Panasonic DBS 40 Manual page 67

and Lines
Chapter 4. Trunks
Section 300-installation
2. Attach the Sync Unit to the CPC-B card.
Note: Before attaching the Sync Unit. insert the three spacers provided
with the unit and remove the jumpers from CN2 of the CPC-B card.
(Version 1.3
or higher)
CPC-B Card
4-22