100Ft Plenum Rated HDMI Cable CMP - 8K 48Gbps Fiber Optic HDMI 2.1

In this review of the 100ft Plenum Rated HDMI Cable CMP, the bottom line is practical: this long HDMI 2.1 fiber optic cable is aimed at installations that need reliable long runs in walls, ceilings or conduits and a path to 8K/4K UHD video. The reviewer found the cable's plenum CMP jacket and active fiber construction make it well suited for commercial AV runs and permanent home installations, while the one-way active design and mixed user reports about eARC mean installers should check device compatibility before committing to a hidden run.

Key Features

• 8K 48Gbps bandwidth: Supports 8K@60Hz and 4K@120Hz for future-proof high resolution and high frame rate sources.
• Fiber optic construction: Optical fiber transmission reduces electromagnetic interference and keeps long runs stable compared with copper alternatives.
• Plenum rated jacket: CMP fire rated PVC jacket and strain relief permit installation in walls, ceilings, ducts and conduits for commercial and home use.
• Active, one-way design: Built-in electronics enforce one-way transmission from source to display, which keeps signal integrity over 100 ft but requires correct orientation.
• Wide protocol support: Compatible with Dynamic HDR10, eARC, ALLM, VRR and HDCP 2.2/2.3 for modern AV features when devices interoperate.
• Backwards compatibility: Works with older HDMI versions so it can be used with a variety of players, PCs and displays.

Who It's For

This cable is for integrators, AV installers and homeowners who need to run a single HDMI link over long distances through plenum spaces and want an HDMI 2.1 capable fiber solution that supports 8K and 4K high frame rate signals. It is attractive when concealment, fire rating and long-run signal integrity are priorities.

It is not ideal for casual users who expect simple plug-and-play parity for every advanced feature; because the cable is active and one-way, features such as audio return may depend on device compatibility and correct cable orientation, so users who need guaranteed eARC behavior should verify with their source and display first.

Pros & Cons

Pros

• Supports ultra high speed 48Gbps for 8K@60Hz and 4K@120Hz video over long distances.
• Plenum CMP jacket and strain relief allow safe in-wall and ceiling installations in commercial settings.
• Optical fiber construction offers strong antiinterference performance for stable signal over 100 ft.
• Broad protocol support covers HDR, VRR and HDCP for modern content and consoles.

Cons

• Active one-way transmission requires correct orientation and may cause compatibility issues with some eARC setups based on user reports.
• As an active fiber cable it depends on smart electronics at the ends, which can complicate troubleshooting compared with passive copper cables.

Specifications

Length	100 ft (30 m)
Cable type	Fiber optic Ultra High Speed HDMI 2.1
Bandwidth	48 Gbps
Resolution support	8K@60Hz, 4K@120Hz
Fire rating	CMP plenum rated jacket
Features supported	Dynamic HDR10, eARC, ALLM, VRR, 4:4:4 RGB, HDCP 2.2/2.3
Connector	HDMI male to HDMI male, one-way active

Our Verdict

The 100ft Plenum Rated HDMI Cable CMP is a sensible choice when you need a long, concealed HDMI 2.1 run with a plenum fire rating and low interference. Installers and owners who confirm device compatibility for one-way active operation will find it a durable, future-capable solution for 8K and 4K installations, but anyone relying on guaranteed eARC behavior should test first before finalizing a hidden install.

Frequently Asked Questions

Is this cable suitable for in-wall installation?
Yes, it has a CMP plenum rated PVC jacket and strain relief designed for walls, ceilings, ducts and conduits.

Will eARC always work over this cable?
eARC is supported by the cable, but some users report inconsistent audio return behavior depending on device compatibility and orientation; verify with your equipment before installation.

Do I need to worry about cable direction?
Yes, this is an active one-way HDMI cable; make sure the source end connects to the cable end labeled for source and the display to the display end.