Technical data

38 ATS Designers Guide
1
2
4
32
. . . .
1500m
3
5
31
9m
T
T
Drawing 3-5 Chain connection with branches from the main bus course.
3.1.3.2 Increasing the system bus range
• ATS1740 Repeaters - Isolators
The system bus can be increased using the insulator/amplifier ATS1740. Each repeater
increases the bus range by 1500m. The total bus range is limited to 6km which means
that the maximum number of cascade connected repeaters is 3.
1
2
ATS1740
32
. . . .
1500m
1500m
T
TT
T
Galvanic
insulation1.5kV
Drawing 3-6 Using the ATS1740 amplifier to increase the bus range.
• ATS1743 Optical fibre interface.
Another method of increasing the bus range is by using optical fibres and the ATS1743
interface. The device uses the popular, and relatively cheap multi-mode 62,5/125um
optical fibres, working in the lower infrared range – 820nm wavelength. It provides a
cheap and tested solution to the bus range problem. The device can work in two modes:
− Point-To-Point – with a double optical fibre – this way 2 system branches, 1500m
each, can be connected.
− Multi drop – with a single optical fibre– in this way the whole system bus can be
designed using only optical fibres, or more branches can be connected in a star
configuration (see chapter Star configuration) or branched bus.
The maximum distance between two ATS1743 interfaces is dependant on the
parameters of the installed optical fibre and on the quality of the connections. A typical
value of optical budget for the connection is 15dB.