Specifications

LONWORKS® LN-Series Network Communication and Interface Guide Technical Bulletin 15
Network Cables
The following section identifies the type of cabling that may be used in a TP/FT-10
or TP/XF-1250 twisted pair LONWORKS network.
Note: Do not run TP/FT-10 channel communication cables close to high voltage
power cables. Running these cables near each other may cause poor
communication.
TP/FT-10 Cable Specifications
Two types of cable are recommended for TP//FT-10 channel installations.
The first type of cable is 22 AWG, 1 twisted pair (1P), stranded conductor (STR),
tinned copper (TNC), Polyvinyl Chloride (PVC) insulation, PVC jacket,
unshielded, plenum FT6, CSA 600V, and UL 300V.
In a Bus topology, the maximum wire length is 1,400 m (4,593 ft).
In a Free topology, the maximum wire length is 400 m (1,312 ft) node-to-node and
500 m (1,640 ft) total wire length.
The maximum stub length on a TP/FT-10 channel is 3 m (10 ft). A stub is a section
of transmission line that is not terminated and branches off the main transmission
line. The branch line is terminated as an open circuit.
IMPORTANT: Make all wiring connections in accordance with local,
national, and regional regulations. Do not exceed the device’s electrical ratings.
IMPORTANT: Use only twisted pair cable or wire and conductors on a
LONWORKS twisted pair channel.
!
CAUTION: Risk of Property Damage.
Do not use untwisted wires or cables containing flat or parallel
untwisted conductors on a LonWorks twisted pair channel. Using
untwisted wire, cable, and conductors on a LonWorks twisted pair
channel may result in improper network operation, and an electric
field can build up and spike causing damage to the devices connected
to the channel.
Table 7: TP/FT-10 Cable Specifications (22 Gauge)
Attributes Specifications
Conductor Gauge (AWG) 22 AWG
Conductor Count 2 Conductors (Twisted Pair)
Conductor Type Stranded Conductor
Material Tinned Copper
Plenu Plenum Rated
NEC Rating UL Listed NEC Article 800 Communications Plenum (CMP)
Rated
CSA Flame Rated