The Leader LT4448 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. A single LT4448 has 11 BNC channels and 3 LTC channels. These channels can receive SDI,NTSC/PAL black burst, HD tri-level sync, AES/EBU digital audio, word-clock signals, and LTC signals. SDI signals are switched with relays; all other signals are switched with electronic switches. The LT4448 has redundant power supplies. Alarms are generated when errors occur.
The LT4448 is used in combination with the LT4610/LT4611 (SYNC GENERATOR) or the LT4600A(MULTIFORMAT VIDEO GENERATOR).
Input / Output
Provides 11 channels (a single channel consists of a primary input, a backup input, and an output) on a single LT4448.
Input Signal Switching
Relays are used to switch channels 1 and 2. Electronic switches are used to switch channels 3 to 11. In addition to the electronic switches, channels 3 to 11 are also equipped with high-speed, error detection circuits. The LT4448 provides 3 channels of LTC.
Input Signal Selection
Channel 1 and 2 inputs are dedicated inputs for SDI (3G/HD/SD), NTSC/PAL Black burst and Tri-Level Sync signals. Channel 3 to 8 inputs are dedicated inputs for NTSC/PAL Black burst and Tri-Level Sync signals. Channel 9 and 10 inputs are dedicated inputs for AES/EBU digital audio signals. Channel 11 input is a dedicated input for word-clock signals (TTL). For LTC signals, dedicated LTC inputs / outputs (2Vp-p,differencial input) are provided.
LTC Channel
There are 3 LTC channels. Each has 2 inputs (primary, backup) and 1 output. In addition, the LT4448 can be connected to the LT4610 (SYNC GENERATOR) with a dedicated cable (optional).
Fault detection
When an input signal level error is detected, the panel fault LED on the LT4448 illuminates as well as the panel LED that indicates the channel which is causing the problem. This feature allows for quick notification of the error. Channels 3 to 11 are equipped with highspeed fault detection circuits. When interruptions occur in the primary signal, these enable the LT4448 to switch to a backup signal with barely any noticeable disturbances showing on a monitor.
Power Supply Start Time
A delay for starting the fault detection at power up can be set to approximately 1 minute or approximately 4 minutes, depending on the rise time of the system signal source that the LT4448 is connected to.
SNMP Ready
Error monitoring over an Ethernet network is possible. Traps are issued for error detection, panel control, and remote control. In addition, the error details and DIP switch settings (except for the user defined fault detection level) can be read as status information. IP address configuration software is included. (Windows 8 , Windows 10)
Redundant Power Supply
Redundant power supply provides extra reliability. Alarms are generated when an error occurs.
Web Browser
The LT4448 can be controlled by a web browser.