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Peripherals
Peripherals
The AS/400 system supports a family of displays and emulation adapters that are known as
the 5250. The supported data stream is, therefore, known as a 5250 data stream. Throughput
considerations are discussed here.
5250 Express Data Stream
The #2720, #2722, #2746, #4746, and #6180 twinax workstation adapter cards have three
major features that can increase throughput:
• 2X Mode: 2 Mbps versus 1 Mbps throughput of the #6050 workstation controller.
• Optimized Mode: The block transfer of data is improved to almost double the
throughput to or from the attached device.
• Dual Mode: Means that two ports are polled simultaneously on the #2722, #2746,
#4746 and #6180 workstation controllers. On older controllers (such as the #6050
work station controller), only one port out of eight is active at any given time.
The enhancement produces nearly four times the throughput when all of the attached devices
on a port support 5250 Express Data Stream. All of the IBM devices from the original 5251 up
through the 3489 support the Express Data Stream.
Refer to Informational APAR II11804 for additional details regarding workstation
considerations when attached devices or cabling do not support 5250 Express Data Stream.
Additional information on 5250 Express Data Stream is available on the Web at:
http://www.networking.ibm.com/525/
The IBM 7299 twinax-to-fiber multiplexer fully supports all the new functions of the #2720,
#2722, #2746, #4746, and #6180 workstation controllers.
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