56 Network Guide
For more information and detailed explanations on network topology and wire length restric-
tions refer to the Junction Box and Wiring Guideline for Twisted Pair
LONWORKS® Networks.
These guides can be downloaded from Echelon's web site at www.echelon.com.
TP/FT 10 Cable Specifications
Two types of cable are recommended for TP/FT 10 channel installations.
Type 1:
22 AWG (Ø0.65mm), 1 twisted pair (1P), stranded conductor (STR), tinned copper (TNC),
PVC insulation, PVC jacket, unshielded, plenum FT6, CSA 600V, UL 300V.
• As a general rule, the TP/FT 10 channel communication cables should not be
run close to high voltage power cables.
• All wiring must comply with applicable national, state and local wiring electrical
codes, ordinances, and regulations.
Table 11: TP/FT 10 Channel Attributes
Parameter Details
Nickname Free Topology
Raw Bit rate 78kbps
Packets per second 144/168
Peak traffic 180/210
Topology Free, Bus
Termination -One per segment in free topology
-Two per segment in bus topology
Maximum number of
devices per segment
64
Note: A maximum of 128 devices per channel can be installed
on a TP/FT 10 when a router or repeater is used. See Extending
the Network on page 59 for more information.
Table 12: TP/FT 10 Type 1 Cable Attributes
Parameter Details
Conductor Gauge (AWG) 22 AWG (see also Metric Conversions for Wire Gauge on
page 133).
Conductor Count 2 Conductors (twisted pair)
Conductor Type Stranded conductor
Material Tinned copper
Plenum Plenum rated
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