User's Manual
Table Of Contents
- 1 System Overview
- 2 Features Summary
- 3 EXACT-V2 Rack
- 3.1 EXACT-V2 mechanics
- 3.2 Interface characteristics
- 3.3 Front Panel signalization (LEDs description)
- 3.4 Power requirements
- 3.5 Performances and technical characteristics
- 3.5.1 General characteristics
- 3.5.2 Control and data Ethernet interfaces
- 3.5.3 Serial control interfaces
- 3.5.4 ASI inputs / output and MPEG-TS processing
- 3.5.5 Digital modulation
- 3.5.6 Clock synchronization
- 3.5.7 RF and monitoring outputs
- 3.5.8 Digital precorrection
- 3.5.9 Power level measurement inputs and AGC
- 3.5.10 Dry contacts
- 3.6 Conformity with EC Directive
- 4 EXACT-V2 Installation
- 5 Operation
- 6 Maintenance & Troubleshooting
- Appendix A GPS Installation Recommendations
- Appendix B Example of GPS Antenna
USER
MANUAL
MPD-1611291-A
EXACT-V2 High End Rack Modulator / Exciter
3/10/2017
MPD-1611291-A
Page 18/94
2.3.1 TS CleverSwitch Control
CleverSwitch is a flexible input redundancy management mechanism designed by
Hitachi-Comark. It is enabled by default and can be manually disabled or enabled.
Figure 2: TS CleverSwitch block diagram
CleverSwitch is based on a programmable consecutive error threshold. Once it is
reached, the stream selection switches automatically from the primary input to the
secondary. When the valid packets threshold is reached, the stream input switches
back to the primary. In 188 byte format, the switch criteria only considers the number
of consecutive valid and error packets (0x47 sync detection), whereas in 204 byte
mode, it also uses the RS errors. The switch decision is implemented only on the
primary input. The switch-back is manual or automatic in case of secondary signal
failure.