Cabling; Optical Fiber Length - Bosch DCN Next Generation Installation And Operation Manual

Conference System
4.2.5

Cabling

The devices that communicate via the optical network have two network sockets for loop-
through. Close the optical network to a full circle to make the system redundant for optical
network disconnections.
The standard optical network cables (LBB4416) are Plastic Optical Fiber (POF) and have a
maximum length of 50 m. To cover longer distances, conversion to Glass Optical Fiber (GOF)
must be done.
NOTICE!
The two optical network connectors on the devices are the same, it does not matter if the
right or left one is used.
4.2.6

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 more
than 50 m and less than 1500 m (refer to Section 3.34 PRS-FINNA Fiber Interface). The total
sum of the used Plastic Optical Fiber plus the Glass Optical Fiber plus the equivalent cable
length of the used devices (refer to Table 4.6) should not exceed 2090.
For example (the equivalent cable length between brackets behind each device); On one side
of the building are a Central Control Unit (24) and Audio Expander (18) used. On the other
side of the building a Central Control Unit (24), Audio Expander (18) and an 8 Channel
Integrus Transmitter (24) are used. Both sides are connected in a redundant loop
configuration using PRS-FINA (2 x 2 x 16). To connect all equipment on both sides, 7 POF
cables are used of 2 m each. The maximum total length of the GOF cables is 1904 meters.
Calculation; 2090 – (24 + 18 + 24 + 18 + 24 + 64 + 14) = 1904.
NOTICE!
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.
Bosch Security Systems B.V. Installation and Operation manual
Planning | en
DCN-NG_IOM_V4.1 | V1.3 | 2012.07
81