LT 444 CHANGEOVER

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The LT 444 is a changeover unit that switches to the backup system when accidents occur.

The LT 444 is a changeover unit that automatically switches the signal from the primary signal to the backup signal when problems are detected in the primary signal. Two systems of input signals (primary and backup) are connected to the LT 444, and the LT 444 detects errors on the amplitude of the primary input signal.
A single LT 444 provides 11 channels. HD-SDI (channels 1 to 6 only), SD-SDI, AES/EBU digital audio, analog black burst signal, and tri-level sync signals are supported through the configuration of the internal switch.
If a switch occurs from the primary signal to the backup signal, the LT 444 indicates the channel that caused the problem on the LED front panel.
The LT 444 can be configured in the system with the LT 443D.

• Input/Output
  Provides 11 channels (a single channel consists of PRIMARY input, BACKUP input, and OUTPUT output) on a single LT 444.
• Delay for Starting the Monitor
  The delay for starting the error monitor at power up can be set to FAST or SLOW depending on the rise time of the system signal source being connected.
• Determination Criteria of the Signal Level
  The internal preset switch allows level detection switching among SD-SDI, AES/EBU digital audio, NTSC or PAL analog black burst, HD analog tri-level sync, HD-SDI (only supported on channels 1 to 6), and other signals.
• Error Display
  When a signal level error is detected, the LT 444 illuminates the error LED on the panel as well as the LED panel that indicates the channel causing the problem. This feature allows quick investigation of the problem.