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HDMI over dual CAT5e/CAT6 extender with Power over Cable
A dual-cable HDMI extender kit with Power over Cable and EDID emulation, supporting 1080i to 50m and 1080p over shorter CAT5e/CAT6 runs.

Key capabilities
Power over Cable
One power adapter can be connected at either the transmitter or receiver.
EDID emulation
Built-in EDID handling helps maintain native resolution compatibility.
Up to 50m at 1080i
The exact table lists up to 50m using suitable CAT5e/CAT6 cabling for 1080i.
1080p to 40m on CAT6
The exact table lists 1080p up to 40m with CAT6.
What to know before buying
This model requires two CAT5e/CAT6 cables between transmitter and receiver. The 50m maximum applies to specified 1080i scenarios; 1080p maximum distance is lower.
Australian version and manufacturer warranty
This item is the Australian version supplied by DeviceDeal and is covered by the official StarTech.com 2-year manufacturer warranty in Australia.
Please retain your DeviceDeal tax invoice as proof of purchase. Warranty coverage and claims are subject to StarTech.com warranty terms, eligibility requirements and product assessment.
Frequently asked questions
How many CAT cables are required?
What is the listed maximum distance?
How far can 1080p run over CAT6?
Does it support Power over Cable?
Does it use EDID emulation?
What is the maximum HDMI cable length noted at each end?
Is mounting hardware included?
What warranty applies in Australia?
(ST121SHD50)
Features and highlights
Power over Cable
One power adapter can be connected at either the transmitter or receiver.
EDID emulation
Built-in EDID handling helps maintain native resolution compatibility.
Up to 50m at 1080i
The exact table lists up to 50m using suitable CAT5e/CAT6 cabling for 1080i.
1080p to 40m on CAT6
The exact table lists 1080p up to 40m with CAT6.
- Up to 50m
- 1080p support
- Dual CAT5e/CAT6
- 2-year warranty
Specifications
Verified specifications for StarTech ST121SHD50.

Warranty Information
| Warranty | 2 Years |
|---|
Hardware
| Audio | Yes |
|---|---|
| Cabling | Cat 5 UTP or better |
| Daisy-Chain | No |
| Ports | 1 |
| Rack-Mountable | Yes |
Performance
| General Specifications | Maximum Distances - (1080i only) CAT5E (stranded) - 40m (130 ft) CAT5E (solid) - 50m (165 ft) CAT6 (stranded or solid) - 50m (165 ft) |
|---|---|
| Max Distance | 50 m / 165 ft |
| Maximum Digital Resolutions | 1080p / 1920x1080 |
| Supported Resolutions | 1080i - Cat6 (stranded or solid) - up to 50m - Cat5e (solid) - up to 50m - Cat5e (stranded) - up to 40m 1080p - Cat6 (solid or stranded) - up to 40m - Cat5 (solid) - up to 20m - Cat5 (stranded) - up to 16m See product manual for further details |
| Wide Screen Supported | Yes |
Connector(s)
| Local Unit Connectors | 1 - HDMI (19 pin) Female |
|---|---|
| Local Unit Connectors | 2 - RJ-45 Female |
| Remote Unit Connectors | 1 - HDMI (19 pin) Female |
| Remote Unit Connectors | 2 - RJ-45 Female |
Indicators
| LED Indicators | 1 - Power |
|---|
Power
| Center Tip Polarity | Positive |
|---|---|
| Input Current | 0.5 A |
| Input Voltage | 100 - 240 AC |
| Output Current | 1.5 A |
| Output Voltage | 12 DC |
| Plug Type | M |
| Power Consumption (In Watts) | 18 |
| Power Source | AC Adapter Included |
Environmental
| 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) |
Physical Characteristics
| Color | Black |
|---|---|
| Enclosure Type | Aluminum |
| Product Height | 0.8 in [2.1 cm] |
| Product Length | 3.1 in [80 mm] |
| Product Width | 2 in [51 mm] |
| Weight of Product | 11.1 oz [314 g] |
Packaging Information
| Package Height | 2.6 in [65 mm] |
|---|---|
| Package Length | 9.3 in [23.7 cm] |
| Package Width | 6.2 in [15.7 cm] |
| Shipping (Package) Weight | 33 oz [935 g] |
What's in the Box
| Included in Package | 1 - HDMI over CAT5e/6 UTP transmitter |
|---|---|
| Included in Package | 1 - HDMI over CAT5e/6 UTP receiver |
| Included in Package | 1 - universal power adapter (NA / EU / UK / AU) |
| Included in Package | 2 - mounting brackets |
| Included in Package | 2 - foot pad set |
| Included in Package | 1 - instruction manual |
| SKU | ST121SHD50 |
| Barcode # | 65030851404 |
| Brand | STARTECH |
| Shipping Weight | 0.9400kg |
| Shipping Width | 0.100m |
| Shipping Height | 0.050m |
| Shipping Length | 0.230m |
| Shipping Cubic | 0.001150000m3 |
StarTech.com warranty in Australia
This item is the Australian version supplied by DeviceDeal and is covered by the official StarTech.com 2-year manufacturer warranty in Australia.
Please retain your DeviceDeal tax invoice as proof of purchase.
Warranty coverage and claims are subject to StarTech.com warranty terms, eligibility requirements and product assessment.
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