2-6 System Description
  6-00054-02 Rev A
Control Module
The CM is a single module, standalone Scalar 1000 library. It 
contains an Operator LCD panel, AC and DC power supplies, 
robot control electronics, and host interfaces. It can be 
attached to an EM to create an expanded Scalar 1000 library. 
The CM differs in tape and drive bay capacity. See Figure 2-1 
on page 2-5.
Each drive bay has the space equivalent of 48 LTO, 40 SDLT, 
44 3590, or 60 AIT cartridges. Each drive bay accommodates:
• One or two 3590 or High Profile DLT tape drives
• One to six DLT/SDLT or LTO tape drives
• From 1 to 12 AIT tape drives
Expansion Module
The EM extends the length of the aisle and adds drives and 
cartridges to the library. The Scalar 1000 maximum 
configuration includes three EMs. These modules extend the 
X-rails (top and bottom) which allow the Accessor to travel 
the length of the library. See Figure 2-1 on page 2-5.