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

 

 

 

 

6947ch03.fm

 

 

 

 

 

 

 

 

 

 

 

Number of

Maximum number

 

CHPID

Config.

 

 

 

 

 

 

 

I/O feature

Feature codes

Ports

Ports

 

I/O

PCHID

rules

Ports

definition

 

 

 

notes

 

 

per card

increments

slots

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OSA-E Fast Ethernet

2366

2

2

24

12

yes

OSE, OSD

1, 2, 3

 

 

 

 

 

 

 

 

 

OSA-E Token Ring

2367

2

2

48

24

yes

OSE, OSD

1, 2

 

 

 

 

 

 

 

 

 

Notes:

1.The total number of FICON Express, OSA-Express, PCIXCC, and PCICA cards cannot exceed 20 per I/O cage.

2.The sum of OSA-Express GbE, 1000BASE-T Ethernet, Fast Ethernet and Token Ring cards cannot exceed 24.

3.OSA-Express GbE LX/SX (FC 2364 and 2365) and OSA-Express Fast Ethernet (FC 2366) can only be brought forward on an upgrade; new adapters cannot be ordered.

OSA-Express GbE LX (feature code 1364)

The z990 OSA-Express Gigabit (GbE) Long Wavelength (LX) feature (feature code 1364) occupies one slot in the z990 I/O cage and has two independent ports, with one PCHID associated with each port.

Each port supports connection to a 1 Gbps Ethernet LAN via 9 micron single-mode fiber optic cable terminated with an LC Duplex connector. This feature utilizes a long wavelength (LX) laser as the optical transceiver.

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 1364) supports Queued Direct Input/Output (QDIO) mode only, full-duplex operation, jumbo frames, and checksum offload. It is defined with CHPID type OSD.

OSA-Express GbE SX (feature code 1365)

The z990 OSA-Express Gigabit (GbE) Short Wavelength (SX) feature (feature code 1365) occupies one slot in the z990 I/O cage and has two independent ports, with one PCHID associated with each port.

Each port supports connection to a 1 Gbps Ethernet LAN via 62.5 micron or 50 micron multimode fiber optic cable terminated with an LC Duplex connector. The feature utilizes a short wavelength (SX) laser as the optical transceiver.

The z990 OSA-Express GbE SX feature (feature code 1365) supports Queued Direct Input/Output (QDIO) mode only, full-duplex operation, jumbo frames, and checksum offload. It is defined with CHPID type OSD.

OSA-Express GbE LX (feature code 2364, upgrade only)

The z990 OSA-Express GbE LX feature (feature code 2364) can only be brought forward on an upgrade. Its replacement adapter for new orders is the z990 OSA-Express GbE LX feature

(feature code 1364).

Chapter 3. I/O system structure

99

Page 112 Page 114
Page 113
Image 113
IBM 990 manual OSA-Express GbE LX feature code, OSA-Express GbE SX feature code
Page 112 Page 114

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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