• 4K
  • 12G SDI
  • 3G SDI
  • HD SDI
  • SD SDI
  • PTP

Stability/Multi-output/PTP Grandmaster
Hot-swappable redundant power supply

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The LT4670 is a 1U full rack size synchronous signal generator that outputs PTP, GNSS, (4K/HD) IP, 4K 12G, (3G/HD/SD) SDI, analog synchronous signals, AES/EBU, audio word clock and LTC synchronized to analog video sync signals.
The PTP operates as a grand master and has two independent PTP reader and follower functions. The PTP operates as a grand master and has two independent PTP reader functions and a PTP follower function.
Six independent analog sync signal outputs, digital audio output, word clock output, LTC input/output, and L-SYNC are provided as standard, with options for GNSS sync, PTP, 4K IP, HD IP, 4K 12G-SDI, 4K Quad, 3G-SDI, HD-SDI, and SD-SDI output in any pattern. The system is designed for optimal synchronization system management according to various systems.


  • Genlock Function
    NTSC/PAL black burst signals and HDTV tri-level sync signals, which are analog video sync signals, can be input to synchronize each output signal. NTSC/PAL black burst signals with field reference pulse and NTSC black burst signals with 10-field ID are also supported. It also supports 10 MHz CW lock as standard.
     * Additional options are required when using PTP or GNSS.
  • Stay-in-sync and slow lock functions
    A stay-in-sync function is provided in case of abnormalities in the genlock input. In addition, a slow-lock function is provided to reduce the shock that occurs when the genlock is performed again after a stay-in-sync, thus realizing an extremely stable synchronization system. The system supports BB, tri-level, 10 MHz CW, GNSS (SER01), and PTP (SER03).
  • Six independent analog video sync signal outputs
    Six independent analog video sync signal outputs are available. The phase of each output can be varied independently.
  • Word Clock Signal Output
    One 48 kHz word clock signal synchronized with the video signal can be output.
  • AES/EBU signal output
    One AES/EBU signal with tone and one muted AES/EBU signal can be output.
  • CW or 1PPS output
    Selectable 10MHz CW or 1PPS output.
  • Time code output
    Based on internal time information, NTP server, LTC (LTC terminal input), VITC (SER02), GNSS (SER01), and PTP (SER03) time information, output to 3 LTC (LTC terminal) systems, multiplex analog sync signal to VITC, and SDI (SER02/ SER04) output to ATC ( SDI (SER02/SER04) output can be multiplexed to ATC ( LTC/VITC).
  • GPIO pin
    Preset recall and alarm contacts can be output.
  • Synchronous control between devices (L-SYNC)
    In a redundant system, time can be synchronized by using L-SYNC to connect the main and backup devices synchronized by the same analog video sync signal. Synchronized time outputs are PTP (SER03), LTC, black signal (VITC), SDI signal ATC (VITC/LTC) (SER02/04), AES/EBU signal,NTP.
  • Ethernet
    Control by SNMP and issue TRAP for anomalies.
    It is also possible to control the instrument via HTTPS/HTTP and REST-API.
    It can be used as an NTP client to connect to an NTP server to set the internal clock time, or as an NTP server.
  • Preset and Memory Functions
    The last memory, which maintains the last setting when the power is turned off, and up to 10 presets can be stored internally. For operational convenience, registered presets can be recalled to always start up with the same settings.
  • Redundant power supply and non-stop power supply and fan replacement
    Redundant power supply unit option (LT4670SER11) can be added for redundant operation. The power supply unit and fans are hot-swappable.
  • Web browser
    By connecting the LT4670 to a PC, settings and monitoring can be performed via a web browser.


Independent PTP network

Example of independent PTP network usage

Setting up two systems as followers/leader and follower

Synchronous control between devices (L-SYNC)

Stay-in-sync and slow lock functions

Time output based on reference signal and time source

LED display function

Rear Panel

  • Hardware Options
    Option Product Name Function
    LT4670-SER01 GNSS GNSS (GPS, GLONASS, GALILEO, BDS) synchronization
    LT4670-SER02 SDI 3G/HD/SD-SDI 2 outputs
    LT4670-SER03 PTP Grand Master, Leader and Follower functions
    LT4670-SER04 25G IP 12G TSG 4 outputs 12G/3G/HD/SD SDI, IP 25G/10G pattern output
    LT4670-SER11 POWER Power supply unit
  • Software Options
    Option Product Name Function
    LT4670-SER21 4K 3G-Quad Link 4K 3G-Quad output
  • LT4670-SER01 | GNSS
    By adding the GNSS option  (LT4670SER01) and connecting a GPS antenna, signals can be generated and output by locking to the frequency and time obtained from GNSS (GPS, GLONASS, GALILEO, BDS).
  • LT4670-SER02 | SDI
    • SDI support for up to 4 outputs
      The LT4670-SER02 supports two 3G-SDI (Level A, Level B), HD-SDI, and SD-SDI signals, with two independent SDI signal output terminals, each with separate format, pattern, and phase settings. Two options can be installed to provide up to four SDI signal outputs with independent formats and patterns.
    • Lip-sync pattern (when SDI option is added)
      Outputs a lip-sync pattern in which video and audio are synchronized, allowing measurement of video and audio discrepancies in SDI signal transmission.
    • User pattern (with SDI option)
      Customer-created image files (BMP, TIF format) can be used as test patterns.
    • Embedded audio superimposition (when SDI option is added)
      16 channels (4 channels x 4 groups) of embedded audio can be superimposed. 
    • Time code pattern superimposed display (when SDI option is added)
      Time code can be superimposed at any position on the screen.
    • Freeze confirmation function (when SDI option is added)
      Scrolling pattern, moving box, ID character scrolling blinking, and circle blinking can be superimposed on the pattern.
  • LT4670-SER03 | PTP
    • PTP reader function
      Operating with a grand master, the PTP reader (master) function allows selection of reference from PTP, GNSS, VITC, LTC, analog BB or internal time.
    • PTP Follower Function
      Supports PTP follower (slave) function, acting as a PTP follower (slave) to the upper PTP grand master and as a PTP reader (master) to the lower device.
    • Two independent PTP ports
      Two PTP engines are provided, each of which can be used to build PTP systems in independent networks.
    • PTP2 terminals with two SFP gauges
      Up to two RJ-45 SFP modules or two 10GbE SFP+ modules (sold separately) can be used.
    • Local PTP function (when PTP option is added)
      PTP time can be redistributed from an analog synchronous signal and an external time source such as GNSS or NTP server.
  • LT4670-SER04 | 25G IP 12G TSG [Future Support]
    • 25G IP Signal Generation
      Test pattern generation function for IP, compliant with SMPTE ST 2110-20/30/31/40 and capable of generating 2K and 4K (3840×2160) test patterns for video signals.
    • 12G-SDI (4K) support
      Supports 12G-SDI, 3G-SDI (Level A, Level B), HD-SDI, and SD-SDI. 4 independent SDI signal output terminals are provided, each with its own pattern and phase settings.
  • LT4670-SER21 | 4K 3G-Quad Link
    • 4K (3G-Quad compatible) (LT4670-SER21)
      4K 3G-Quad Link output is available by adding 4K license option (LT4670SER21). 
      Two SDI output options (LT4670SER02) are required.

Instruction Manual

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