Appear TV SC2000 - High Performance Dual Decoder with RF Modulation and Stereo Sound

SW Version 2.04 30-January-2009 Page 9 of 128
In addition to the RF output described in section 3.4.5.1, the module has a female
DSUB9 interface connector that can be used for controlling redundancy switching. If a
critical alarm is detected, the DSUB9 interface will go from OK state to ALARM state
after a set period and the built in relay will change its pin configuration according to
the following table:
Pin 1-6 open
OK
Pin 2-6 closed
Pin 1-6 closed
Channel A
ALARM
Pin 2-6 open
Pin 5-9 open
OK
Pin 4-9 closed
Pin 5-9 closed
Channel B
ALARM
Pin 4-9 open
Table 1 - Alarm relay states.
In order to avoid unnecessary switching on the output, a hysteresis scheme has been
implemented.
If the initial relay state is OK and a critical alarm condition is detected for more than 5
seconds, the relay state will signal an ALARM condition, and the DSUB9 interface
configuration will change according to Error! Reference source not found..
If the initial relay state is ALARM and all critical alarm conditions are cleared for at
least 60 seconds the relay state will go back to OK, and the DSUB9 interface
configuration will change according to Error! Reference source not found..
The RF output can be muted by an eternal system by applying 5 V to the mute
connector. Channel A and channel B can be muted individually. The Dual Decoder
with RF Modulation and Stereo Sound is 3 slots wide.
3.4.5.3 High Performance Dual Decoder with RF Modulation and
Stereo sound
The High Performance Dual Decoder Module will provide the same output as the
standard RF up converter, but with improved RF specifications. The RF up-converted
output for the two channels are combined internally and presented on a single female
F-connector.
The module has a test output with both channels. The test output connector is a
single female F-connector and the power level is -23 dB from the main output.
The module covers the complete VHF/UHF band from 47 MHz to 862 MHz and NICAM
or A2 stereo is provided as a SW option. A module delivered as mono can later be
upgraded to support NICAM or A2 stereo by purchasing a SW licences.
The RF output can be muted by an external unit by applying 5 V to the mute
connector. Channel A and channel B can be muted individually. The High Performance
Dual Decoder with RF Modulation and Stereo sound is 2 slots wide.
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