Bosch DCN Wireless Installation And User Instructions Manual page 24

DCN Wireless | Installation and User Instructions | System Design and Planning
3.6.3 Optical fiber length
Because of optical attenuation, the maximum length of
optical network cables (LBB4416) is 50 m. You can use
GOF and fiber interfaces to increase the distance
between devices to a maximum of 1500 m.
Note
If the distance between two devices is less than
100 m, use a network splitter between devices
to remove the use of fiber interfaces. Use only
the trunk sockets of the network splitter in this
case.
3.6.4 Cable couplers
You can use the LBB4419/00 Cable Couplers to
connect optical network cables to each other. A cable
coupler causes optical attenuation. Each cable coupler
decreases the maximum distance between two devices
in the optical network (normally 50 meters) with
20 meters.
2150
2050
1950
1850
1750
1650
1550
1450
1350
1250
1150
1050
950
0 5
figure 3.2: Cable correction graph
Bosch Security Systems | 2007-02 | 9922 141 70691 en
10 15 20 25
3.6.5 Maximum cable length
The maximum cable length (LBB4416 and GOF) of the
optical network is dependent on:
• The number of nodes
• The number of LBB4414/10 Fiber Interfaces
Do as follows:
1 Find the number of nodes of each device from the
node value table (refer to table 3.1). Add together the
nodes of all devices.
2 With the value of step 1, use the graph (refer to
figure 3.2) to find the maximum cable length without
LBB4414/10 Fiber Interfaces.
3 Count the number of LBB4414/10 Fiber Interfaces.
Each fiber interface decreases the maximum cable
length from step 2 with 18 m.
30 35 40
Nodes
45 50 55 60 63
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