2. SPECIFICATIONS
5
2. SPECIFICATIONS
2.1 Description
The LT 4440/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 4440/LT 444,
and the LT 4440/LT 444 detects errors on the amplitude of the primary input signal. A
single LT 4440/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 4440/LT 444 indicates the channel that caused the problem
on the panel LED.
The LT 4440 is a short version of the LT 444 with a depth of 400 mm. You can set up a
backup system by combining the LT 4440 with the LT 443D or the LT 4400 Multiformat
Video Generator.
2.2 Features
●
Input/Output
Provides 11 channels (a single channel consists of PRIMARY input, BACKUP input,
and OUTPUT output) on a single LT 4440/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 4440/LT 444 illuminates the error LED
on the panel as well as the panel LED that indicates the channel causing the
problem. This feature allows quick investigation of the problem.
●
System
Configuration
Because the LT 4440 has the same depth as the LT 4400, you can configure a 2U
backup system by combining the LT4440 with the LT4400.
