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Quick-Start Guide

To view manuals, FAQs, videos, drivers, downloads, technical drawings, and more, visit www.startech.com/support.

Manual Revision: March 7, 2019 3:58 PM

Product Diagram (ST121HD20V)

Transmitter

Port

Function 

Front

1

Service Port

•  Used for firmware updates.

2

EDID Switch

•  Used to copy EDID settings from the 

Video 

Sink Device

 connected to the 

HDMI

 

Receiver

.

3

IR Out Port

•  Used to connect the

 IR Blaster 

to the 

HDMI 

Transmitter

.

4

RJ45 Port

•  Used to connect the 

Transmitter

 to the 

Receiver

.

• 

Power Indicator:

 Illuminates Green when the 

Transmitter

 is receiving power.

• 

Connection Indicator:

 Illuminates Amber 

when the 

HDMI Transmitter 

is sending a 

signal to the 

HDMI Receiver

Back

5

HDMI In Port

•  Used to connect a 

Video Source Device

 to the 

HDMI Transmitter

.

6

HDMI Out Port

•  Used to connect a 

Display Device

 to the 

HDMI 

Transmitter

.

7

DC 12V Port

•  Used to power the 

HDMI Transmitter 

and 

HDMI Receiver

 (using POE Power Over 

Ethernet).

HDMI over CAT6 Extender | 4K 60Hz

1

Receiver

Port

Function 

Front

1

Service Port

•  Used for firmware updates.

2

IR In Port

•  Used to connect the

 IR Receiver 

to the 

HDMI

 

Receiver

.

3

RJ45 Port

•  Used to connect the 

HDMI Receiver

 to the 

HDMI Transmitter

.

• 

Power Indicator:

 Illuminates Green when the 

Receiver

 is receiving power.

• 

Connection Indicator:

 Illuminates Amber 

when the 

HDMI Transmitter 

is sending a 

signal to the 

HDMI Receiver

Back

4

HDMI Out Port

•  Used to connect a 

Display Device

 to the 

HDMI 

Receiver

.

Requirements

For the latest requirements and full manual,  please visit 

www.startech.com/

ST121HD20V

2

3

4

5

6

7

1

2

3

4

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