Draft Document for Review April 7, 2004 6:15 pm

6947axA.fm

Ethernet LAN

Bridge

Token-Ring LAN

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G5-G6 Series

zSeries 990

zSeries 900

Figure A-6 Ethernet only - one-path wiring scenario with additional connections

Ethernet only - two-path wiring scenario

Ethernet only - two-path wiring scenario (not applicable to systems with FC 0075. This scenario is included for those who may be reusing a previous Hardware Management Console.)

This Ethernet only wiring scenario, shown in Figure A-7,is also intended for enterprises that currently have Ethernet wiring and do not want token ring wiring introduced into their environment. The two-path scenario is included to provide the possibility of a second, separate and redundant path to the Support Elements.

This wiring scenario requires that FC 3063 (a second Ethernet) be specified with the Support Elements, and that the token ring feature not be ordered with the Hardware Management Console such that no token ring exists in either the Support Elements or in the Hardware Management Console. The Ethernet features assume the use of 10/100 Mbit Ethernet facilities, requiring the use of CAT-5 Ethernet cabling. Since the Support Element Ethernet only feature includes two Ethernet adapters, there are two Ethernet connections available. For this scenario, both the Ethernet cables will be used.

The three communication protocols (SNA, TCP/IP and NetBios) used in Support Element to Hardware Management Console communication are defined for both adapters in the PCMCIA slots of the Support Elements.

It is necessary to connect the “top” Ethernetadapter cable to a customer-supplied local hub capable of 10/100 Mbit Ethernet rates. It is necessary to connect the Ethernet from at least one local Hardware Management Console to the same hub as the Support Elements.

It is necessary to connect the “bottom” Ethernet adapter cable to a customer-supplied local hub capable of 10/100 Mbit Ethernet rates. This second adapter has to be assigned an address on a separate subnet from the first adapter. Any Hardware Management Consoles

Appendix A. Hardware Management Console (HMC) 239

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IBM 990 manual Ethernet only two-path wiring scenario
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990 specifications

The IBM 990 series, often referred to in the context of IBM's pioneering efforts in the realm of mainframe computing, represents a unique chapter in the history of information technology. Introduced in the late 1960s, the IBM 990 series was designed as a powerful tool for enterprise-level data processing and scientific calculations, showcasing the company's commitment to advancing computing capabilities.

One of the main features of the IBM 990 was its architecture, which was built to support a wide range of applications, from business processing to complex scientific computations. The system employed a 32-bit word length, which was advanced for its time, allowing for more flexible and efficient data handling. CPUs in the IBM 990 series supported multiple instructions per cycle, which contributed significantly to the overall efficiency and processing power of the machines.

The technology behind the IBM 990 was also notable for its use of solid-state technology. This provided a shift away from vacuum tube systems that were prevalent in earlier computing systems, enhancing the reliability and longevity of the hardware. The IBM 990 series utilized core memory, which was faster and more reliable than the magnetic drum memory systems that had been standard up to that point.

Another defining characteristic of the IBM 990 was its extensibility. Organizations could configure the machine to suit their specific needs by adding memory, storage, and peripheral devices as required. This modular approach facilitated the growth of systems alongside the technological and operational demands of the business environments they served.

In terms of software, the IBM 990 series was compatible with a variety of operating systems and programming environments, including FORTRAN and COBOL, enabling users to access a broader array of applications. This versatility was a significant advantage, making the IBM 990 an appealing choice for educational institutions, research facilities, and enterprises alike.

Moreover, the IBM 990 was engineered to support multiprocessing, which allowed multiple processes to run simultaneously, further increasing its effectiveness in tackling complex computing tasks.

In summary, the IBM 990 series represents a significant advancement in computing technology during the late 20th century. With a robust architecture, versatile configuration options, and a focus on solid-state technology, the IBM 990 facilitated substantial improvements in data processing capabilities, making it a cornerstone for many businesses and academic institutions of its time. Its impact can still be seen today in the continued evolution of mainframe computing.
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