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library 2. The base module is fourth from the bottom, and is surrounded by six expansion modules. The

maximum 21U conguration cannot be built in any other way. The third example is a full 48U library 3.

In this conguration, the base module is roughly in the middle with seven expansion modules above and

eight below, fteen expansion modules total. The maximum 48U conguration cannot be built any other

way.

Figure 3. Conguration comparison

Differences between 21U and 48U libraries

This section references the differences between a library with the previous 21U height maximum and the

current 48U height maximum.

The differences between these two types of libraries can be seen in their maximum congurations. Refer

to Structure and supported library congurations.

Library Differences

• The only hardware difference between the two congurations is the spooling cable. A new spooling

cable assembly (also referred as spool) is designed to enable the library to extend up to 48U maximum

height.

• New library rmware 1.6.1.0 is needed to support a 48U library. Firmware 1.6.1.0 cannot be down-

leveled to a previous rmware level.

• The element numbering scheme is different for 21U and 48U libraries. Refer to Numbering scheme

details.

IBM Condential

Chapter 1. Overview3

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