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

6947ch03.fm

￿10 Mbps half-duplex or full-duplex

￿100 Mbps half-duplex or full-duplex

￿1000 Mbps/1Gbps full-duplex

LAN speed and duplexing mode default to auto negotiation. The OSA-Express 1000BASE-T feature port and the attached switch automatically negotiate these settings. If the attached switch does not support auto-negotiation, the port enters the LAN at the default speed of 1000 Mbps and full duplex mode.

The 1000BASE-T Ethernet feature can be configured as CHPID type OSC, OSD or OSE.

Non-QDIO operation mode requires CHPID type OSE. When configured at 1 Gbps, the 1000BASE-T Ethernet feature has the same attributes as the fiber Gigabit Ethernet features - operates in QDIO mode only (OSD CHPID type), carries TCP/IP packets only, operates in full-duplex mode only, supports jumbo frames, and supports checksum offload.

OSA-Express Integrated Console Controller (OSA-ICC)

The 1000BASE-T Ethernet feature also provides the OSA-Express Integrated Console Controller (OSA-ICC) function, which supports TN3270E (RFC 2355) and non-SNA DFT 3270 emulation. The OSA-ICC function uses a new definition as OSC CHIPD and console controller, and has multiple logical partitions support, both as shared or spanned channels.

With the OSA-ICC function, 3270 emulation for console session connections is integrated in the z990 via a port on the OSA-Express 1000BASE-T Ethernet feature. This can help eliminate the requirement for external console controllers, like 2074 or 3174, helping to reduce cost and complexity. Each port can support up to 120 console session connections.

OSA-ICC can be configured on a port-by-port basis, and is supported at any of the feature settings (10, 100, 1000 Mbps, half or full-duplex).

OSA-Express Fast Ethernet (feature code 2366, upgrade only)

The z990 OSA-Express Fast Ethernet (FENET), feature code 2366, can only be brought forward on an upgrade. The replacement adapter for new orders is the z990 OSA-Express

1000BASE-T Ethernet feature (feature code 1366).

The z990 OSA-Express FENET feature 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 100 Mbps or 10 Mbps Ethernet LAN. The LAN must conform either to the IEEE 802.3 (ISO/IEC 8802.3) standard or the Ethernet V2.0 specifications, and the 10BASE-T or 100BASE-TX standard transmission schemes.

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).

You can choose any one of the following settings for the OSA-Express FENET feature:

￿Auto negotiate

￿10 Mbps half-duplex or full-duplex

￿100 Mbps half-duplex or full-duplex

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.

Chapter 3. I/O system structure 101

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IBM 990 manual OSA-Express Fast Ethernet feature code 2366, upgrade only, OSA-Express Integrated Console Controller OSA-ICC
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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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