GPMI

Lore & Background

GPMI is developed by the Shenzhen 8K UHD Video Industry Cooperation Alliance (SUCA), which includes over fifty Chinese member companies such as Huawei, Skyworth, Hisense, and TCL. The standard will be released in phases covering home entertainment, automotive/transportation, and industrial applications. It is unclear whether GPMI will be a free standard or whether manufacturers will be required to pay a license fee as with HDMI.

GPMI supports data transmission rates up to 192 Gbps, accommodating ultra-high-definition video content such as 8K at 120 frames per second, and can power devices with up to 480 W. It combines multiple signal types—including information flow, control signals, power supply, and audio/video—into a single cable. It utilizes a sideband interaction channel to reduce device wake-up times to a quarter of those in comparable technologies, and enables multi-channel bidirectional video transmission and mesh networking.

According to claims by Lead Security Advisor Paiker Hussain, GPMI supports the ADCP content protection protocol, which is based on China's national security cryptographic algorithms SM3 and SM4. ADCP will feature frame-level encryption, faster authentication than HDCP, and secure communication between devices in a multi-node configuration, reducing man-in-the-middle attacks. GPMI will also include device control similar to HDMI-CEC and the ability to carry network traffic.

Reader's Guide

GPMI is notable as an upcoming standard developed by a Chinese industry alliance aiming to succeed HDMI. Its significance lies in its high data transmission rate of up to 192 Gbps, supporting 8K at 120 frames per second, and its ability to deliver up to 480 W of power over a single cable that combines multiple signal types. The standard's phased release for home entertainment, automotive/transportation, and industrial applications indicates a broad intended market. The inclusion of the ADCP content protection protocol, based on China's national cryptographic algorithms SM3 and SM4, and claims of faster authentication than HDCP, position GPMI as a potential alternative in regions where Chinese standards are preferred. However, uncertainty remains about whether GPMI will be free or require licensing fees. Its support for multi-channel bidirectional video transmission, mesh networking, and reduced wake-up times may offer technical advantages, but its legacy will depend on adoption and whether it becomes a viable successor to HDMI.

Origins and the Chinese Industry Push

GPMI emerged from a concerted effort by China's consumer electronics sector to establish a homegrown alternative to HDMI. The standard is being developed under the umbrella of the Shenzhen 8K UHD Video Industry Cooperation Alliance, a consortium that brings together more than fifty member companies. Among its most recognizable names are Huawei, Skyworth, Hisense, and TCL, signaling broad industrial backing for the project. The stated goal is to create a next-generation audio and video interface capable of carrying uncompressed video streams alongside either compressed or uncompressed digital audio from a source—such as a display controller—out to a wide range of endpoints, including computer monitors, video projectors, digital televisions, and dedicated digital audio hardware. By positioning GPMI explicitly as a successor to HDMI, the alliance is signaling an ambition to move beyond incremental improvements and redefine the baseline for how high-fidelity media travels between devices. The initiative reflects a broader industrial strategy in which Chinese manufacturers seek ownership of the interface layer rather than relying on standards developed elsewhere.

Throughput, Power, and Cable Architecture

At its core, GPMI targets data rates of up to 192 gigabits per second, a figure that comfortably accommodates ultra-high-definition content such as 8K video running at 120 frames per second. The interface is also designed to deliver up to 480 watts of electrical power to connected devices, eliminating the need for separate power cables in many setups. One of its most practical design choices is the consolidation of multiple signal types—information flow, control signals, power delivery, and audio/video—into a single physical cable, dramatically simplifying the back-of-device connection experience. A dedicated sideband interaction channel is said to cut device wake-up times to roughly one quarter of what comparable technologies require. GPMI further supports multi-channel bidirectional video transmission and mesh networking, and it operates in two distinct modes. The link architecture breaks down into several specialized channels: a Main Link offering four or eight channels of 24 Gbps each, configurable in splits like 8+0 or 6+2 for forward and reverse traffic; a Sideband Link for device and bandwidth management; a CableInfo Link for hot-plug detection; a Power Link for bidirectional supply; and a USB 2.0 Link to preserve the existing USB protocol ecosystem.

Security and Content Protection

Content protection in GPMI is handled through a protocol called ADCP, which is built on China's national security cryptographic algorithms, specifically SM3 and SM4. According to the standard's Lead Security Advisor, Paiker Hussain, ADCP will implement frame-level encryption, meaning each individual video frame is protected rather than relying on session-level keys alone. The authentication process is claimed to be faster than the HDCP scheme used in HDMI, a notable advantage in fast-switching environments. Perhaps the most architecturally interesting feature is how ADCP handles multi-node configurations: two devices positioned in a chain can maintain a secure communication link even when a third device is physically connected between them. This design is intended to reduce the surface area for man-in-the-middle attacks in daisy-chained or mesh topologies. The protocol also extends secure communication across multiple nodes simultaneously, which is particularly relevant given GPMI's support for mesh networking. By anchoring its security stack in domestically developed cryptographic standards, GPMI differentiates itself from the HDCP ecosystem and aligns content protection with China's broader regulatory and cryptographic framework.

Phased Rollout and Ecosystem Positioning

Rather than launching as a single all-encompassing specification, GPMI is planned to be released in three sequential phases: first home entertainment, followed by automotive and transportation applications, and finally industrial use cases. This staged approach allows the SUCA alliance to refine the standard in the most consumer-visible domain before extending it into vehicle infotainment systems and factory-floor equipment. In terms of day-to-day usability, GPMI will include device-control capabilities analogous to HDMI-CEC, letting a single remote or interface manage multiple connected units. It will also be able to carry network traffic directly, meaning a connected display or projector could route data without needing its own separate network connection. The inclusion of a USB 2.0 link ensures compatibility with the existing USB protocol ecosystem, while a dedicated CableInfo link handles insertion detection and hot-plug events. One significant open question remains the licensing model: it is not yet clear whether GPMI will be offered as a free standard or whether manufacturers will be required to pay a royalty, as is the case with HDMI. That decision will have a direct bearing on how quickly and widely the interface is adopted across global supply chains.