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3G/HD/SD-SDI Advanced Dual Test Signal Generator

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The 7851TG2-3G is a dual multi-format Test Generator. It provides a cost-effective method of generating 3Gb/s, 1.5Gb/s HD-SDI and 270Mb/s SD-SDI test signals. The 7851TG2-3G is ideal for checking signal path integrity, or to determine system performance over varying cable lengths. The 7851TG2-3G generates test signals in a wide variety of SMPTE ST 424, SMPTE ST 292-1 and SMPTE ST 259 video formats. These formats include SMPTE ST 274 (1920x1080), SMPTE ST 296 (720p), SMPTE ST 372 (Dual Link HD), and SMPTE ST 425-1 level A and level B. This also includes 4:2:2/4:4:4 sample structure, YCbCr and RGB color space and definitions for 10/12 bit depths.

An included linear mixer can be used to key full frame overlays or specialized video elements. User supplied full frame bitmaps and stereo wave files can be played out for trouble slides, link identification or specialized test signals. Stereoscopic 3D video test signals are included.

The dual on-board test signal generators can be independently controlled providing test signals for two purposes simultaneously.

Test Generator # 1 (TG1) has 4 outputs and can generate:

  • 4 outputs of the same 3G, HD, or SD-SDI test pattern OR
  • 2 outputs of the same Dual Link HD-SDI (SMPTE ST 372) test pattern

Test Generator #2 (TG2) has 2 outputs and can generate:

  • 2 outputs of the same 3G, HD, or SD-SDI test pattern OR
  • 1 output of the same Dual Link HD-SDI (SMPTE ST 372) test pattern

The 7851TG2-3G can be configured via dedicated on-screen menu and is also VistaLINK® capable, offering remote monitoring, control and configuration capabilities via Simple Network Management Protocol (SNMP) giving the flexibility to manage operations, including signal monitoring and module configuration from SNMP capable control systems (Manager or NMS).


  • 2 Independent Test Signal Generators (common frame rate)
  • Wide variety of image formats including 2048p, 2048i, 1080p, 1080i, and 720p video formats
  • Support for a wide variety of frame rates (23.98, 24, 25, 29.97, 30, 50, 59.94, 60 fps)
  • Selectable genlock input format - bi-level or tri-level sync
  • 3Gb/s full field test signals
  • Dual and single link 1.5Gb/s test signals
  • SD 270Mb/s test signals
  • Audio test tone generation
  • Payload ID inserter required for all SMPTE ST 425-1 and ST 372 signals
  • Stereoscopic 3D test signal generation in a number of formats (Dual Stream, Side-by-side, T/B, E/O)
  • Linear keyer to allow full frame overlays and specialized video items (sweep and beeps, etc.)
  • User supplied full frame bitmap (.BMP) support.
  • User supplied stereo audio wave file (.WAV) support.
  • Dedicated monitoring output for on screen display configuration
  • Card edge status LEDs
  • VistaLINK® capable for remote monitoring, control and configuration capabilities via SNMP; using VistaLINK® PRO, CP-2116E or CP-2232E Control Panels. VistaLINK® is available when modules are used with the 3RU 7800FR frame and a 7800FC VistaLINK® Frame Controller module in slot 1 of the frame


Gen Lock Input

Type Menu selectable - depends on output video format
HD Tri-level Sync
NTSC or PAL Color Black 1V p-p
Composite Bi-level sync (525i or 625i) 286/300mV
Connector BNC per IEC 61169-8 Annex A
Termination 75Ω (jumper selectable)

Serial Video Outputs

3G SMPTE ST 425-1 Level A and B
HD-SDI SMPTE ST 292-1, 4:2:2 YCbCr (single link)
SMPTE ST 372 (dual link)
Number of Outputs
TSG 1 4
TSG 2 2
Embedded Audio Up to 4 groups of audio (4 channels in one audio group) as specified in SMPTE ST 299-1
Selectable tone frequencies (from 60Hz to 10kHz) and audio level control
Connectors BNC per IEC 61169-8 Annex A
Signal Level 800mV nominal
V Phasing Infinite lines
H Phasing Infinite samples
DC Offset 0V ±0.5V
Rise & Fall Time 200ps nominal
Overshoot < 10% of amplitude
Wide Band Jitter < 0.2UI HD
< 0.3UI 3G


Voltage +12V DC
Power 15 Watts
EMI/RFI Complies with FCC Part 15, Class A EU EMC Directive


Number of slots
350FR 2
7700FR-C 2
7800FR 1

Ordering Information

7851TG2-3G 3G/HD/SD-SDI Advanced Dual Test Signal Generator

Ordering Options

Notes Rear plate must be specified at time of order - eg: [model]+3RU
Rear Plate Suffix
+3RU 3RU rear plate for use with 350FR, 7700FR-C or 7800FR Multiframes


350FR Portable Multiframe which holds 7 single slot modules
7700FR-C 3RU Multiframe which holds 15 single slot modules
7800FR 3RU Multiframe which holds 15 single slot modules