GRASS VALLEY 8925DMB-U Manual, Datasheet

Specifications
Ordering Information
198925DMB-U SD/HD Unbalanced Audio De-Embedder
Key Features
Eight-channel SD/HD audio de-embedder •
(demultiplexer) with AES outputs
Any embedded audio stream can be •
passed and distributed to any discrete 
output
Choice of four unbalanced AES outputs •
Four HD-SDI/SDI outputs (one active loop-•
through)
Support 48 kHz audio sample rate and  •
20-bit or 24-bit audio sample resolution 
Handles Dolby E •
Fiber-ready option for receiving or •
transmitting over fiber
Remote control and monitoring via •
Ethernet frame interface
Applications
HD-SDI audio de-embedding •
SD and HD signal handling•
Receiving SD/HD-SDI from fiber and  •
de-embedded audio
Supported Frame Types
GeckoFlex with 8900NET (Net Card) for configuration
Power Rating
7.4 Watts – single slot
Video Inputs
SD/HD-SDI:
•Inputequalization:HDupto125m,SDupto330m
•Auto-sensing:yes
Optical: Single-mode (optional)
Formats supported: 1080i @ 59.94, 50,  
720p @ 59.94, 50, 480i @ 59.94, 576i @ 50,  
1080p @ 23.98, 1080sF @ 23.98
Audio Outputs
AES: Four outputs
Signal type – unbalanced: AES-3id-2001•
Common mode range: N/A•
Sampling rate: 48 kHz•
Resolution: 20- or 24-bit•
Output return loss: >15 dB (100 kHz to 12 MHz)•
Inputimpedance:75Ω•
Connector type: BNC•
Video Outputs
SD/HD-SDI: Four outputs
•Returnloss:>15dB,5to270MHz; 
>15 dB typical, to 1.5 GHz
•Signallevel:SDI800mVp-p±10%
•Rise/falltime(20-80%):140pstypicalforHD, 
640 ps typical for SD 
Output jitter, low jitter applied:•
  < 0.2 UI HD > 100 kHz 
  < 1.0 UI HD 10 Hz > 100 kHz 
  < 0.2 UI SD > 1 kHz 
  < 0.2 UI SD 10 Hz > 1 kHz
Optical: Single-mode (optional)
Electrical Length (delay)
SDI: HD input <400 ns, SD input <1.2 µs
AES (@48 kHz): HD input 0.41 ms, SD input 0.83 ms
De-Embedding
Output audio stream: Silence or any embedded pair
Output audio resolution: 20-, 24-bit, or auto as input
This module can be mounted in a GeckoFlex 
frame but not in other 8900 series frames, 
including Gecko-A or Gecko-V frames. As this 
module has no card-edge controls, an 8900NET 
(Net Card) Network Interface card is required to 
configure this module.
8925DMB-U
SD/HD de-embedder, front and rear modules, four 
unbalanced audio inputs, front and rear module set
SFP-13103G-M1TRX
Fiber transceiver. Low-power 1310 nm single-mode 
optical transceiver
SFP-13103G-M1DTX
Dual fiber transmitter. Dual low-power 1310 nm single-
mode optical transmitter
SFP-13103G-M1DRX
Dual fiber receiver. Dual low-power 1310 nm single-
mode optical receiver
For detailed specifications, installation, and setup 
instructions see:
www.grassvalley.com/docs/modular
The 8925DMB-U is a compact SD/HD digital 
audio de-embedder (audio demultiplexer) 
module. It provides four unbalanced AES 
outputs and supports both PCM audio and 
Dolby E. This module is ideal for building dense 
audio/video infrastructure for production and 
playout applications. 
The 8925DMB-U also provides four SD/HD-SDI 
outputs, one of which is a direct reclocked 
feed of the input. The four AES outputs are 
synchronous to the video. Output PCM audio 
sample resolution can be forced to 20 or 24 
bits.
With its fiber-ready architecture, the 
8925DMB-U can be configured to support up 
to two fiber inputs or up to two fiber outputs. 
Configured as a fiber transceiver it can take SDI 
from fiber, de-embed audio, and provides SDI 
output over fiber and discrete AES outputs. The 
dual-receiver option makes it ideal for receiving 
incoming feeds from longer distances with fiber 
input selection, and locally de-embedding audio 
for providing audio and SDI over copper.
8900UVF-R
J1 J2
J3 J4
J5 J6
J7 J8
J9
FIBER
Audio
Output
Audio
Output
SD/HD
SDI Out
SD/HD
SDI Out
Reclocked
Output
SD/HD
SDI In
Audio
Output
Audio
Output
SD/HD
SDI Out
SD/HD
SDI Out
Fiber In/Out
Connector

All parameters can be adjusted via standard 
HTML Web browsers or via the Newton Control. 
In addition, NetConfig and NetCentral can be 
used for remote configuration and SNMP signal 
health monitoring.
4X
AES
Out
3X SD/HD
SDI Out
SD/HD
Reclocked
SDI Out
SD/HD
SDI In
Equalizer and
Reclocker
Only one fiber
option may be
selected
Fiber TX
Fiber TX
Fiber TX
Fiber RX
Fiber RX
Fiber RX
SD/HD
Optical In
2X SD/HD
Optical In
SD/HD
Optical Out
2X SD/HD
Optical Out
Option Option
Option
DMUX

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