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Bosch Security Systems | 04-2003 | 3922 988 43318 en
Digital Congress Network | Installation and Operating Manual | Chapter 13 - Technical Data
en | 13-11
System limitations
13.6 System limitations
1. The maximum length of cable (including the 2 m cable attached to the DCN system units) that
can be connected to a tap-off outlet of a Central Control Unit LBB 3500/.., Audio Media Interface
Unit LBB 3508/00 and Extension Power Supply LBB 4106/00 must not exceed 100 m.
2. The cable length between the Central Control Unit and the last unit in any system installation
must not exceed 250 m. This includes all extension cables used as well as the 2 m long cable
attached to each system unit.
3. The maximum number of serial tap-off outlet connections from the Central Control Unit LBB
3500/.. to the last tap-off in its chain should not exceed four.
Tap-off outlets are available on the Extension Power Supply Unit LBB 4106/00, Audio Media Inter-
face Unit LBB 3508/00, Trunk-cable splitter LBB 4114/00, and Tap-off unit LBB 4115/00.
4. The maximum number of units that can be connected in series, via the trunk outlet loop-through
connector, is 60 Units (i.e. units assigned a PCF value of 1) also include, the delegate, chairman
and interpreter desks, Dual Audio Interface Unit LBB 3535/00 and the Multi-purpose Connection
Unit LBB 3540/15 and trunksplitter LBB 4114/00.
13.7 Connection details
13.7.1 Mains cable
The wires in the mains cable are coloured in accordance with the following code:
Blue Neutral
Brown Live
Green/yellow Earth/Ground
13.7.2 DCN circular connectors
PIN 1 Down-link screen
PIN 2 Down-link signal
PIN 3 < +40 V
PIN 4 Up-link signal
PIN 5 Up-link screen
PIN 6 < +40 V
13.7.3 Cable connection
3-pole XLR connector (female)
PIN 1 Earth
PIN 2 Signal +
PIN 3 Signal -
13.7.4 Pluggable microphones
LBB 3549/xx
5-pole XLR connector (male)
PIN 1 lightring control (active low)
PIN 2 lightring +5V
PIN 3 microphone signal
PIN 4 electrical ground
PIN 5 shield
1
6
2
3
4
5 5
6
4
3
2
1
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3
1
4
3
2
3
5