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Bosch Security Systems | 04-2003 | 3922 988 43318 en
Digital Congress Network | Installation and Operating Manual | Chapter 10 - Installation Techniques
en | 10-5
Trunk outlets and Tap-offs
10.3.2 Using Tap-Off unit LBB 4115/00
The Tap-off unit LBB 4115/00 (FIG 10-5) provides short-circuit protection on the Tap-off connector.
Each tap-off connector can accommodate up to a maximum of 2.5 PCF including a DCN units
extension cable; for example:
• Table-top units
- 2 x Concentus Delegate, Chairman units or Interpreter Desks
• Flush mounted units
-1 x Dual Audio Interface unit
or 1 x Multi-purpose connection unit
or 5 x Channel selector units.
NOTE: The Tap-off connector can handle up to 2.5 PCF per outlet (1x Concentus unit per tap-off)
FIG 10-5 LBB 4115/00 Tap-off unit limitations
10.3.3 Maximum cable lengths using Trunk-outlets and/or Tap-offs
Extension cables are used to extend the length of cable on DCN system units. The length of cable
used, directly affects the PCF value of a system.
System limits (FIG 10-6)
1. The total cable length (using standard LBB 4116/xx cable) between the CCU and the last unit in
any branch of the system must not exceed 250 m (820 ft.). This includes all extension cables and
the 2 m (6.5 ft.) cable attached to each system unit.
2. The total length of the cable from the CCU to the first regenerative tap-off (i.e. from Trunk Cable
Splitter LBB 4114/00, Audio Media Interface Unit LBB 3508/00 or Extension Power Supply Unit
LBB 4106/00 must not exceed 100 m (328 ft.).
3. The total length of the cable between regenerative tap-offs outputs must not exceed 100 m
(328 ft.).
FIG 10-6 Maximum cable lengths
Termination plug LBB 4118/00
(for use with Channel selector panels LBB 3524/10 and LBB 3526/10)
LBB 4115/00
Trunk-line
Trunk-line
Tap-offs
see Note
Trunk-line
Trunk-line
LBB 4115/00
Tap-offs
Port 1
Rec.
Line
In
Out
In
Out
Symmetrical
Trunk
115 V-T4A 230V -T2A
Tap-off outlet
Tap-off outlet
Trunk outlet
Max. cable length = <100 m (328 ft.)
Max. cable length = <100 m (328 ft.)
Max. cable length = <50 m (164 ft.)
Tap-off outlet
Max. cable
length =
< 100 m
(328 ft.)
Max. cable
length =
< 100 m
(328 ft.)
Trunk-line
LBB 3500/xx
Regenerative
tap-off
LBB 4114
LBB 3508
LBB 4106
Regenerative
tap-off
LBB 4114
LBB 3508
LBB 4106