Indicators and Connections

Front Panel

The front of the USBExt3c contains three USB-C receptacles (Control, Port 0, and Port 1) and one Ethernet port. The Control and Ethernet ports are dedicated for control communication between a computer and the USBExt3c. Port 0 and Port 1 connectors are full-featured hub ports.

Rear Panel

The back of the USBExt3c contains an HDBaseT-USB3 port and a 4-pin expansion connector for RS-232, frame sync, and GPIO. Chassis ground is accessed through a grounding screw.

Expansion Connector

The USBExt3c expansion connector is a 4-pin, 1-row, shrouded male header block with 3.81mm pitch. This interface provides additional mechanisms for expandability and testing scenarios.

Expansion connector pinout

Connection Name	Pin Number	Description
TX	1	RS-232 Serial Transmit (data from USBExt3c)
GND	2	Ground
RX	3	RS-232 Serial Receive (data to USBExt3c)
IO1	4	General Purpose Input / Selector

LED Indicators

Both the front and back panels of the USBExt3c have status LEDs to communicate device status and behavior. The names and meanings of these LEDs are explained in the image and table below.

LED Indicators and Function

Type	Icon	LED Name	Color	Description
System	Person	User LED	Blue	User-controllable LED
	Power Icon	Power / Watchdog	Red / Magenta	Alternating Red and Magenta when powered
Control	Chain Links	BrainStem Link	Yellow	Link present
	Heart	BrainStem Heartbeat	Green	Blink when Heartbeat received
HDBaseT- USB3	None	HDBaseT-USB3 LEDs	Green Amber	Solid Green: USB 3 link exists Solid Amber: HDBaseT-USB3 link exists Both flash during VS6320 firmware update
Port Status: USB-C and HDBaseT -USB3	None	USB Enumeration Speed (Top LED)	Yellow	USB 2.0 Hi-Speed up to 480 Mbps
			Green	SuperSpeed 5 Gbps
			Blue	SuperSpeed+ 10 Gbps
		UFP/DFP (Bottom LED)	Magenta	Upstream (UFP) port
			Red	Downstream (DFP) port
Ethernet	None	Ethernet Activity	Green Amber	Green LED is solid when a link exists Amber LED blinks during activity