- Availability:
- 4-6+ Weeks - ETA
- Minimum Purchase:
- 1 unit
Purchase Protection
Every Order is Protected By BuySafe
Our commitment to sustainability ensures that every purchase supports responsible operations and a healthier planet.
SSL Secure Payment
We make sure your orders are processed as quickly as possible - stocked products are shipped next business day - Vendor direct ship products are processed directly with vendors with vendor leadtime.
Express Shipping
Price Match Guarantee
Your payment is secure
Your privacy and security are our top priority. Our advanced encrypted payment system protects your information during every transaction.

Get expert help
Our team of experienced professionals is always ready to help.
Product Details
StarTech.com HDMI over CAT6 Extender - 4K 60Hz - 330 ft. (100 m) - TAA. Type: AV transmitter & receiver, Maximum resolution: 3840 x 2160 pixels, Cable types supported: Cat6. Connectivity technology: Wired. AC input voltage: 110 - 240 V, Operating voltage: 5 V, Output current: 2 A. Width: 111 mm, Depth: 76 mm, Height: 26 mm. Package width: 250 mm, Package depth: 201 mm, Package height: 99 mm
4K HDMI® Balun | Visually Lossless Compression | IR Support
This HDMI® over CAT6 extender lets you transmit your HDMI signal over a CAT6 cable up to 330 ft. (100 m) away. The extender supports Ultra HD 4K with support for 3D and the accompanying digital audio.
Long-Distance Transmission
Extend your HDMI signal to up to 330 ft. (100 m) with this HDMI over Ethernet extender. Use your existing CAT6 cable infrastructure with a direct connection to the converter for an easy run through walls and ceilings, saving you on installation costs.
The extender also works to extend an infrared (IR) signal, enabling you to control your video source from the remote location.
Astonishing 4K Picture Quality
This HDMI Ethernet extender supports a 4K 60Hz (3840 x 2160) UHD resolution, providing four times the picture quality of high-definition (1080p), ensuring a crystal-clear picture that's ideal for displaying your 4K video content in office buildings, airports, retail settings and more.
Plus, because the extender supports 1080p and lower resolutions at up to 460 feet away, you can comfortably use this extender to make any video source look great.
Compatible with HDCP 2.2 Devices
Connect your HDMI devices and displays with confidence, knowing this extender is HDCP 2.2 compliant. This lets you harness the capabilities of HDMI-enabled devices such as Blu-ray players or online streaming devices in higher resolutions. It is also backward compatible with previous generations of HDMI and HDCP.
ST121HD20L is backed by 2-year StarTech.com warranty with free lifetime technical support.
Specifications
| General | |
|---|---|
| Brand | StarTech.com |
| Manufacturer part number | ST121HD20L |
| HSSL part number | HS-STA-ST121HD20L |
| UPC / GTIN | 0065030882637 |
| Product type | AV Extenders |
| Features | |
| Type | AV transmitter & receiver |
| Maximum resolution | 3840 x 2160 pixels |
| Cable types supported | Cat6 |
| Maximum transfer distance | 140 m |
| Chipset | Norelsys NS 5730, NS5731 |
| Maximum refresh rate | 60 Hz |
| Audio output channels | 7.1 channels |
| LED indicators | Link, Power |
| Supported graphics resolutions | 1280 x 720 (HD 720), 1920 x 1080 (HD 1080), 1920 x 1200 (WUXGA), 2560 x 1600 (WQXGA) |
| HDCP | Yes |
| Material | Metal |
| HDCP version | 1.4/2.2 |
| Product colour | Black |
| Ports & interfaces | |
| Connectivity technology | Wired |
| RJ-45 input ports | 1 |
| RJ-45 output ports | 1 |
| HDMI in | 1 |
| Number of HDMI outputs | 1 |
| Serial ports quantity | 2 |
| Remote (IR) input | 2 |
| Remote (IR) output | 2 |
| DC-in jack | Yes |
| Power | |
| AC input voltage | 110 - 240 V |
| Operating voltage | 5 V |
| Output current | 2 A |
| External power adapter | Yes |
| Power plug type | Type M |
| Operational conditions | |
| Operating temperature (T-T) | -5 - 40 °C |
| Storage temperature (T-T) | -15 - 55 °C |
| Operating relative humidity (H-H) | 0 - 95% |
| Weight & dimensions | |
| Width | 111 mm |
| Depth | 76 mm |
| Height | 26 mm |
| Weight | 271 g |
| Packaging content | |
| AC adapter included | Yes |
| Cables included | LAN (RJ-45) |
| Included power plug types | ANZ, EU, JP, NA, UK |
| Quick start guide | Yes |
| Mounting brackets included | Yes |
Specifications are supplied by the manufacturer via Open Icecat and may change without notice. HSSL part number HS-STA-ST121HD20L.
Additional information
StarTech HDMI over Cat6 Extender - 4K 60Hz - 330 Ft. (100 M) from StarTech, manufacturer part number ST121HD20L.
Specifications
| Brand | StarTech |
|---|---|
| Manufacturer part number | ST121HD20L |
| SKU | HS-STA-ST121HD20L |
| Length | 330 ft |
| Cable category | CAT6 |
| Weight | 3 lbs |
Specifications above are taken from the manufacturer's product identification for this part number. For full technical detail, request the manufacturer datasheet for ST121HD20L.
Shipping & Return
Return Policy
You need to have a Return Authorization (RA) number before returning any products to HSSL Technologies.
For a hard copy of this form and a shipping label, please include your request in the form below.
You can also request an RA online by submitting an RA Request via email. Once you have provided HSSL Technologies with the appropriate information, we will contact you with an assigned RA number.
Defective or DOA Products
DOA or defective products are returned for REPLACEMENT ONLY with the same product/model. Deviations from this policy may result in a 20% Returns Processing Service Charge.
- Defective products must be in the original factory carton with all original packing materials.
- The Return Authorization number must be on the shipping label, not the carton. Please do not write on the carton.
- Returns must be shipped freight prepaid. Products received freight collect, without an RA number, or not approved for return will be refused.
- Return Authorization numbers are valid for fourteen (14) days only. Products returned after expiration will be refused.
- HSSL credits are based on the purchase price or current price, whichever is lower.
General Return Terms
You may return most new, unopened items within 30 days of delivery for a full refund. We will also pay return shipping costs if the return is a result of our error (e.g., you received an incorrect or defective item).
You should expect to receive your refund within approximately six weeks of giving your package to the return shipper. This period includes:
- 5–10 business days for us to receive your return from the shipper
- 3–5 business days for us to process your return
- 5–10 business days for your bank to process the refund
If you need to return an item, please Contact Us with your order number and product details. We will respond quickly with instructions for returning items from your order.
Shipping Policy
We can ship to virtually any address in the world. Note that there are restrictions on some products, and certain products cannot be shipped to international destinations.
When you place an order, we will estimate shipping and delivery dates based on the availability of your items and the shipping options you select. Depending on the provider, estimated shipping dates may appear on the shipping quotes page.
Please also note that shipping rates for many items are weight-based. The weight of each item can be found on its product detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.
Has my order shipped?
Click the "My Account" link at the top right hand side of our site to check your orders status.
How do I change quantities or cancel an item in my order?
Click the "My Account" link at the top right hand side of our site to view orders you have placed. Then click the "Change quantities / cancel orders" link to find and edit your order. Please note that once an order has begun processing or has shipped, the order is no longer editable.
How do I track my order?
Click the "My Account" link at the top right hand side of our site to track your order.
My order never arrived.
Click the "My Account" link at the top right hand side of our site to track your order status. Be sure that all of the items in your order have shipped already. If you order displays your Package Tracking Numbers, check with the shipper to confirm that your packages were delivered. If your packages each show a status of "delivered", please contact customer service for assistance.
An item is missing from my shipment.
Click the "My Account" link at the top right hand side of our site to track your order status. Be sure that all of the items in your order have shipped already. If you order displays your Package Tracking Numbers, check with the shipper to confirm that your packages were delivered. If your packages each show a status of "delivered", please contact customer service for assistance.
My product is missing parts.
Click the "My Account" link at the top right hand side of our site to track your order status. Be sure that all of the items in your order have shipped already. If you order displays your Package Tracking Numbers, check with the shipper to confirm that your packages were delivered. If your packages each show a status of "delivered", please contact customer service for assistance.
When will my backorder arrive?
Backordered items are those which our suppliers are unable to predict when they will have more in stock, but as soon as they do, we will be able to ship the item to you.
Warranty
Why Choose HSSL?
We connect businesses with the right technology solutions to power growth, security, and efficiency.

Expertise
Backed by years of industry knowledge, our specialists understand the challenges modern businesses face.

Partnerships
We collaborate with top-tier technology providers to bring you innovative & high-performance products.

End-to-End Support
Our dedicated support ensures your systems stay optimized, secure, and ready for what’s next.

Scalable Solutions
Our adaptive approach ensures your IT infrastructure evolves seamlessly as your business expands.
Expert in IT & Security Solutions
At HSSL, we specialize in delivering cutting-edge IT infrastructure, cloud, and cybersecurity services that empower businesses to thrive in a digital-first world. Our trusted professionals provide reliable insights on:
-
Digital Transformation Strategy
Empowering businesses to adapt and grow through modern, secure, and scalable digital infrastructure.
-
Advanced Cybersecurity
Protecting your organization from digital threats with proactive monitoring and smart security frameworks.
-
Cloud & Infrastructure Management
Optimizing cloud performance and IT operations for seamless scalability and improved business agility.
-
Data Backup & Recovery
Ensuring business continuity through secure data management, automated backups, and rapid recovery solutions.
-
Network & Endpoint Solutions
Delivering secure, high-performance networking systems that keep your business connected and efficient.
-
Technology Consulting
Guiding organizations toward smarter IT investments and solutions that align with their long-term goals.
You May Also Like
Customers Who Bought This Product Also Bought
