the token-ring paths marked as ″available″ are the parts of the Enhanced TriChannel that are not currently used by any type of network.

On the ShuntBus, in addition to the two dedicated Ethernet segments, there are 10 token-ring segments. Unlike, the Enhanced TriChannel, there is no concept of token-ring paths on the ShuntBus. Instead, there are 10 physical rings on the backplane. Each of these rings is a set of 6 pins which is routed from slot to slot on the backplane and is completed across each slot via a self-shorting connector. At the end of the backplane, the signal path is returned from slot 17 to slot 1. In this manner, a ring is formed. When a module is inserted into the backplane, the self-shorting connector opens and the signal is routed onto the module. Therefore, any installed token-ring module on the ShuntBus has access to any of the 10 token-ring segments on the backplane. This design allows the implementation of per-port switching for the token-ring modules so that individual ports on a module can be assigned to different rings on the backplane. This concept is shown in Figure 7. Details of the per-port switching feature for token-ring modules is provided in Chapter 8, ª8260 Token-Ring Supportº on page 129.

Figure 7. ShuntBus and Token-Ring

Each token-ring interface on the ShuntBus connector uses three Shunt pairs (low resistance connectors) to form one token-ring network on the backplane. The three Shunt pairs carry a clock and two data signals.

When a token-ring module is inserted into the ring, the 3 Shunt pairs connect to

6 signal lines on the module as:

∙

∙

Clock transmit

Data A transmit

Chapter 2. Backplane Architecture 21

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IBM 8260 manual ShuntBus and Token-Ring
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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.
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