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Structuring the SDC 8000 system
40
Expansion stage (3): several central units with up to 900 consoles
For larger conference and interpretation systems with up to 900 consoles,
you can interconnect a total of 10 central units. The additional central
units are connected as “slaves” to the central unit configured as “master”.
If the conference and interpretation system is to be PC controlled, the PC
must be connected to the “master” central unit.
To set up a conference system with several central units, you first have to
interconnect the consoles in cable strings and then connect the cable
strings to the central units. Finally, you interconnect the central units (see
“Interconnecting several central units” on page 48).
The distance between a central unit and the first console of a cable string
must not exceed 100 m. The maximum length of the system cables used
for interconnecting the central units must not exceed 3 m.
Determining maximum cable lengths
In the preceding examples, the standard length of “3 m” is always given
for the system cables between the conference consoles. However, it is no
problem to use other cable lengths or cables of differing lengths within the
same string.
However, if you want to use longer cables, make sure that all consoles –
including the last one in a string – are supplied with a voltage of at least
30 V!
≤ 1
0
0
m
3 m
3 m
1
1
23
...
15
3 m
3 m
23
...
15
23
15
3 m
3 m
123
...
15
3 m
3 m
...
...
...
...
...
<=3 m
1
2
...
...
...
...
...
...
3
...
...
...
...
...
...
RS 232
<= 3 m
4
...
...
...
...
...
...
≤ 100 m
<=3 m
<=3 m