Leader LT 4448 3G-SDI Auto Changeover Unit for LT4610 Generator
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Leader LT 4448 3G-SDI Auto Changeover Unit for LT4610 Generator

SKU: LDLT4448 MFR: LT4448
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Key Features

  • Ensure seamless signal redundancy with the LT 4448 3G-SDI auto changeover unit.
  • Maintain signal integrity with automatic switching for critical broadcast applications.
  • Remotely monitor and control via Ethernet; supports SNMP & web browser interfaces.
  • Detect signal faults quickly with LED indicators for efficient troubleshooting.
  • Versatile connectivity: Supports 3G-SDI, HD-SDI, SD-SDI, and AES/EBU digital audio.
  • Integrate easily into existing systems with comprehensive remote control capabilities.
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Special Order?Estimated to Ship: 09/05/2025
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Leader LT4448 Specifications

Compliant Standards

Compliant Standards

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  • SDI Signal

    3G-SDI: SMPTE ST 372, SMPTE ST 424, SMPTE ST 425
    HD-SDI (including HD dual link): SMPTE ST 274, SMPTE ST 292, SMPTE ST 296
    SD-SDI: SMPTE ST 125, SMPTE ST 259

  • Sync Signal

    NTSC Black Burst Signal: SMPTE ST 170, SMPTE ST 318, SMPTE RP 154
    PAL Black Burst Signal: ITU-R BT.1700, EBU N14
    HD Tri-Level Sync Signal: SMPTE ST 274, SMPTE ST 296

  • AES/EBU Digital Audio Signal

    AES3, SMPTE ST 276

  • LTC Signal

    SMPTE 12M-1

I/O Connectors

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  • Primary Input Connectors

    Ch1 to 10: 10 input connectors (75 Ohm BNC connectors)
    Ch11: 1 input connector (TTL, 75 Ohm BNC connector)

  • Backup Input Connectors

    Ch1 to 10: 10 input connectors (75 Ohm BNC connectors)
    Ch11: 1 input connector (TTL, 75 Ohm BNC connector)

  • Output Connectors

    Ch1 to 10: 10 output connectors (75 Ohm BNC connectors)
    Ch11: 1 output connector (+5 V CMOS, 75 Ohm BNC connector)

  • LTC Connectors

    Connector: 25-pin D-sub (input and output shared)
    Number of Inputs: 3 systems each 2 inputs (Primary, Backup)
    Number of Outputs: 3 systems 1 output (Output)

I/O Characteristics

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  • Ch1 and 2 (typical)

    Return Loss: 30 dB (0 to 10 MHz)
    15 dB (10 MHz to 1.5 GHz)
    10 dB (1.5 to 3 GHz)

    Insertion Loss: 0.2 dB (0 to 10 MHz)
    0.5 dB (10 to 500 MHz)
    2.0 dB (1.5 to 3 GHz)

    Crosstalk: -60 dB (0 to 10 MHz)
    -48 dB (10 MHz to 1.5 GHz)
    -40 dB (1.5 to 3 GHz)

    Impedance: External termination
    Maximum Input Voltage: +/-5V

  • Ch3 to 10

    Return Loss: 30 dB (0 to 10 MHz, internally terminated)
    Insertion Loss: 0.3 dB (0 to 10 MHz)

    Crosstalk: -55 dB (0 to 10 MHz)
    -45 dB (10 to 30 MHz)
    Input Impedance: 75 Ohm
    Output Impedance: 75 Ohm
    Maximum Input Voltage: +/-1.5V

  • Ch11

    Input Impedance Approx: 4 k Ohm
    Output Impedance Approx: 60 Ohm
    Maximum Input Voltage: 0V/+5V (TTL)

  • LTC

    Input Impedance: 10 k Ohm balanced
    Input Signal Level: 0.5 to 4Vp-p
    Output Impedance: 600 Ohm balanced
    Output Signal Level: 2Vp-p +/-10%
    Number of input channels: LTC1, LTC2, LTC3 (3 channel inputs)
    Number of output channels: LTC1, LTC2, LTC3 (3 channel outputs)

  • GPI (LTC connector shared)

    LT 4610 alarm outputs:

    Number of Inputs: Primary, Backup, 1 each
    Number of Outputs: Primary, Backup, 1 each
    Output method: Through
    Output Signal Level: 5V CMOS

Input Signals

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  • Setting Method

    Select the input signal type for each channel with DIP switches or external control.

  • Ch1 and 2

    NTSC black burst signal
    PAL black burst signal
    HD tri-level sync signal
    SD-SDI signal (270 Mb/s)
    HD-SDI signal (1.485 Gb/s)
    3G-SDI signal (2.97 Gb/s)

  • Ch3 to 8

    NTSC black burst signal
    PAL black burst signal
    HD tri-level sync signal

  • Ch9 and 10

    AES/EBU Digital Audio Signal

  • Ch11

    Word-clock Signal (TTL)

  • LTC

    LTC Signal

Signal Switching

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  • Switching Method

    Ch1 and 2: Relays
    Ch3 to 11, LTC: Electrical switches

  • Switch Time of the Relay

    Ch1 and 2: 2 ms or less

  • High-speed Switch Time

    Ch3 to 11, LTC: 100 ns or less

  • Switch Time due to Fault Detection

    Ch1, 2 and LTC: 70 ms or less

    Ch3 to 8:
    High-Speed Detection: 1.5 H or less
    Low-Speed Detection: 60 ms or less

    Ch9 and 10:
    High-Speed Detection: 6 us or less
    Low-Speed Detection: 60 ms or less

    Ch11:
    High-Speed Detection: 60 us or less
    Low-Speed Detection: 60 ms or less

Fault Detection

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  • Fault Indication

    Indicates with LEDs the problematic signal system (PRIMARY or BACKUP) if a fault is detected

  • Fault Channel Indication

    Indicates with LEDs the problematic channels
    when a fault is detected

  • DC Offset

    +/-30 mV (sync signal only)

  • High-Speed Detection

    Detects a fault when a signal drops out

  • Low-Speed Detection

    Detects a fault when a signal level falls below the detection level

  • Detection Level

    2 to 5 dB below the specified level

  • Detection Reference

    Ch1 to 11: Select LOW, HIGH or user-defined level with DIP switches for each input signal type

    Low Level:
    NTSC Black Burst Signal: -180 to -227 mV (-286 mV)
    PAL Black Burst Signal: -190 to -238 mV (-300 mV)
    HD Tri-Level Sync Signal: 337 to 476 mV (600 mV)
    SD-SDI signal (270 Mb/s): 450 to 635 mV (800 mV)
    HD-SDI signal (1.485 Gb/s): 450 to 635 mV (800 mV)

  • Detection Reference (Cont.)

    3G-SDI signal (2.97 Gb/s): 450 to 635 mV (800 mV)
    AES/EBU Digital Audio Signal: 631 to 794 mV (1000 mV)
    Word-clock signal: 1515 to 1907 mV (2400 mV)

    High level:
    NTSC Black Burst Signal: -210 to -264 mV (-286 mV)
    PAL Black Burst Signal: -220 to -277 mV (-300 mV)
    HD Tri-Level Sync Signal: 379 to 535 mV (600 mV)
    SD-SDI signal (270 Mb/s): 505 to 713 mV (800 mV)
    HD-SDI signal (1.485 Gb/s): 505 to 713 mV (800 mV)

  • Detection Reference (Contd..)

    3G-SDI signal (2.97 Gb/s): 505 to 713 mV (800 mV)
    AES/EBU Digital Audio Signal: 734 to 924 mV (1000 mV)
    Word-clock signal 1759 to 2215 mV (2400 mV)

    User-defined level:
    Ch1 to 8: -100 to -700 mV(when a signal that is equivalent to a horizontal sync signal is applied)
    Ch9 and 10: 100 to 1400 mV (p-p value of input signal)
    Ch11: 500 to 3000 mV (high level of input signal)

    LTC:
    Signal amplitude 300 mVp-p or less

  • Detection Reference (Contd...)

    Time from When the LT 4448 Turns On to When Error Detection Starts: Approx. 10 s (no delay) / Approx. 1 min. (60 to 80 s) / Approx. 2 min. (120 to 140 s) / approx. 4 min. (240 to 320 s)

Alarm Detection

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  • Alarm Indications

    Indicates with LEDs when errors are detected in output signals (channels 3 to 11), or power supply

  • Detection Setting

    On/Off

Key Lock

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  • Lock and Unlock

    Hold down the KEY LOCK key

  • Auto Key Lock

    Automatically locks the keys after 60 seconds of inactivity (no key operations)

External Control Connectors

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  • Remote Connector

    Use: Remote control
    Input: Sync Source, Auto Switching, Reset
    Output: Sync Source, Fault
    Connector: 9-pin D-sub (female)
    Locking Screws: #4-40" screws

  • Ethernet Port

    Use: Remote control and error monitoring from an external PC
    Compliant Standards: 10BASE-T/100BASE-TX auto switching

    Protocol:
    SNMP (SNMPv2c): Remote monitoring, alarm occurrence
    HTTP: Control through a browser

    Supported browsers:
    FireFox (latest)
    Google Chrome (latest)
    Microsoft Edge (latest)
    IE9 or later (IE9, IE10, IE11)

  • Ethernet Port

    Use: Remote control and error monitoring from an external PC
    Compliant Standards: 10BASE-T/100BASE-TX auto switching

    Protocol:
    SNMP (SNMPv2c): Remote monitoring, alarm occurrence
    HTTP: Control through a browser

    Supported browsers:
    FireFox (latest)
    Google Chrome (latest)
    Microsoft Edge (latest)
    IE9 or later (IE9, IE10, IE11)

  • USB Port

    Use: IP address configuration
    Compliant Standards: USB 2.0
    Connector: Type B

General

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  • Environmental Conditions

    Operating Temperature: 32 to 104 Degree F (0 to 40 Degree C)
    Operating Humidity Range: 90 %RH or less (no condensation)
    Optimal Temperature: 41 to 95 Degree F (5 to 35 Degree C)
    Optimal Humidity: 85 %RH or less (no condensation)
    Operating Environment: Indoors
    Elevation: Up to 2,000 m
    Overvoltage Category: II
    Pollution Degree: 2

  • Power Requirements

    Redundancy: Supported
    Voltage: 90 to 250 VAC
    Frequency: 50/60 Hz
    Power Consumption: 40W max

Physical

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  • Dimensions (W x H x D)

    16.7 x 1.7 x 15.7" (426 x 44 x 400mm) (excluding protrusions)

  • Weight

    8.8 lbs (4kg) (excluding rack support)

About Leader LT4448

If you're seeking a reliable solution for seamless signal management, the Leader LT 4448 3G-SDI Auto Changeover Unit is an ideal choice for use with the LT4610 Generator. This advanced changeover unit is designed to automatically switch from a primary signal to a backup signal whenever it detects issues in the primary input, ensuring uninterrupted signal flow. The LT 4448 is compatible with two LT 4600As and can be integrated with the LT 4610, LT 4611, and LT 4600A systems, making it a versatile addition to your setup.

Equipped with 11 pairs of BNC and LTC channels, the LT 4448 supports a wide range of input signals, including SDI, NTSC/PAL black burst, HD tri-level sync, AES/EBU digital audio, word-clock, and LTC signals. Each channel consists of a primary input, a backup input, and an output, providing comprehensive coverage for your signal management needs. Channels 1 and 2 utilize relays for switching, while channels 3 to 11 employ electronic switches complemented by high-speed error detection circuits, ensuring rapid response to any signal disruptions.

The LT 4448 offers dedicated input configurations: Channels 1 and 2 are tailored for SDI (3G/HD/SD), NTSC/PAL black burst, and tri-level sync signals. Channels 3 to 8 focus on NTSC/PAL black burst and tri-level sync signals, while channels 9 and 10 are dedicated to AES/EBU digital audio signals. Channel 11 is specifically designed for word-clock signals (TTL). Additionally, the unit provides three LTC channels, each with two inputs (primary and backup) and one output, featuring dedicated LTC inputs/outputs (2Vpp, differential input).

Fault detection is a key feature of the LT 4448, with a panel fault LED illuminating to indicate errors, alongside a channel-specific LED for quick identification. High-speed fault detection circuits in channels 3 to 11 facilitate swift switching to backup signals, minimizing any visible disturbances on connected monitors. The unit also offers configurable power supply start times, with options for approximately 1-minute or 4-minute delays, depending on the rise time of the connected system signal source.

For enhanced monitoring and control, the LT 4448 is SNMP-ready, allowing error monitoring over an Ethernet network. It issues traps for error detection, panel control, and remote control, with status information accessible via IP address configuration software compatible with Windows 8 and Windows 10. The unit's redundant power supply adds an extra layer of reliability, generating alarms in the event of errors. Furthermore, the LT 4448 can be conveniently managed through a web browser, providing a user-friendly interface for remote operation.

In summary, the Leader LT 4448 3G-SDI Auto Changeover Unit is a robust and versatile solution for maintaining signal integrity in professional audio and video environments. Its comprehensive features and compatibility with multiple systems make it an essential tool for ensuring seamless signal transitions and minimizing downtime.

Leader LT4448 Features

  • Supports SDI, NTSC/PAL black burst, HD sync, AES/EBU audio, LTC across 11 BNC/LTC channels
  • Channels 1-2: SDI/NTSC/PAL/HD sync; 3-8: NTSC/PAL/HD sync; 9-10: AES/EBU; 11: Word-clock
  • Channels 1-2 use relays for switching; Channels 3-11 use high-speed switches for redundancy
  • 3 LTC systems with 2 inputs (primary/backup) and 1 output; connects to LT 4610
  • Configurable delay for fault detection at power-up (1 or 4 minutes)

Warranty Information

This product has a limited warranty of 12 months.

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Key Features

  • Ensure seamless signal redundancy with the LT 4448 3G-SDI auto changeover unit.
  • Maintain signal integrity with automatic switching for critical broadcast applications.
  • Remotely monitor and control via Ethernet; supports SNMP & web browser interfaces.
  • Detect signal faults quickly with LED indicators for efficient troubleshooting.
  • Versatile connectivity: Supports 3G-SDI, HD-SDI, SD-SDI, and AES/EBU digital audio.
  • Integrate easily into existing systems with comprehensive remote control capabilities.

What's in the box:

  • Leader LT 4448 3G-SDI Auto Changeover Unit
  • 2x Power Cord
  • 2x Rack Supports
  • 4x Rack Support Mounting Screws
  • Software (CD-ROM)
  • Manual (CD-ROM)
  • Leader 1 Year Limited Warranty