Mbps operation is different for the two bit-rates. For 4 Mbps operation, the encoding is straightforward. One of the data-signal shunt pairs (Data_A) carries the Differential Manchester encoded bit stream, whereas there is no signal on the other pair (Data_B). The clock shunt pair carries a synchronous clock which is used to sample the Data_A signal. Therefore, the maximum baud rate on the data pair for the 4 Mbps operation is 8 Mbaud and the clock frequency is 8 MHz. An example of the encoding scheme for 4 Mbps operation is shown in Figure 82.

Figure 82. 8260 Backplane Signalling for 4 Mbps Operation

In 16 Mbps operation, using the same encoding technique as the 4 Mbps operation would result in a clock frequency of 32 MHz allowing little margin for timing or skew. Therefore, a different encoding scheme is used to reduce the baud rate and thus enhance the integrity of the signal on the 8260 backplane. For 16 Mbps operation, one of the data-signal shunt pairs (Data_A) carries the first half-bit of the Differential Manchester encoded data, while the other data signal (Data_B) carries the second half-bit and the clock signal, which is used to sample both data pairs. This encoding scheme results in a maximum data baud rate of 16 Mbaud and a clock rate of 16 MHz. An example of the encoding scheme used for 16 Mbps ring operation on the 8260 backplane is shown in Figure 83 on page 137.

136 8260 Multiprotocol Intelligent Switching Hub

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IBM 8260 manual Backplane Signalling for 4 Mbps Operation

8260 specifications

The IBM 8260 is a significant entry in the realm of enterprise servers, recognized for its performance, scalability, and robust features designed to cater to demanding business environments. It primarily serves as a high-capacity server for large organizations, capable of handling extensive workloads and complex applications without compromising speed or efficiency.

One of the standout features of the IBM 8260 is its powerful processing capabilities. It typically comes equipped with multiple processor units based on the IBM POWER architecture, which is renowned for its high-performance computing. This architecture allows the server to execute numerous simultaneous tasks, making it ideal for environments that require multitasking and high throughput.

Memory capacity is another key characteristic of the IBM 8260. Depending on the specific configuration, it can support substantial amounts of RAM, ensuring that applications can run effectively without the bottlenecks often associated with data-intensive tasks. This is crucial for enterprises that rely on real-time data analytics, large database management, and resource-heavy applications.

In terms of storage, the IBM 8260 offers flexible options. It supports a variety of storage solutions, including solid-state drives (SSDs) and traditional hard drives, catering to different performance and capacity needs. This scalability in storage helps organizations manage their data effectively while ensuring quick access and retrieval times.

Connectivity is also a prominent feature of the IBM 8260. The server includes advanced networking capabilities, supporting various protocols and technologies that facilitate fast data transfer and communication between devices. This enhances overall network performance, essential for businesses that depend on cloud computing and distributed computing environments.

Additionally, the IBM 8260 is designed with a focus on reliability and availability. It incorporates redundant components, such as power supplies and cooling systems, minimizing the risk of downtime. This is critically important for enterprises that require continuous availability of services.

The server’s management features are also noteworthy. IBM provides a suite of management tools that allow IT administrators to monitor performance, configure hardware settings, and troubleshoot issues seamlessly. This ease of management is bolstered by automation capabilities, enabling organizations to enhance operational efficiency.

In conclusion, the IBM 8260 stands out in the competitive server landscape due to its high processing power, extensive memory and storage options, advanced connectivity, reliability features, and robust management tools. Such attributes make it a viable choice for organizations seeking to enhance their IT infrastructure and streamline their operations effectively.