3GM v1.5
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4
Chapter 1: 3GM – 3G/1.5G HD-SDI Multiplexer
Overview
The 3GM is a versatile and economical tool for interconnecting dual-link 1.5G
SMPTE372M and 3G SMPTE425M. 3GM is bi-directional, allowing dual 1.5G to 3G or 3G to
dual 1.5G conversion. Additionally, 3GM’s 3G HD-SDI output is configurable for
SMPTE425M type A or B. The 3GM can even convert 3G from/to type A or B. 3GM also
provides a monitor output which is a single link SMPTE292M 1.5G HD-SDI. The 3GM is
compatible with SMPTE259M 270Mb SDI.
Features
• Compact 3G to/from 1.5G conversion
• SMPTE425M-AB inputs, 3G outputs configurable to A or B
• Converts SMPTE425M A to/from SMPTE425M B
• Provides SMPTE292 monitor output for dual 1.5G or 3G inputs
• Fully equalizing and re-clocking with jitter attenuation
• Passes all ancillary data
Block Diagram
Figure 1. 3GM, Simplified Block Diagram
I/O Connections
NOTE:
The Lock LED indicates valid input video by color. Green is SD video, red is HD/Dual Link
video, amber is 3G video, off is no input.
SD-SDI, HD-SDI, or 3G-SDI
Input 1
SD-SDI, HD-SDI, or 3G-SDI
Output 1
SD-SDI, HD-SDI, or 3G-SDI
Output 2
SD-SDI or HD-SDI
Output Monitor
SDI Receiver
SD-SDI or HD-SDI
Input 2
SDI Receiver
SDI Transmitter
SDI Transmitter
SDI Transmitter
SDI
Processing
+ 5VDC
Power
Input
SD-SDI, HD-SDI, 3G-SDI
Link A (dual link) Output
SD-SDI, HD-SDI, 3G-SDI
Link B (dual link) Output
SD-SDI or HD-SDI
Output Monitor
SD-SDI, HD-SDI, 3G-SDI
Link A (dual link) Input
SD-SDI, HD-SDI
Link B (dual link) Input
Lock LED
