If the cables are too long, there is not enough room inside of the rack to handle the
extra length and excess cable might interfere with the service process, preventing
concurrent repair. Consider the following specifications and limitations before you
order this feature:
v In contrast to the raised-floor power cords, which have a length from the tailgate
to the connector of about 4.9 m (16 ft), the length of the top exit power cords are
only 1.8 m (6 ft) from the top of the storage system.
v IBM Corporate Safety restricts the servicing of your overhead equipment to a
maximum of 3 m (10 ft) from the floor. Therefore, your power source must not
exceed 3 m (10 ft) from the floor and must be within 1.5 m (5 ft) of the top of
the power cord exit gate. Servicing any overhead equipment higher than 3 m (10
ft) requires a special bid contract. Contact your technical service representatives
for more information on special bids.
v To meet safety regulations in servicing your overhead equipment, you must
purchase a minimum of one feature code 1101 for your top exit bracket feature
per site. This feature code provides a safety-approved 5-foot ladder. This ladder
provides technical service representatives the ability to perform power safety
checks and other service activities on the top of your storage system. Without
this approved ladder, technical service representatives are not able to install or
service a storage system with the top-cable exit features.
v To assist you with the top-exit host cable routing, feature code 1400 provides a
cable channel bracket that mounts directly below the topside of the tailgate and
its opening. Cables can be easily slid into the slots on its channels. The cable
bracket directs the cables behind the rack ID card and towards the rear, where
the cables drop vertically into a second channel, which mounts on the left-side
wall (when viewing the storage system from the rear). There are openings in the
vertical channel for cables to exit toward the I/O enclosures.
Accommodating cables
You must ensure that the location and dimensions of the cable cutouts for each
frame in the storage system can be accommodated by the installation location. An
overhead-cable management option (top-exit bracket) is available for DS8880 for
environments that have special planning and safety requirements.
Use the following steps to ensure that you prepare for cabling for each storage
system:
1. Based on your planned storage system layout, ensure that you can
accommodate the locations of the cables that exit each frame. See the following
figure for the cable cutouts for the DS8880.
Chapter 6. Delivery and installation requirements 135
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