Cabling - Bosch DCN Next Generation Installation And User Instructions Manual

DCN NG | Installation and User Instructions | Section 5 | System Installation
27.5

Cabling

27.5.1 Introduction
All units in the optical network are equipped with two
interchangeable optical network sockets. Use one of
these connectors to connect a unit to the previous unit
and the other to connect it to the next unit in the chain.
Note
Both optical network connectors are identical.
27.5.2 POF cable length
Due to light loss, the maximum length of optical
network cables (LBB4416/xx) is 50 m. If the distance
between two pieces of equipment in the optical network
is more than 50 m and less than 1500 m, fiber interfaces
(LBB4414/00) and glass optical fiber (GOF) must be
used (see figure 27.2).
POF
3
7
GOF ( > 50m)
figure 27.2: Using the fiber interface
Bosch Security Systems | 2004-03 | 9922 141 70521en
If GOF cables are used, make sure that they:
•
•
•
•
27.5.3 Optical fiber length
The maximum length of all optical fibers together (both
POF and GOF) in the optical network depends on the
number of nodes in the system (see table 27.1 for a list
POF
of node values). The graph (see figure 27.4) shows the
relation between the number of nodes in the optical
network and the maximum optical fiber length.
3
7
are multimode GOF cables (single mode GOF
cables are not supported);
have a maximum attenuation of 2 dB/km;
are suitable for light with a wavelength of 1300 nm;
are terminated with standard SC connectors.
Note
It is also possible to increase the distance
between units above 50 m by inserting network
splitters (LBB4410/00) every 50 m or less.
Although no tap-off may be required, the
network signal is regenerated in the network
splitter to cover another 50 m. Use only the
trunk sockets in this case.
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