Technical data

7.9 System Limits
• The total DCN cable length (using standard
LBB 4116/xx cable) between the central control unit
and the last unit in any branch of the system must not
exceed 250 m (820 ft 2 in). This includes all extension
cables and the 2 m (78.74 in) long cable attached to
each system unit
• The total number of units from the central control
LBB 4100/00 unit to the first regenerative tap-off (i.e.,
from Trunk Cable Splitter LBB 4114/00 or Extension
Power Supply Unit LBB 4106/00) must not exceed
50 pieces (100 m [328 ft 1 in])
• The total length of the extension cable between regen-
erative tap-offs outputs must not exceed 100 m (328 ft
1 in)
• The maximum distance between units is normally
160 cm (62.99 in). This distance can be increased by
using the LBB 4116/xx Extension Cable
• The total Plastic Optical Fiber (POF) length (using
standard LBB 4416/xx cable) between two units is 50 m.
When more than 50 and less than 1500 meter is
required, fiber interfaces LBB 4414/00 and Glass
Optical Fiber (GOF) must be used. Only multimode
GOF with a maximum attenuation of 2 dB/km and a
wavelength of 1300 and terminated with SC connectors
is supported.
It is also possible to increase the 50 m by inserting a
network splitter LBB 4410/00 every 50 m or less.
• The maximum length of all optical fibers together (POF
& GOF) depends on the number of nodes in the sys-
tem. The graph below shows the relation between the
number of nodes and the fiber lengths.
Examples
The examples given below of the LBB 4100/00,
LBB 4106/00 show the following:
• Maximum number of units that can be connected to a
single output
• Maximum number of units that can be connected to all
outputs
• Maximum DCN cable length from an output to the last
unit
In these examples, the following annotations are used:
ID = Interpreter desks
CS = Channel selectors
AEX =Audio Expander
It can be seen by the maximum number given for each
type of unit that a Channel Selector requires less power
than a Interpreter desk, and therefore more Channel
Selectors can be connected to central control equipment.
Interpreter desks require more power than the Channel
Selectors.
28 | Technical Data | DCN Next Generation Interpretation System Data Brochure
OK Fail
Fault
RS 232
Network
12
Audio In 1 Audio Out 1 Audio In 2 Audio Out 2
Mains
Port 2
115: 100-120V 50-60Hz T2.5A 250V
230: 220-240V 50-60Hz
T2A H 250V
RS 232 Port 1
Trunk
12
Avis
Caution
Risk of electric shock.
Do not open.
Risk of electric shock.
Do not open.
230
<= 18 pieces
<= 50 pieces
LBB 4100
<= 11 pieces
<= 0 AEX + 100 CS
<= 0 AEX + 36 ID
<= 11 AEX + 18 ID
<= 11AEX + 50 CS
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
OutOutOutIn
Tap-offTrunk
LB B 410 6
<= 24 ID
<= 50 CS
<= 150 CS
<= 72 ID
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
Floor
a
b
c
de AB
Auto-relay
Micro Mute
Engaged
Phone
Intercom
Help
Slow
Chair
Call
2150
2050
1950
1850
1750
1650
1550
1450
1350
1250
1150
1050
950
0 5 10 15 2 0 25
Number of nodes
30 35 40 45 50 55 60 65
Maximum cable lenght (m)