Bosch Appliances 9922 141 70691 en Optical fiber length, Cable couplers, Maximum cable length

DCN Wireless Installation and User Instructions System Design and Planning

en 24

3.6.3Optical 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.

3.6.4Cable 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.

3.6.5Maximum 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:

1Find the number of nodes of each device from the node value table (refer to table 3.1). Add together the

nodes of all devices.

2With the value of step 1, use the graph (refer to figure 3.2) to find the maximum cable length without LBB4414/10 Fiber Interfaces.

3Count the number of LBB4414/10 Fiber Interfaces. Each fiber interface decreases the maximum cable length from step 2 with 18 m.

	2150
	2050
	1950
	1850
	1750
(m)	1650
	1550
length
	1450
cable	1350
	1250
Max.
	1150
	1050
	950
	0	5	10	15	20	25	30	35	40	45	50	55	60	63
							Nodes

figure 3.2: Cable correction graph

Bosch Security Systems 2007-02 9922 141 70691 en