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

The z990 OSA-Express GbE LX feature occupies one slot in the z990 I/O cage and has two independent ports with one PCHID associated with each port. This feature supports the 1000BASE-SX standard transmission scheme.

Each port supports connection to a 1 Gbps Ethernet LAN via 9 micron single-mode fiber optic cable terminated with an SC Duplex connector.

Multimode (62.5 or 50 micron) fiber cable may be used with the z990 OSA-Express GbE LX feature. The use of these multimode cable types requires a mode conditioning patch (MCP) cable to be used at each end of the fiber link. Use of the single-mode to multimode MCP cables reduces the supported optical distance of the link to a maximum end-to-end distance of 550 meters.

The z990 OSA-Express GbE LX feature (feature code 2364) only supports QDIO mode and TCP/IP. It is defined with CHPID type OSD. The Enterprise Extender (EE) function of Communications Server for z/OS and OS/390 allows you to run SNA applications and data on IP networks and IP-attached clients.

OSA-Express GbE SX (feature code 2365, upgrade only)

The z990 OSA-Express GbE SX feature (feature code 2365) can only be brought forward on an upgrade. Its replacement adapter for new orders is the z990 OSA-Express GbE SX feature

(feature code 1365).

The z990 OSA-Express GbE SX feature occupies one slot in the z990 I/O cage and has two independent ports with one PCHID associated with each port. This feature supports the 1000BASE-SX standard transmission scheme.

Each port supports connection to a 1 Gbps Ethernet LAN via 62.5 micron or 50 micron multimode fiber optic cable terminated with an SC Duplex connector.

The z990 OSA-Express GbE SX feature (feature code 2365) only supports QDIO mode and TCP/IP. It is defined with CHPID type OSD. The Enterprise Extender (EE) function of Communications Server for z/OS and OS/390 allows you to run SNA applications and data on IP networks and IP-attached clients.

OSA-Express 1000BASE-T Ethernet (feature code 1366)

The z990 OSA-Express 1000BASE-T Ethernet, feature code 1366, occupies one I/O slot in the z990 I/O cage and has two independent ports, with one PCHID associated with each port.

Each port supports connection to either a 1000BASE-T (1000 Mbps), 100BASE-TX (100 Mbps), or 10BASE-T (10 Mbps) Ethernet LAN. The LAN must conform either to the IEEE 802.3 (ISO/IEC 8802.3) standard or the DIX V2 specifications.

Each port has an RJ-45 receptacle for cabling to an Ethernet switch that is appropriate for the LAN speed. The RJ-45 receptacle is required to be attached using EIA/TIA category 5 unshielded twisted pair (UTP) cable with a maximum length of 100 m (328 ft).

The OSA-Express 1000BASE-T Ethernet feature supports auto-negotiation and automatically adjusts to 10 Mbps, 100 Mbps, or 1000 Mbps, depending upon the LAN.

LAN speed and/or the duplex mode can be set explicitly, using OSA/SF or the OSA Advanced Facilities function of the z990 server hardware management console (HMC). The explicit settings will override the OSA-Express feature port ability to auto-negotiate with its attached Ethernet switch. You can choose any one of the following settings for the OSA-Express 1000BASE-T Ethernet feature:

￿Auto-negotiate

100IBM eServer zSeries 990 Technical Guide

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IBM 990 manual OSA-Express GbE SX feature code 2365, upgrade only, OSA-Express 1000BASE-T Ethernet feature code
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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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