Connections - Bosch DCN Next Generation Installation And User Instructions Manual
Digital congress network
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DCN NG | Installation and User Instructions | Section 4 | Installation Accessories
19.3
Connections
19.3.1 Introduction
This section gives an overview of typical system
connections using the fiber interface:
•
Connecting the POF cable (see section 19.3.2).
•
Connecting the GOF cable (see section 19.3.2).
•
Connecting an external power supply (see
section 19.3.3).
19.3.2 Connecting POF and GOF cables
Fiber interfaces convert from POF to GOF to connect
two pieces of equipment in the optical network of the
system that are more than 50 m apart and less than
1,500 m. Usually they are used in pairs. The first
converts from POF to GOF, whereas the second
converts from GOF back to POF (see figure 19.2).
POF
3
7
GOF ( > 50m)
figure 19.2: Connecting the fiber interface
Bosch Security Systems | 2004-03 | 9922 141 70521en
19.3.3 Connecting a power supply
The fiber interface is delivered with a separate Kycon
KPP-4P connector to connect the external power supply
to the fiber interface. The Kycon KPP-4P connector has
four pins (see figure 19.3):
POF
3
If the fiber interface uses an external power supply and
7
the system power supply is present as well, it is possible
that the system voltage (nominally 48 V) is higher than
the external power supply voltage. In that case, this
higher voltage is forced on the output of the external
power supply.
Many external power supplies are not able to accept this
and get defective as a result. To isolate the external
power supply from a higher terminal voltage, a series
diode should be inserted between the external power
supply and the fiber interface (see figure 19.4).
2
1
4
3
figure 19.3: Kycon KPP-4P connector
table 19. 1 : Kycon KPP-4P connector details
Pin
Signal
1
Ground
2
Power from local power supply
(max. 48 V/5 A)
3
Power from the system
(max 48V/5 A)
4
Not connected
Note
For detailed connector assembly instructions,
see appendix A.
en | 114
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