HRS-HB-9
S
UPPORT
M
ODULE
H
ANDBOOK
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The diagrams above shows the difference between DC path options offered.
Splitter with no DC path: All RF ports are DC open circuit
Unswitched DC path: All ports are permanently DC shorted, any DC voltage on one port is available on the others
Switched DC path: The common port is DC connected to one of the output ports dependent on the card configuration, see section 3.1.3
Modules can work with voltages up to 20V and currents up to 0.8A. Unswitched version should be chosen only if DC voltage on all three
ports should be the same. If devices connected to ports S1 and S2 require different voltage or different tone frequency the splitter with
switched DC path should be used.
Note that for the purpose of this manual a
term ‘DC path’ means path for low frequency signals from DC to approx. 50 kHz.
Splitter with switched DC path, module configuration
3.1.3
The mode in which the RF splitter operates is USER configurable. You can change this by using the
ViaLiteHD
SNMP and Web controller
module. The DEFAULT configuration in which all units are delivered is PREFERRED LEFT. Below is a list of the available modes.
PREFERRED LEFT
– The COMMON is DC connected to the LEFT hand unit, if this unit alarms, it will switch to the RIGHT hand unit.
PREFERRED RIGHT
– The COMMON is DC connected to the RIGHT hand unit, if this unit alarms, it will switch to the LEFT hand unit.
FORCED LEFT
– The COMMON is DC connected to the LEFT irrespective of alarm status.
FORCED RIGHT
– The COMMON is DC connected to the RIGHT irrespective of alarm status.
Note that this is relevant ONLY for DC. RF port behaviour cannot be configured.
Splitter, DC path protection
3.1.4
The DC paths of the splitter are protected from over current with a fuse fitted to each DC output path, these protect the passive components
from over stress and permanent damage.
The fuses are fast acting “blow once” fuses; these fuses will only fail under gross fault conditions.
The fuse is replaceable
– access to the fuse is from the bottom of the module. Contact
ViaLite Communications
for more details. The
modules are protected as follows.
Splitter with no DC path: No fuse fitted, not required
Unswitched DC path: L-Band HTS, no fuse fitted, DC components will be protected by other system components in standard
configurations.
Unswitched DC path: Other bands, fuse fitted
Switched DC path: Fuse fitted
Position of fuses on rear of splitter modules, plug in and yellow link
RF splitter, no DC path
RF splitter with
unswitched DC path
RF splitter with
switched DC path
C
o
mm
o
n
C
o
mm
o
n
C
o
mm
o
n
S1
S1
S1
LEFT
S2
S2
S2
RIGHT
Fuse F9, port A
Fuse F10, port C