Motorola 68230 - Vanguard 300 DSU/CSU Operator's Manual page 58

Example of DIM Replacement on Motherboard
DIMs may be replaced in the field, as shown in Figure 4-8, using the same DIM
removal strap used for the 6500 Series products.
Adding or Replacing a DIM Site Daughtercard
Introduction
This section describes how to add or replace a DIM Site daughtercard.
The DIM Site daughtercard provides an optional V.24, V.35, V.36, or V.11
interface and attached DIM with a DB25 connector and comes installed from the
factory if you ordered one.
Figure 4-8. DIM Replacement on Motherboard