Page 7 of 14
NPPA-TT-SD50 Instruction Manual
4. Grounding variations
The patch panel is terminated with 4 Sub-D connectors each of them corresponding to groups
(Sub-D groups) of 12 channels. Each Sub–D connector has only two ground contacts:
•
one for the top row connecting all top row ground contacts
•
one for the bottom row connecting all bottom row ground contacts
Each Sub-D group is configured by its own jumper block. The flexible grounding system
provides the following alternatives to choose from:
•
Chassis Common:
All channel grounds (top & bottom row) are
connected via PCB and jumpers to the patch panel
chassis as standard (delivery configuration).
•
Sub-D-Group-Central:
Ground contacts of top and bottom row are
connected but separated from chassis.
•
Sub-D-Group-Chassis Top or Bottom:
Either top or bottom ground contacts are connected
to chassis.
•
Floating of individual channels:
The ground contacts of top and/ or bottom
jacks of each channel can be disconnected
from a Sub-D Group by cutting the tracks
between the corresponding solder pads.
