Timing & Synchronization


4K UHD 12G-SDI Embedder / De-embedder and Frame Synchronizer

AMX-8952 is a key building block, providing audio embedding, de-embedding and synchronization in HD-SDI and UHD 12G-SDI environments. This enables your infrastructure to support the next generation of high-quality production with technology that is scalable, easily deployed, and reliable.

The AMX-8952 family consists of three variants that support unbalanced AES, balanced AES or analog audio interfaces. The audio interfaces are bi-directional, so one card is configurable as embedder or de-embedder, making it easy to deploy wherever you need it.

The card features useful audio processing such as audio shuffling and per-channel gain and delay, which enables you to make critical adjustments to incoming feeds. An optional Frame Synchronizer provides synchronization and adjustable video delay.

AMX also offers a secondary 12G-SDI input, allowing for clean/quiet switching triggered manually or by loss-of-signal detection. This is a great solution for signal path protection switching.

Full control and monitoring of the card are available via the DashBoard control system, which makes it easy to integrate AMX-8952 into your facility’s centralized control scheme.

Embed in UHD

A key building block in any SDI facility, AMX allows you to embed and de-embed audio into HD and UHD SDI workflows. We make it easy to marry your audio workflow with your video production.

Synchronize in UHD

Take advantage of the remote feeds offered by AMX. The optional Frame Synchronizer with video delay makes AMX a great edge device for your mobile or studio installation.

Clean Switch in UHD

With primary and backup inputs, AMX provides clean/quiet switching wherever you need it. Additionally, ensure your critical paths are protected with loss-of signal failover.


  • Supports HD, 3G and 12G-SDI
  • Future-proof and flexible:
    • One card can be configured as an embedder or de-embedder
    • Software options can be added any time:
      • License for 12G SDI
      • License for frame-sync functionality
  • Audio Processing:
    • Audio processing support (sum, gain, mute, tone, SRC and delay)
    • Full audio shuffle 32×32
    • Dolby® pass-through
    • Audio Embedding / De-embedding
    • 16-channel AES unbalanced AMX-8952-A
    • 16-channel AES balanced AMX-8952-B
    • 8-channel analog audio AMX-8952-C
  • One configurable I/O port:
    • Configure as an output for additional distribution
    • Configure as an input for dual-source input clean switch
  • Clean switch functionality configurable for automatic failover or manual control
  • Control:
    • Full configuration, setup and monitoring via DashBoard™
    • 2 x GPIO for control or tally
    • Rosstalk
    • SNMP
  • Hot swappable from the front of the frame without de-cabling any rear connections
  • High-density openGear solution – up to 10 cards per OG3 or OGX frame
  • 5-year transferrable warranty
Video Interface HD-BNC: 1 in, 1 out, 1 bidirectional (configurable)
Standards HD-SDI (SMPTE ST 274)


12G-SDI (SMPTE ST-2081-1)*

Format Support 720p 50/59.94

1080i 50/59.94

1080p 23.98/24/25/29.97/30/50/59.94

1080pSF 23.98/24

2160p 23.98/24/25/29.97/30/50/59.94*

Adjustable Video Delay Dependent on input video format, please refer to the User Guide
Adjustable Audio Delay Up to 1s for all supported video formats
Reference Input Supports openGear frame reference
SDI Inputs
Cable Length (Belden 1694A) HD-SDI: 150m

3G-SDI: 120m

12G-SDI: 50m

Return Loss >15dB to 1.5GHz

>10dB to 3GHz

>4dB to 12GHz

Impedance 75Ω
SDI Outputs
Return Loss >15dB to 1.5GHz

>10dB to 3GHz

>4dB to 12GHz

Rise/fall Time <270ps @ 1.485Gbps

<135ps @ 2.97Gbps

<45ps @ 11.88Gbps

Alignment Jitter 1.485Gbps: <0.2 UI

2.97Gbps: <0.3 UI

11.88Gbps: <0.3 UI

Output Level 800mV ± 10%
DC Offset 0V ± 50mV
Overshoot <10% @ 1.485 Gbps

<10% @ 2.97 Gbps

<15% @ 11.88Gbps

AES I/O (Unbalanced – AMX-8952-A)
Physical 8 bidirectional HD-BNC
Standards AES-3id-2001
AES Inputs
Impedance 75Ω
Level 50mV – 2.5V p-p @ 48kHz
Sampling Rate 32kHz – 96kHz
Minimum Audio Delay 0.37ms
Cable Length 800m @ 48kHz
AES Outputs
Impedance 75Ω
Level 1V p-p
Sampling Rate 48kHz
AES I/O (Balanced – AMX-8952-B)
Physical 8 bidirectional WECO
Standards AES-3id-2001
AES Inputs
Impedance 110Ω
Level 100mV – 10V p-p @ 48kHz
Sampling Rate 32kHz – 96kHz
Minimum Audio Delay 0.37ms
Cable Length 450m @ 48kHz
AES Outputs
Impedance 110Ω
Level 4V p-p
Sampling Rate 48kHz
Analog I/O (AMX-8952-C)
Physical 8 bidirectional WECO
Sampling Rate 48kHz
Analog Inputs
Impedance 12kΩ
Maximum Input Level +24dBu
Frequency Response ±0.1dB 20Hz – 20kHz
Signal-to-noise Ratio -98dBA
THD < -90dB (0.003%)
Crosstalk < -95dB
Amplitude Linearity < 0.6dB @ -100dBFS
Maximum Input Level +24dBu
Frequency Response ±0.1dB 20Hz – 20kHz
Analog Outputs
Impedance 12kΩ
Maximum Output Level +24dBu
Frequency Response ±0.1dB 20Hz – 20kHz
THD < -90dB (0.003%)
Crosstalk <-80dB 20Hz-20kHz
Amplitude Linearity < 0.5dB @ -100dBFS

*All 12G/UHD specifications and functionality require 12G software license


AMX Diagram A










Ordering Code Description
1 SDI in/ 1 SDI out / 1 SDI I/O 8 unbalanced 75 Ohm AES 2 Slots
View Rear Module
1 SDI in/ 1 SDI out / 1 SDI I/O 8 balanced 110 Ohm AES 2 Slots
View Rear Module
1 SDI in/ 1 SDI out / 1 SDI I/O 8 Analog WECO 2 Slots
View Rear Module


Ordering Code Description
AMX-8952-UHD-LICENSE Adds support for UHD video formats
AMX-8952-FS-LICENSE Frame Synchronizer and Delay License
openGear AMX-8952 Manual Download
openGear Manuals Download

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