TDT System 3 Installation Manual page 36

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To connect one Optibit interface:
1. Connect the red end of a 5-meter cable to the output of the
PO5/PO5e/LO5. The PO5/PO5e is marked with a red dot labeled
OUT. The LO5 has the text {RED}.
2. Connect the other end of this cable (blue) to the input on the
Optibit interface (labeled IN).
3. Connect the red end of the second 5-meter cable to the output of
the Optibit interface (labeled OUT).
4. Connect the other end of the second cable to the input of the
PO5/PO5e/LO5 (not labeled).
System 3 Installation Guide