LonWorks Communication Bus Fundamentals
Network Guide 55
Free Topology
Free topology is a flexible wiring structure for communication channels that include ring, star,
loop and/or combination wiring structures. A free topology does not have restrictions such as
branching restrictions, stub length limits, device separation requirements or strict termination
guidelines. The free topology transmission specification only has two requirements that must
be met for proper system operation. The distance from each transceiver to all other transceiv-
ers and to the termination must not exceed the maximum node-to node distance. If multiple
paths exist (i.e. a loop topology) then the longest path should be used for calculations. The
maximum total wire length is the total length of wire within a segment. See Network Cables on
page 55 for detailed information about wiring lengths and network cable considerations.
Figure 33: Free Topology
TP/FT 10 Free Topology Network Termination
For free topology type networks (TP/FT 10 only), use the terminator shown below for each free
topology channel. It is recommended to always place the terminator near the router for consis-
tency.
Network Cables
The following section identifies the type of cabling that may be used in a TP/FT 10 twisted pair
L
ONWORKS network. The recommendations presented herein are intended to assist network
integrators and OEMs and are provided for informational purposes only.
R1 = 52.3Ω, ±1%, ⅛W
C1 = 100µF, ≥50V
C2 = 100µF, ≥50V
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