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StarTech VGA over Cat 5 UTP Video Extender / Repeater ST121EXT

  • Extends video cables by up to 500 ft
  • No software or drivers required
  • Supports VGA, SVGA, and Multisync monitors
  • Provides crystal clear picture quality

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

The ST121EXT VGA over Cat 5 UTP Video Extender Repeater allows you to further extend your VGA signal over Cat5 (or better) cabling. This device is specially designed for use with the ST121 VGA Video over Cat 5 extender series, which is comprised of a transmitter unit (ST1214T, ST1218T or ST121UTP) and an ST121R receiver unit.

The ST121EXT VGA extender repeater adds to the overall extension distance capability, for a total of 300 meters (1,000 feet) between the transmitter and receiver unit. It also features a VGA output, allowing you to connect an additional display at the mid-point of your setup.

For even more versatility, up to three ST121EXT repeater units can be used between the transmitter and receiver units. This allows monitors to be connected at each repeater station, and further extends the overall connection distance by 150 meters (492 feet) per repeater used.

  • newegg Cascadable Design You can add up to three ST121EXT repeaters between the transmitter and the receiver to further extend the connection distance.
  • newegg Ease of Use Pure hardware design; no software or drivers required.

Learn more about the STARTECH ST121EXT




Extender & Repeater Type
Non Wall Plate Extender


150 m / 500 ft.
Resolution Support
Maximum Analog Resolutions: 1024x768 @ 500ft(150m)


Other Connector
2 - RJ-45 Female
2 - VGA (15 pin; High Density D-Sub) Female


Power Supply
Power Adapter Included: Yes
Output Voltage: 9 DC
Output Current: 0.6A
Center Tip Polarity: Positive


Daisy-Chain: Yes
Ports: 1
Cabling: Cat 5 UTP or better
Maximum Analog Resolutions: 1024x768 @ 500ft(150m)
Enclosure Type: Aluminum


Acts as repeater to add 820 feet to total extension distances provided by ST121UTP and ST1214T

Extends video cables by up to 500 ft. (150m)

Provides additional display/drop points for existing Cat5 signal extensions

Provides crystal clear picture quality

Pure hardware design, no software or drivers required

Supports VGA, SVGA, and Multisync monitors

Dimensions & Weight

4.1"L x 2.5"W x 0.8"H

Package Contents

Package Content
1 - 9V AC 500ma ADAPTORS
Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 2 years
  • Limited Warranty period (labor): 2 years
  • Read full details

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