Optex Fiber SenSys Terrain Defender TD 100 Installation Manual page 33

There is passive circuitry inside the SUM that connects the RF from the lead-in cable to the
leaky sensor cable, providing lightning suppression and 24 or 48VDC power over each sensor
cable. In most applications, there are two SUMs inside a SUMA to support sensor cables going
in opposite directions. When the processor is at the end of an open perimeter there will only be
one shielded termination per SUMA.
The processors on the perimeter, receive power over the sensor cables. The SUM allows power
to pass through the SUMA from side to side directly from one pair of sensor cables to the next.
The power is supplied in parallel over both the TX and RX sensor cables, providing redundancy.
Each processor receives its power over the TX and RX lead-in cables from the SUMA. This
ensures a redundant power connection with only the power going to the processor over the
lead-in cables. This process ensures that power goes to all processors even if the lead-in cables
are cut, or a processor should fail. The perimeter power disseminates from SUMA to SUMA
redundantly on the TX and RX sensor cable, and in a closed perimeter, from both ends of the
perimeter. This supports the hallmark redundancy of operation of the TD100.
The lead-in cables come in a standard 10 m (30 ft) lengths with factory-installed ferrite beads
and SMA connectors at each end. When there is excess lead-in cable, bury to the outside of the
detection zone created by the sensor cables; see
TX/RX SMA connector on the TD100 processor and then at the ferrite bead end to the SUM
inside the SUMA.
Custom cable lengths available. Additional lead-in may affect maximum sensor length.
Contact Fiber SenSys Sales or Technical Support for more information.
Page 33
Figure
Figure 25. Lead-In Cable Overview (Side)
29. The lead-in cable connects to the
Outer Jacket
Overall Braid
Shield
Center Conductor
Dielectric
Confidential – Limited Distribution