Technical data

40 ATS Designers Guide
1
ATS1743
32 . . . .
ATS1743
ATS1743
Optic fibre
L
Galvanic
insulation
Drawing 3-9 Fibre-optic bus design using the ATS1743 interfaces
• Dedicated leased line modem
A modem connection on a dedicated line can be used to extend the bus range. Maximum
range of the connection is 3km – minimum cat. 2 phone cable, line without amplifiers,
MOD6000 modems. It is not permissible to use the internal phone network to connect the
subsystems. Due to security concerns, the line must be dedicated to ensure permanent
connection. Maximum length of connected bus branches is 1000m.
1
2
ATS1741
32
. . . .
MOD6000
ATS1741
MOD6000
1000m
1000m
L
T
T
T
T
Drawing 3-10 Extending the bus, using modems and a dedicated leased line
3.1.3.3 Star configuration
More than two bus branches can be achieved using the ATS1470 repeater/insulator
modules, or the fibre-optic modules. At the centre of the network is always the control
panel.
• ATS1740 Amplifier modules
When creating a star configuration network using the ATS1470 repeater/insulator
modules up to 6 branches can be connected, with up to 1000m length each.
Table 3-5 Branch length L (m) depending on the number of branches.
Branch count
Number of
ATS1740
Branch length
L (m)
1 1500
4 1500
6 1000
Expanding single branches using additional ATS1470 amplifier/insulator modules is
possible if the total bus length would not exceed 6km. If the planned bus range is larger
than this limit, the use of ATS1743 fibre-optic modules should be taken into
consideration.