IBM TS4300

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