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LBB 3500/35, LBB 3500/35D*
Multi Central Control Unit
• Extends congress systems by up to 240 contribution units
• Can be used in single or multi-CCU mode
• Direct PC control facility
• Two RS-232 ports for direct PC control
*Note: Type numbers with a ‘D’ are intended for the
North American market. They are CSA/UL approved,
and have a modified mains supply and supply cord.
The LBB 3500/35 is functionally identical to the
LBB 3500/15 Central Control Unit (CCU), and is used
to extend the capacity of the DCN system. This unit is
designed for situations where more than 240 contribu-
tion units are required. Multi-CCU systems are con-
trolled from a separate, dedicated PC running the
Multi-CCU software (LBB 3586) and equipped with the
LBB 3511/00 PC Card. All Multi-CCU units and the
LBB 3511/00 PC Card are interconnected via a closed
loop coaxial cable.
Each subsequent Multi-CCU that is added increases
system capacity by a further 240, if future expansion is
anticipated. If the current number of contribution units
is less than 240, the LBB 3500/35 can be used in single-
CCU mode and functions as a LBB 3500/15 CCU. The
operating mode is altered by means of a front panel
switch. This flexibility means it can cater for virtually
every conference requirement.
The DCN control PC is connected to the master CCU
PC (running OS/2) via their respective serial ports.
Note: Additional operator equipment is required to con-
nect the Intercom Handset and Cradle (LBB 3555/00),
and headphones for monitoring audio channels.
When used in single-CCU mode, the functionality of
the LBB 3500/35 is identical to the LBB 3500/15 Central
Control Unit (CCU). When used in multi-CCU mode,
specific functions include:
DCN Data Brochure
| DCN Central Control Equipment | 57
• Up to 16 Multi-CCUs can be interconnected, allowing up to
3840 contribution units to be connected to the DCN system
(when used with the Delegate Database software module
(LBB 3580), the maximum number of contribution units is 1500)
• Can operate single or in Multi-CCU mode
• Built-in power supply unit to supply both the Multi-CCU and
externally-connected DCN equipment. Up to 180 units of
PCF 1 can be driven per CCU
• Control facilities for up to 240 contribution units per CCU
• Automatic audio equaliser for adjusting the frequency
response of contribution unit loudspeaker channels per CCU
• Two basic microphone operational modes are available:
- ‘OPEN’: microphone-key control with request-to-speak
registration
- ‘OVERRIDE’: microphone-key control with override of
already-active microphones (FIFO)
• Each microphone operation mode allows one, two or four
microphones to be simultaneously active
• Basic parliamentary voting control facilities. Delegates can
register ‘PRESENT’, ‘FOR’, ‘AGAINST’ and ‘ABSTAIN’. The
total results can also be displayed on hall displays and on
contribution unit LCD screens
• Basic simultaneous interpretation functions with as many as
11 interpretation channels plus the floor language
• Extended facilities are available if the Multi-CCU is connect-
ed to a PC running DCN software. For more details on the
software available, please refer to chapter 5 (Application
Software)
• Camera control or remote control via serial communication
with master CCU PC
Controls and indicators
• Mains on/off switch with green LED indicator
• ‘Active Microphone’ button with three yellow LED indicators
to select the maximum number of delegate microphones
which may be active simultaneously (one, two, or four) in
stand-alone systems
• ‘Microphone Mode’ button with three yellow LED indicators
to select microphone operating mode(OPEN, OVERRIDE
OR VOICE) in single-CCU systems
• Equalizer button with 2 LED indicators to indicate ON (green
LED) or BUSY (red LED) plus a switch for automatic audio
equalizer adjustment
• Rotary loudspeaker tone controls for bass and treble adjust-
ment
• Rotary loudspeaker volume control
• Switch to select single or Multi-CCU operating mode, with
error indication (only when operating in the single [stand-
alone] mode)
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