Echelon LonPoint Module - Manual (Page 26)

3-4 Network Cabling and Connections
The Model 42100 LPR-10 Router (TP/FT-10 to TP/FT-10) uses the TP/FT-10 channel
cabling scheme. The Model 42102 LPR-12 Router (TP/FT-10 to TP/XF-1250) uses a
different cabling scheme that is designed to handle high speed, 1.25Mbps
communications. This 1.25Mbps cabling scheme is described in a later section.
System Performance and Cable Selection - TP/FT-10 Channel
The system designer may choose a variety of cables, depending on cost, availability,
and performance. Currently, Echelon has documented system performance on the
cable types shown in tables 3.1 and 3.2. Up to 64 devices may be connected to each
channel; one or more Model 42100 LPR-10 Routers may be used to increase the
number of devices and cable distance. Network performance specifications assume
that the average wire temperature is +55°C, although individual segments of wire
may be as hot as +85°C.
The free topology transmission specification includes two components which must
both be met for proper system operation. The distance from each LonPoint module,
network interface, or third party device to all other devices, and the distance from
each LonPoint module, network interface, or third-party device to the Model 44100
Terminator, must not exceed the maximum node-to-node distance. If multiple paths
exist, e.g., a loop topology, then the longest path should be used for the calculations.
The maximum total wire length is the total amount of wire connected per channel.
Table 3.1 Free Topology Specifications
Maximum
node-to-node
distance Maximum total
wire length Wire Diameter
AWG/mm
Belden 85102 500 meters 500 meters 16AWG/1.3mm
Belden 8471 400 meters 500 meters 16AWG/1.3mm
Level IV, 22AWG 400 meters 500 meters 22AWG/0.65mm
JY (St) Y 2x2x0.8 320 meters 500 meters 20.4AWG/0.8mm
TIA Category 5 250 meters 450 meters 24AWG/0.51mm