8
System
Performance
• The average temperature of the wire
must not exceed 131° F. Individual
segments of wire may be as hot as
185° F.
System
Specifications
Free topology system specifications and
transmission specifications are described
below. Both specifications should be met to
ensure proper operation.
The transmission specification depends on such
factors as resistance, mutual capacitance and
the velocity of propagation.
The system designer may choose from a variety
of cables, depending on cost, availability, and
desired performance. Performance may vary
with cable type. Contact Echelon for cable types
and the characterization of system performance.
Note
The following specifications are for
one network segment. Multiple
segments may be combined using
repeaters to increase the number of
nodes and distance.
Transmission
Specifications
Free Topology nodes run at 78 kbps
transmission speeds.
Doubly-
Terminated
Bus
Topology
Specifications
Free
Topology
Specifications
Cable
Specifications
Trane recommends the use of shielded
LonWorks communication cable, for example
• Up to 64 FTT-10 transceivers are allowed
per network segment.
18 guage shielded twisted pair, tinned-copper
conductors (Trane "purple" wire).
Belden 85102 1650 ft 1650 ft
Belden 8471 1300 ft 1650 ft
Level IV, 22AWG 1300 ft 1650 ft
JY (St) Y 2x2x0.8 1050 ft 1650 ft
*Trane 400-2028 1300 ft 1650 ft
Belden 85102 8850 ft 7200 ft
Belden 8471 8850 ft 7200 ft
Level IV, 22AWG 4500 ft 3800 ft
JY (St) Y 2x2x0.8 2950 ft 2450 ft
*Trane 400-2024 4500 ft 3800 ft
*Recommended
