The PEX8518-AA25BES-G is a high-performance PCI Express (PCIe) switch from PLX Technology, now Broadcom. This switch is designed to provide connectivity solutions for various applications requiring PCIe expansion, enabling multiple devices to communicate efficiently over a single PCIe link. It’s a part of the ExpressLane™ PEX 8500 series, known for its low latency and high throughput.

Applications

• Servers
• Storage systems (e.g., RAID controllers, JBOD enclosures)
• Networking equipment (e.g., Ethernet adapters, Fibre Channel HBAs)
• Embedded systems requiring PCIe expansion
• Industrial PCs

Features

• 18-lane, 5-port PCI Express switch
• Compliant with PCI Express Base Specification, Revision 2.0
• Supports data rates up to 5 GT/s per lane
• Non-blocking architecture for high throughput
• Advanced error reporting and handling
• Hot-plug support
• Integrated clock buffer
• Low power consumption

Benefits

• Enables PCIe expansion, allowing more devices to be connected to a system.
• High throughput and low latency ensure efficient data transfer.
• Advanced error handling improves system reliability.
• Hot-plug support allows devices to be added or removed without shutting down the system.
• Reduces system cost and complexity by consolidating multiple PCIe connections.

Technical Specifications

The PEX8518-AA25BES-G supports 18 lanes that can be configured to provide various port configurations, such as 1x16 + 1x1, 1x8 + 2x4 + 1x2, etc. It operates at 2.5 GT/s or 5 GT/s per lane, conforming to PCIe Gen 1 and Gen 2 specifications. The switch integrates advanced features for traffic management, quality of service (QoS), and error handling. It is typically packaged in a BGA (Ball Grid Array) for surface mount assembly. Power consumption varies depending on the configuration and traffic load but is designed to be relatively low for its performance class. The operating temperature range is usually within industrial standards, suitable for various environments. Detailed specifications can be found in the PLX/Broadcom datasheet.