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IBM 8260 manual Jitter Attenuator Daughter Card Jadc, Components of Dpll Implemented on Jadc

Models: 8260

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8.4 Jitter Attenuator Daughter Card (JADC)

The JADC can be mounted on any 8260 token-ring module and contains a DPLL function. It must be installed on a module under the following circumstances:

1.Your 18-port active module is configured with ports 17 and 18 acting as RI/RO ports and these ports are connected to a non-8260 hub.

2.The fiber ports on the dual-fiber repeater module are connected to a non-8260 hub.

Note: The dual-fiber repeater module provides two sets of RI/RO pairs and you must install one JADC for each pair which is connected to a non-8260 hub. This module has the ability to accommodate two JADCs.

3.The 20-port passive module must always have a JADC. In fact, this module is shipped from the factory with the JADC already installed and must never be removed.

The DPLL on the Jitter Attenuator Daughter Card is similar to the DPLL implemented on each port of the 8260 active token-ring modules. The only difference is that the Jitter Attenuator Daughter Card has to cope with a higher amount of jitter which may be accumulated by up to 20 stations that may attach to the passive module or a high number of stations attached to the non-8260 hubs. The size of the buffer used in the Jitter Attenuator Daughter Card is

64-bits as opposed to the 8-bit buffer which is used in the DPLLs implemented on the active modules. Figure 86 shows the components of the DPLL implemented on the 8260 Jitter Attenuator Daughter Card.

Figure 86. Components of DPLL Implemented on JADC

The DPLL of JADC on the passive module is located after the last port. The wideband PLL accepts signals from the last port, whereas the narrowband PLL takes the signal from the wideband PLL and transmits it out toward the backplane. In addition to the JADC, there is a DPLL module physically on the passive module whose narrowband side resides between the backplane and port 1, and its wideband side resides between the JADC and the backplane.

When a JADC is installed on an active module, the JADC is always positioned as a single unit (wideband and narrowband components) between the last trunk port and the backplane. In addition, the DPLL which is always present at each trunk port is changed from a narrowband/wideband configuration to a

Chapter 8. 8260 Token-Ring Support 141

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IBM 8260 manual Jitter Attenuator Daughter Card Jadc, Components of Dpll Implemented on Jadc
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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.