Towers and Racks 269
Towers and Racks
– One or more Power Distribution Units (PDUs) are required when the #0578s are to be
installed in a #0550 or #0551 rack. Each #0578 requires two #1422 PDU power cords
to be connected to two plugs in the PDU.
IBM 9309 Rack Enclosure
The 9309 Rack Enclosures provide operator control panels, acoustic noise reduction, power
control to all units within the rack (under the control of the System Unit), and power control to
the next rack SPCN chain. All additional racks attached to the system unit are termed
“secondary” racks.
AS/400 9406 models support the 9309 Rack Enclosures. External I/O devices, such as
DASD, magnetic tapes, and diskette units, can be accommodated in these 1.6 M racks.
These 9309 Rack and System Unit Rack Enclosures are supported:
• 9309 #9171: General Purpose I/O Rack with SPCN
• 9406 #5044: System Unit Expansion Rack (9406-5X0, 620, 640, and 650 models only)
High Speed Links (HSL)
HSL Fabric
HSL at OS/400 V5R1 was initially implemented using copper interconnect cables. These
cables allow for high speed and high quality parallel data transfer. In August 2001, technology
is introduced using optical fibers and optical adapters to interconnect the Central Electronic
Complex (CEC) and the towers of the AS/400e.
The copper HSL cables have a higher bandwidth compared to the optical HSL cables. The
optical cables are available in longer lengths (up to 250m compared to 15m for copper).
Optical cables are smaller and easier to work with, particularly at installation.
The longer optical cable lengths extend the distance between I/O units and the Model 830
and Model 840 servers from the current 15m to 250m. Expanded I/O location alternatives can
help improve data reliability and protection.
The HSL bus structure provides:
• Performance improvements and future system growth
– Up to 1 GB/sec technology (copper HSL cables)
– 700 MB/sec maximum deliverable capacity running full duplex
• Simplified implementation
– Loop technology for redundancy
– Multiple towers per loop
– 3m, 6m, 15m copper HSL cables
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