Technical data

www.westermo.com Theoretical and general applications 65
LonTalk
®
data in different ways from one medium to another. It is commonplace for
channels with a slow medium to be connected to a backbone with a faster medium.
This results in logical and physical segmentation of the network, which gives improved
performance and security.
Large LonTalk
®
network considerations
An increase in the transmission range between two or more TP/FT-segments via a
fibre optic cable results in a slight delay in communication between the different
segments. This can cause collisions, which in turn result in retransmission of the data
packet, which can lead to depreciation in network performance. Consequently, we
recommend that the overall length of fibre should not exceed 25 km (15.53 mi). In
accordance with the EIA-709.3 standard, a maximum delay of 36 ms is permitted,
which should permit a transmission distance of 6.8 km (4.23 mi). We recommend the
use of our router LR-11 to ensure communication over greater transmission distances,
several network segments or more nodes at 1250 kbit/s. Nevertheless, we always
recommend that communication on the network is analysed by using a L
ONWORKS
®
protocol analyzer.
1 2 3
4 5 6
7 8 9
0
Open
10°
20°
30°
40°
50°
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•
•
•
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5
4
3
2
1
BV
1 4 85 4 6 0
Router
Radio
Twisted pair 78 kbit/s
1.25 Mbit/s twisted pair
back-bone
Power line
Link power twisted pair 78 kb
B A C K