Technical information

Troubleshooting and Repair
139
Troubleshooting
Powering Up the DSU Nodes
1. Connect the external power cord at the rear of the node.
2. Set the power switch on the rear of the node to”I” (ON).
3. Complete the procedure Checking a Non-redundant
System on page 157 or Checking a Redundant System
on page 158.
4. If your system is redundant, set ACTIVITY FREEZE (at
the control node) to OFF.