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IBM AS/400e

IBM AS/400e
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IBM 9309 Rack Enclosures
412 AS/400e System Handbook
#5040 Bus Extension Unit
The Bus Extension Unit provides 11 additional I/O card slots to an existing I/O bus. It can
attach to an existing I/O bus on 9406 Models 300 (with #5142), 310, and 320. It also supports
external DASD, tape, and diskette devices.
If replacing a Model 3xx with a Model 7xx, a #5040 must be converted to a #5044 in order to
be used on the Model 7xx. It requires an Optical Bus Adapter Card (#2673, #2674, #2695, or
a spare slot on the Base Optical Bus Adapter) and an Optical Link Processor Card (#2686)
for attachment.
#5042 and #5044 System Unit Expansion Rack
The System Unit Expansion Rack is a 12-card slot expansion rack, which can also support
external DASD, tape, and diskette devices. This feature provides two additional I/O buses
with six I/O card slots per bus. The #5042 attaches to the 9406 Model 310 and 320 using a
#5042 fiber optic attachment cable.
If replacing a Model 3xx with a Model 7xx, the #5042 is converted to a #5044 to be used on
the Model 7xx. It requires an Optical Bus Adapter Card (#2673, #2674, #2695, or a spare slot
on the Base Optical Bus Adapter) and an Optical Link Processor Card (#2686) for
attachment.
The following diagrams illustrate the rack configurations and detail where devices will be
installed.

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