward compatibility is particularly valuable in enterprise environments with phased infrastructure upgrades. The adapter supports full-duplex communication across all speeds, enabling simultaneous transmit and receive operations without collisions. Auto-negotiation functionality ensures optimal link configuration between the NIC and connected network devices, reducing manual configuration overhead.

Signal Integrity and Transmission Reliability

Signal integrity is maintained through advanced encoding and error correction mechanisms embedded in the controller firmware. The RJ-45 interface is engineered to minimize crosstalk and electromagnetic interference, ensuring stable communication even in high-density server rack environments. This level of reliability is essential in environments where even minor packet loss can impact application performance, such as database clusters and financial transaction systems.

Performance Optimization and CPU Offloading Features

One of the defining characteristics of this Ethernet adapter is its ability to offload processing tasks from the host CPU. TCP segmentation offload (TSO), large receive offload (LRO), and checksum offloading are commonly supported features that reduce CPU utilization during high network traffic conditions. By handling these operations at the hardware level, the adapter allows server processors to allocate more resources to application execution rather than network stack processing. This improves overall system efficiency and reduces latency in compute-intensive environments.

Server Compatibility and Flexibility

The low-profile design of the HPE 652495-001 makes it suitable for a wide range of server chassis, including rack-mounted and blade server configurations. The compact form factor ensures compatibility with space-constrained environments while maintaining full functionality. This adapter is commonly deployed in HPE ProLiant server ecosystems, where firmware and driver support are optimized for seamless integration. Compatibility with multiple operating systems, including Linux distributions and Windows Server environments, enhances its versatility in heterogeneous IT infrastructures.

Low Profile Form Factor

The low-profile bracket design of the adapter is engineered for compact server systems where internal space is limited. Despite its reduced physical footprint, the card maintains robust thermal performance through optimized heat dissipation pathways. The PCB layout is designed to minimize signal interference and ensure consistent electrical performance across both ports. Component placement is optimized to reduce electromagnetic coupling and improve long-term durability under continuous operation.

High Availability Network Strategies

The adapter supports integration into high availability clusters where network redundancy is critical. Administrators can configure failover groups that automatically reroute traffic in the event of hardware or cable failure.

Security Features and Data Integrity Protection

Network security is supported through hardware-assisted validation mechanisms that ensure data integrity during transmission. While the adapter does not replace higher-level security protocols, it provides a stable and reliable transport layer that supports secure communication frameworks. Checksum offloading and packet validation help reduce the risk of corrupted data entering application layers, contributing to overall system reliability.