i have on cmera the out put is hdmi i want to stream this to server by cat5 how can i do?

You cannot do that with this item. This does not convert hdmi video into streaming video for playing over a network. It only plays hdmi video over cat5 wiring between the 2 boxes. To do what you want you'll need to look into products that do video streaming conversion.

I am looking to hook up multiple monitors to a a single source can it be done with this item if I buy more than one. Would I require a splitter?

This is a one to one extender. If you want to go to multiple monitors you would have to have a splitter in place before going into this extender. In going from a Mac to a Projector I did have to change the dial on the side to the greatest distance and I did have to manually set the type of system it was connecting to. Also the power goes on the receiving end not the sending end. Those were a few things that got me in the setup. Now though it works great.

What is included in the package of the StarTech.com ST121SHD50?

The package includes 1 x HDMI over CAT5e/6 UTP transmitter, 1 x HDMI over CAT5e/6 UTP receiver, 1 x universal power adapter (NA / EU / UK / AU), 2 x mounting brackets, 2 x foot pad set, and 1 x instruction manual.

What is the maximum distance for HDMI transmission using Cat5e cabling?

The maximum distance for HDMI transmission using Cat5e cabling is 50m (165 ft.) for solid cables and 40m (130 ft.) for stranded cables.

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StarTech.com ST121SHD50 HDMI Over CAT5/CAT6 Extender with Power Over Cable - 165 ft (50m) HDMI Video/Audio Over Dual Ethernet Cable Extender - 1080p

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Extend HDMI up to 165 ft. (50m) over Cat5e/6 cabling with Power over Cable to Receiver
HDMI over Cat5
HDMI Cat5 Extender
HDMI over Cat6
HDMI extender over Cat5
HDMI Ethernet Extender
HDMI over Dual Cat5/6e Video/Audio Extender
1920 x 1080
HDMI over Cat5e Cat6 Video Extender Kit
Supports Cat5e (50m) or Cat6 (40m) Ethernet cabling

Overview

Specs

Reviews (4)

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Extend HDMI up to 165ft (50m) over Cat5e6 cabling with Power over Cable to Receiver.

Model
Brand	StarTech.com
Model	ST121SHD50

Performance
Distance	Maximum Distances - (1080i only) CAT5E (stranded) - 40m (130 ft.) CAT5E (solid) - 50m (165 ft.) CAT6 (stranded or solid) - 50m (165 ft.) Max Distance: 50m / 165 ft.
Resolution Support	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

Connection
HDMI	Local Unit Connectors: 1 x HDMI (19-pin) Female Remote Unit Connectors: 1 x HDMI (19-pin) Female
Network Interface	Local Unit Connectors: 2 x RJ-45 Female Remote Unit Connectors: 2 x RJ-45 Female

Indicater
LED Indicator	LED Indicators: 1 x Power

Power
Power Consumption	18W
Power Supply	Center Tip Polarity: Positive Input Current: 0.5A Input Voltage: 100 ~ 240 AC Output Current: 1.5A Output Voltage: 12 DC Plug Type: M Power Source: AC Adapter Included

Specification
Specification	Hardware Audio: Yes Cabling: Cat 5 UTP or better Daisy-Chain: No Ports: 1 Rack-Mountable: Yes Performance Wide Screen Supported: Yes Environmental Humidity: 0% - 80% Operating Temperature: 0 to 40 celsius degree Storage Temperature: -10 to 60 celsius degree

Feature
Feature	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

Dimensions & Weight
Dimensions	0.80" x 3.10" x 2.00"
Weight	5.50 oz.

Package Contents
Package Content	1 x HDMI over CAT5e/6 UTP transmitter 1 x HDMI over CAT5e/6 UTP receiver 1 x universal power adapter (NA / EU / UK / AU) 2 x mounting brackets 2 x foot pad set 1 x instruction manual

Additional Information
First Listed on Newegg	October 14, 2013

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Limited Warranty period (parts): 2 years
Limited Warranty period (labor): 2 years
Read full details

Return Policies

We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1st, 2025 and December 31, 2025 you will have until January 31, 2026 to return your product.

Return for refund until: January 31, 2026

Return for replacement until: January 31, 2026

This item is covered by Newegg.com's Extended Holiday Return Policy. Read full return policy for details.

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StarTech.com ST121SHD50 HDMI Over CAT5/CAT6 Extender with Power Over Cable - 165 ft (50m) HDMI Video/Audio Over Dual Ethernet Cable Extender - 1080p

Learn more about the STARTECH ST121SHD50

Customer Reviews of the STARTECH ST121SHD50

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info

Item#: N82E16815158380

Best Sellers

StarTech.com ST121SHD50 HDMI Over CAT5/CAT6 Extender with Power Over Cable - 165 ft (50m) HDMI Video/Audio Over Dual Ethernet Cable Extender - 1080p

Learn more about the STARTECH ST121SHD50

Customer Reviews of the STARTECH ST121SHD50

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info