DMDVB20 LBST Satellite Modem
Theory of Operation
TM138 – Rev. 1.0
3-7
Mod Fault:
De-energized when any transmit side fault is detected.
Demod Fault:
De-energized when any receive side fault is detected.
Common Fault:
De-energized when any fault that is not explicitly a Tx or
Rx Fault such as an M&C or Power Supply Fault.
Open Collector Faults:
The UIM provides two Open Collector Faults that appear at Pins 18 & 21 on J19.
Mod Fault:
Will sink up to 20 ma (maximum) until a transmit or
common fault is detected. Will not sink current if a fault
is detected.
Demod Fault:
Will sink up to 20 ma (maximum) until a receive or
common fault is detected. Will not sink current if a fault
is detected.
The open collector faults are intended for use in redundancy switch applications in order to
provide quick status indications.
3.3 Internal Clock
The time and date is kept in order to ‘time-tag’ system events. User can change the Internal
Clock via the front panel or Terminal ports.
Summary of Contents for DMDVB20 LBST
Page 11: ...Table of Contents DMDVB20 LBST Satellite Modem xii TM138 Rev 1 0...
Page 14: ...DMDVB20 LBST Satellite Modem Introduction TM138 Rev 1 0 1 3...
Page 20: ...Installation DMDVB20 LBST Satellite Modem 2 6 TM138 Rev 1 0...
Page 36: ...Theory of Operation DMDVB20 LBST Satellite Modem 3 16 TM138 Rev 1 0...
Page 67: ...DMDVB20 LBST Satellite Modem User Interfaces TM138 Rev 1 0 4 31...
Page 73: ...Rear Panel Interfaces DMDVB20 LBST Satellite Modem 5 6 TM138 Rev 1 0...
Page 79: ...Maintenance and Troubleshooting DMDVB20 LBST Satellite Modem 6 6 TM138 Rev 1 0...
Page 88: ...DMDVB20 LBST Satellite Modem Technical Specifications TM138 Rev 1 0 7 9...
Page 90: ...Appendix A DMDVB20 LBST Satellite Modem A 2 TM138 Rev 1 0...
Page 97: ...DMDVB20 LBST Satellite Modem Appendix B TM138 Rev 1 0 B 7...
Page 100: ...DMDVB20 LBST Satellite Modem Appendix C TM138 Rev 1 0 C 3...
Page 107: ...DMDVB20 LBST Satellite Modem Appendix D TM138 Rev 1 0 D 7...
