BK-EX100C-K Overview and Use Cases

What Is the BK-EX100C-K?

The OREI BK-EX100C-K is a USB-C to HDMI extender kit that sends video from a USB-C laptop or PC to an HDMI display up to 100ft over a single CAT 6 / CAT 7 cable.

The kit includes a USB-C Sender and HDMI Receiver. The USB-C source connects to the Sender, the HDMI display connects to the Receiver, and a CAT cable connects the Sender to the Receiver.

The BK-EX100C-K supports HDMI 2.1 and HDCP 2.3, with a video bandwidth of 32Gbps. It supports video resolutions up to 4K@120Hz, 4K@60Hz, 1080p, 720p, and lower formats. It also supports HDR10, DSC 1.2a, DP 1.4 Alt Mode, 8 / 10 / 12-bit color, LPCM audio, DTS, Dolby Digital, DTS-HD Master Audio, and Dolby TrueHD. No drivers or software are required.

The BK-EX100C-K is useful for laptops, PCs, gaming setups, conference rooms, classrooms, presentations, digital signage, offices, and commercial AV setups where a USB-C computer needs to connect to a remote HDMI display.

IMPORTANT — USB-C Source Must Support Video Output

The BK-EX100C-K uses a USB-C input on the Sender.

The USB-C port on the laptop or PC must support video output.

Not every USB-C port supports video. Some USB-C ports are only for charging or data transfer.

For this product to work, the USB-C port should support DP 1.4 Alt Mode or USB-C video output.

If there is no video, confirm that the computer’s USB-C port supports external display output.

IMPORTANT — BK-EX100C-K Supports 4K@120Hz

The BK-EX100C-K supports video resolutions up to 4K@120Hz.

To use 4K@120Hz, the laptop or PC, USB-C video output, CAT cable, Receiver, HDMI cable, and display must all support the required resolution and refresh rate.

If any part of the setup does not support 4K@120Hz, the signal may display at a lower resolution or may not display correctly.

IMPORTANT — BK-EX100C-K Supports 32Gbps Bandwidth, Not Full 48Gbps

The BK-EX100C-K supports 8Gbps per channel, with a total video bandwidth of 32Gbps.

It is HDMI 2.1 compliant, but the manual does not list full 48Gbps HDMI 2.1 bandwidth.

High-resolution formats such as 4K@120Hz depend on DSC support, source compatibility, display compatibility, and cable quality.

IMPORTANT — Use CAT 6 / CAT 7 Cable

The BK-EX100C-K extends the signal up to 100ft over CAT 6 / CAT 7 cable.

For best performance, use a high-quality CAT 6 or CAT 7 cable.

Poor-quality CAT cable may cause:

1. No video
2. Flickering
3. Black screen
4. Signal dropouts
5. 4K@120Hz not working
6. HDR issues
7. Audio dropouts

IMPORTANT — Use a Direct CAT Cable Connection

The BK-EX100C-K should be connected directly from the Sender RJ45 OUT port to the Receiver RJ45 IN port.

Do not connect the extender through:

1. Network switch
2. Router
3. Internet network
4. LAN switch
5. Ethernet wall network system 
    
   This product is not an AV-over-IP extender. The CAT cable is used as a direct signal extension cable between the Sender and Receiver.

IMPORTANT — DC 5V USB-C Power Input Is Available

The BK-EX100C-K includes a USB-A to USB-C power cable.

The Receiver has a DC 5V USB-C power input port.

If there is no video or the Receiver does not power properly, connect the included USB-A to USB-C power cable to the DC 5V port.

IMPORTANT — No HDMI Loop Out

The BK-EX100C-K does not include HDMI loop out.

It has:

1. USB-C input on the Sender
2. HDMI output on the Receiver 
    
   If a local display is needed near the laptop or PC, use the computer’s additional display output or a separate docking/display solution.

IMPORTANT — No IR or RS-232 Control

The BK-EX100C-K manual does not list IR IN, IR OUT, RS-232, or control pass-through ports.

This model is designed for USB-C video extension to an HDMI display.

If IR or RS-232 control extension is required, use a different extender model that includes those control ports.

Ports and Panel Layout

Step-by-Step Setup

1. Connect the USB-C Sender to the USB-C port of your laptop or PC. 
   Important: The USB-C port must support video output.
2. Connect the HDMI display to HDMI OUT on the Receiver. 
   Examples include a TV, monitor, projector, or commercial display.
3. Connect RJ45 OUT on the Sender to RJ45 IN on the Receiver using CAT 6 / CAT 7 cable.
4. Connect the included USB-A to USB-C power cable to the Receiver DC 5V port if power is required.
5. Power on the laptop or PC and HDMI display.
6. Select the correct HDMI input on the display.
7. Open the computer display settings and choose Duplicate, Extend, or Second Screen Only mode if needed.
8. Test video and audio.

CAT Cable Requirement — Critical

For best performance, use high-quality CAT 6 / CAT 7 cable.

Poor-quality, damaged, or incorrectly terminated CAT cable may cause:

1. No video
2. Flickering
3. Black screen
4. Signal dropouts
5. 4K@120Hz not working
6. HDR not working
7. Audio dropouts 
    
   Do not connect the CAT cable through a network switch or router.

HDMI Cable Requirement — Critical

Use a high-quality HDMI cable from the Receiver to the display.

For 4K@120Hz, use an HDMI cable that supports the required resolution and refresh rate.

Poor HDMI cables may cause:

1. No picture
2. Flickering
3. Black screen
4. 4K@120Hz not working
5. HDR not working
6. Audio dropouts
7. HDCP handshake issues 
    
   For troubleshooting, test the display directly with another HDMI source and try a shorter HDMI cable.

Understanding the Sender

The Sender is installed near the laptop or PC.

It has:

1. USB-C input for the source device
2. RJ45 OUT to connect to the Receiver 
    
   The Sender receives video from the USB-C source device. 
    
   Important: The laptop or PC USB-C port must support video output.

Understanding the Receiver

The Receiver is installed near the HDMI display.

It has:

1. RJ45 IN from the Sender
2. HDMI OUT to the display
3. DC 5V USB-C power input 
    
   The Receiver outputs the HDMI signal to the connected TV, monitor, or projector.

Understanding USB-C Video Output

USB-C is a connector type, but not every USB-C port supports video.

The BK-EX100C-K requires a USB-C port that can output video.

Compatible source devices may include:

1. Laptops with USB-C video output
2. PCs with USB-C video output
3. USB-C ports that support DP Alt Mode
4. USB-C ports designed for external monitors
5. Compatible gaming laptops
6. Compatible work laptops 
    
   If the laptop charges through USB-C but does not show video, the port may not support video output.

Understanding DP 1.4 Alt Mode

The BK-EX100C-K supports DP 1.4 Alt Mode.

This allows a compatible USB-C port to send video signal through the USB-C connection.

The connected laptop or PC must support this feature.

If the source does not support DP Alt Mode, the extender will not receive a video signal.

Understanding DSC 1.2a

The BK-EX100C-K supports DSC 1.2a.

DSC stands for Display Stream Compression.

This helps support high-resolution, high-refresh video formats such as 4K@120Hz over the available bandwidth.

The source and display must also support the required video format.

Supported Video and Audio

The BK-EX100C-K supports video formats including:

Supported audio formats include:

The connected source and display/audio device must also support the selected video and audio format.

What Source Devices Is the BK-EX100C-K Compatible With?

The OREI BK-EX100C-K is compatible with USB-C source devices that support video output, such as:

1. Laptops with USB-C video output
2. PCs with USB-C video output
3. USB-C devices with DP Alt Mode
4. Compatible gaming laptops
5. Compatible work laptops
6. Compatible desktop PCs with USB-C video output 
    
   The USB-C source must support external display output.

What Displays Is the BK-EX100C-K Compatible With?

The BK-EX100C-K can connect to HDMI displays such as:

1. 4K@120Hz TVs
2. Gaming monitors
3. 4K TVs
4. 1080p TVs
5. Projectors
6. Commercial displays
7. Conference room displays
8. Classroom displays
9. Digital signage displays 
    
   For 4K@120Hz, the display must support 4K@120Hz input.

Frequently Asked Questions

Q: What is the OREI BK-EX100C-K used for? 
A: The BK-EX100C-K is used to extend video from a USB-C laptop or PC to an HDMI display over CAT 6 / CAT 7 cable. It supports up to 4K@120Hz and extends the signal up to 100ft.

Q: Does the BK-EX100C-K support 4K@120Hz? 
A: Yes. It supports video resolutions up to 4K@120Hz.

Q: Does the BK-EX100C-K support 4K@60Hz? 
A: Yes. It supports 4K@60Hz.

Q: Does the BK-EX100C-K support 8K? 
A: No. The manual lists support up to 4K@120Hz.

Q: What HDMI version does it support? 
A: It supports HDMI 2.1.

Q: What HDCP version does it support? 
A: It supports HDCP 2.3.

Q: What video bandwidth does it support? 
A: It supports 32Gbps video bandwidth, listed as 8Gbps per channel.

Q: Does it support HDR? 
A: Yes. HDR10 is supported.

Q: Does it support DSC? 
A: Yes. It supports DSC 1.2a.

Q: Does it support DP Alt Mode? 
A: Yes. It supports DP 1.4 Alt Mode.

Q: How far can it extend video? 
A: It can extend the signal up to 100ft over CAT 6 / CAT 7 cable.

Q: What CAT cable should I use? 
A: Use high-quality CAT 6 or CAT 7 cable.

Q: Can I connect it through a network switch or router? 
A: No. The Sender and Receiver must be directly connected by CAT cable.

Q: Does the laptop USB-C port need to support video? 
A: Yes. The USB-C port must support video output, such as DP Alt Mode.

Q: Why am I not getting video from my laptop? 
A: Confirm that the laptop’s USB-C port supports video output. Also try changing the CAT cable, changing the HDMI cable, and lowering the resolution from the laptop or PC.

Q: Does the BK-EX100C-K need drivers? 
A: No. The manual states that no drivers or software are needed.

Q: Does the BK-EX100C-K have HDMI loop out? 
A: No. This model does not include HDMI loop out.

Q: Does it support IR control? 
A: No. The manual does not list IR control ports.

Q: Does it support RS-232? 
A: No. The manual does not list RS-232 control.

Q: What audio formats are supported? 
A: The manual lists LPCM, DTS, Dolby Digital, DTS-HD Master Audio, and Dolby TrueHD.

Q: Why is there no audio on the display? 
A: Try changing the audio format from the laptop or PC, try changing the CAT cable, and check the laptop audio output settings. Many laptops may continue outputting audio from the laptop speakers unless the HDMI display is selected as the audio output.

Q: What should I do if video keeps flickering or there is no video? 
A: Try changing the CAT cable, try changing the HDMI cable, and lower the resolution from the laptop or PC.

Q: Does the BK-EX100C-K need external power? 
A: The package includes a USB-A to USB-C power cable, and the Receiver has a DC 5V USB-C power input port. Connect the power cable to the Receiver if power is required.