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Bosch Security Systems | 2007-02 | 9922 141 70691 en
DCN Wireless | Installation and User Instructions | System Design and Planning en | 14
2DCN design
2.1 Introduction
The DCN Wireless has three parts: the wireless
network, the DCN and the optical network. This
chapter tells how to design the DCN.
2.2 Calculation tool
The calculation tool makes the planning and design of
the DCN easier. You can find the calculation tool on the
CD-ROM that is supplied with your system.
2.3 Concepts
2.3.1 Introduction
This section gives necessary data to understand the
limitations in section 2.4.
2.3.2 Trunk and tap-off sockets
The DCN uses two types of socket:
• DCN trunk sockets
Use the DCN trunk sockets to make a loop-through
in the trunk of the DCN.
• DCN tap-off sockets
Use the DCN tap-off sockets to make more branches
in the DCN. A DCN tap-off socket always
regenerates the digital DCN signal.
2.3.3 Cables
Many devices used in the DCN have a 2 m cable. If
necessary the extension cable (LBB4116) can extend the
device cables.
2.4 Limits
Make sure that these limits are not exceeded when you
design the DCN:
Limit 1: Control capacity
The maximum number of active devices that the central
control unit can control is 95:
• Max. 93x DCN-IDESK
• Max. 2x DCN-DDI:
• 1x with intercom handset
• 1x with ambient microphone
The number of passive devices is without limit (refer to
section 2.5).
Limit 2: Power capacity
• The maximum power that one DCN socket of the
central control unit can supply is 65 W.
• The total power that the DCN sockets of the central
control unit can supply is 130 W.
• The maximum power that one DCN socket of the
extension power supply can supply is 85 W
• The total power that the DCN sockets of the
extension power supply can supply is 255 W.
Refer to section 2.6.
Limit 3: Loop-throughs
The maximum number of loop-throughs in succession is
50. If there are more than 50 loop-throughs, the signal
must be regenerated with a trunk splitter (LBB4114/00).
Limit 4: Tap-off connections
The maximum number of tap-off connections in
succession between the central control unit and the last
tap-off in a branch is four. If there are more than four
tap-off connections in succession, the system does not
operate correctly.