
Io 4K Plus Capture, Display, Convert v14.0r2 10 www.aja.com
Cable Connections
Figure 1. Io 4K Plus Connectors
Thunderbolt 3
Ports (2)
Bidirectional
12G/6G/3G/HD/SD-SDI BNCs (4)
DB-9F RS-422
Machine Control
Balanced Audio In/Out
DB-25F (8-Ch)
4-Pin XLR
DC Power Input
HDMI
Output
HD/SD-SDI
Monitor Out BNC
HDMI
Input
LTC Output
Reference or
LTC Input
Connector Descriptions
Thunderbolt 3
The Io 4K Plus provides the third-generation Thunderbolt 3 (USB-C) ports to
support increased bandwidth between host computer and I/O device. Two ports
are provided for daisy-chained network configurations.
Bi-directional SDI I/O
Four bidirectional BNC connectors can be configured in a variety of ways via the
AJA Control Panel, including:
• Two HD/SD inputs (SDI 1 and SDI 2) and two outputs (SDI 3 and SDI 4)
• Two 4K/UltraHD single-link 6/12G inputs (SDI 1 and SDI 2) and two 4K/UltraHD
single-link 6/12G outputs (SDI 3 and SDI 4)
• One 4K/UltraHD two-link 3G input (SDI 1 and SDI 2) and one and one two-link
3G output (SDI 3 and SDI4)
• One 4K/UltraHD four-link 1.5/3G input (SDI 1, SDI 2, SDI 3, and SDI4) input,
Quadrant or 2SI.
• One 4K/UltraHD four-link 1.5/3G output (SDI 1, SDI 2, SDI 3, and SDI4) output,
Quadrant or 2SI.
Dedicated SDI HD/SD Output
One BNC connector is provided for full-time, real-time output of HD/SD video. 4K
video is down-converted to 2K HD and UltraHD is down-converted to HD.
HDMI Input and Output
Two HDMI connectors provide input and output of HDMI video and multi-
channel embedded audio.
• HDMI 2.0 input and output, supporting UltraHD and 4K resolutions at up to
60p (4:2:2), 10-bit and 8-bit
• Supports two or eight channel HDMI audio input and output