4K | 12G-SDI | 3G-SDI | HD-SDI | SD-SDI | PTP

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


A ‘True-Hybrid’ Sync Generator compatible with Black Burst/Tri-level sync/PTP signals for both SDI and IP systems

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).

Time Code I/O

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).

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.

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.

Synchronous control between devices

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.

User 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.

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Rear Panel I/O


Hardware Options

Option Description
LT4670-SER01 GNSS (GPS, GLONASS, GALILEO, BDS) synchronization
LT4670-SER02 3G/HD/SD-SDI 2 outputs
LT4670-SER03 Grand Master, Leader and Follower functions
LT4670-SER04 4 outputs 12G/3G/HD/SD SDI, IP 25G/10G pattern output
LT4670-SER11 Power supply unit

Software Options

Option Description
LT4670-SER21 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.