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StarTech HDMI Over CAT5/CAT6 Extender with Power Over Cable - 165 ft (50m) ST121SHD50

  • Cat5e (50m) &Cat6 (40m) Ethernet cabling
  • No software/drivers required
  • HD Res. up to 1080p (1920x1080)
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The StarTech ST121SHD50 HDMI extender is an economical and easy-to-use solution that extends an HDMI audio/video signal by up to 165 feet (50 meters) over dual Cat5e cables, or by 130 feet (40 meters) over dual Cat6 cables. You can use your existing or new Ethernet infrastructure wiring, without the need of an expensive HDMI cable. It supports high-definition resolutions of up to 1920x1080p, and the accompanying multi-channel digital audio, to maintain A/V quality after extension. Including a transmitter and a receiver, this kit supports Power over cable, and only requires a single power adapter that can be connected to either the Transmitter or Receiver. The extender kit is perfect for point-to-point digital signage applications that require high-quality HDMI video, or industrial environments where a display is installed in a convenient viewing area, while the system equipment is kept in a clean, secured environment.

For added flexibility and convenience, HDMI cables up to 32 feet (10 meters) can be connected to both the local and remote units, which lets you extend your HDMI signal to even further distances.

Note: The extender does not work through Ethernet equipment, such as switches or routers.

  • newegg Superior A/V Quality Support high resolutions of up to 1920x1080 / 1080p, and the accompanying digital audio, for superior audio/video quality.
  • newegg Power over Cable This kit features Power over cable, requiring only a single power adapter that can be connected to either the Transmitter or Receiver, great for areas where access to outlet is limited.
  • newegg Clean Installation Use the included mounting hardware for a clean, professional installation.

Learn more about the STARTECH ST121SHD50




50 m/165 ft
Resolution Support


LED Indicator
1 - Power


Power Supply
Input Current: 0.5 A
Input Voltage: 100~240V
Output Current: 1.5 A
Output Voltage: 12 DC


Local Unit Connectors
1 x HDMI (19 pin) Female
2 x RJx45 Female

Remote Unit Connectors
1 x HDMI (19 pin) Female
2 x RJx45 Female

Maximum Distance CAT5E
165ft (50m)
CAT6: 130ft (40m)

Wide Screen Supported: Yes

Humidity 0% - 80 %
Operating Temperature 0 C to 40 C (32 F to 104 F)
Storage Temperature -10 C to 60 C (14 F to 115 F)


Power Over Cable allows a single power source to operate the Transmitter and Receiver

Supports Cat5e (50m) or Cat6 (40m) Ethernet cabling

No software/drivers required

Supports HD resolutions up to 1080p (1920x1080)

Includes transmitter (local) and receiver (remote) units


3.1"(L) x 2"(W) x 0.8"(H)
0.35 lbs.


Package Content
1 x HDMI over CAT5e/6 UTP Transmitter
1 x HDMI over CAT5e/6 UTP Receiver
1 x Universal Power Adapter (EU, UK, NA)
2 x Mounting Brackets
2 x Foot Pad Set
1 x User Manual

Quick Info


  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years

Customer Reviews of the STARTECH ST121SHD50

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  • Scotty S.
  • 9/8/2014 9:25:41 PM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat Extenders

Pros: They work
Active Extenders
Lights tell you the status of the extender

Cons: A bit expensive, but you get what you pay for.
You do have to adjust the EQ knob to set the picture up.

Other Thoughts: If you are experiencing noise in the signal, try adjusting the EQ slider / Holding down the EDID copy button on the transmitter. Also, double check the cable and the CAT6 jack wiring.

It happened to me where I kept getting noisy signal quality. I opened up the wall place for the CAT6 jack, and it was wired incorrectly (The wires were in order, but they were installed on the jack correctly...causing poor contact). I just wanted to share that with people before they RMA the units thinking it's the unit that's bad.

2 out of 2 people found this review helpful. Did you? Yes No

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