NEC DS2000 Hardware Manual page 30

Connecting Blocks
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2-12 Section 2: PCB Installation
Figure 2-14: Securing the Cables
If you are using non-suffixed PCBs in a 4 Slot Cabinet, install RFI Suppressor
Assemblies on your station and trunk cables as shown below.
The suppressors must be mounted inside the cabinet and as close to the appropriate
PCB as possible.
Figure 2-15: Installing the RFI Suppressor
DS2000 Hardware Manual