GPMI

{{Short description|Digital audiovisual data interface}}{{Infobox connector

| name = GPMI
General Purpose Media Interface

| type = Digital audio/video/data connector

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| hotplug = Yes

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| video_signal = Maximum resolution limited by available bandwidth

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General Purpose Media Interface (GPMI) is an upcoming standard for an audio/video interface for transmitting uncompressed video data and compressed or uncompressed digital audio data from a source device, such as a display controller, to a computer monitor, video projector, digital television, or digital audio. GPMI is intended to be a successor to HDMI developed by Chinese companies.

The GPMI standard will be released in phases: home entertainment, automotive/transportation, and industrial applications.{{Cite web |title=China's General Purpose Media Interface "GPMI" set to deliver up to 192Gbps of bandwidth and 480W power through a single USB cable |url=https://videocardz.com/newz/chinas-general-purpose-media-interface-gpmi-set-to-deliver-up-to-192gb-of-bandwidth-and-480w-power-through-a-single-usb-cable |access-date=2025-04-06 |website=VideoCardz.com |language=en-US}} GPMI is developed by the Shenzhen 8K UHD Video Industry Cooperation Alliance (SUCA) that includes over fifty Chinese member companies, including Huawei, Skyworth, Hisense, and TCL.{{Cite web |author1=Jowi Morales |date=2025-04-06 |title=China launches HDMI and DisplayPort alternative — GPMI boasts up to 192 Gbps bandwidth, 480W power delivery |url=https://www.tomshardware.com/tech-industry/china-launches-hdmi-and-displayport-alternative-gpmi-boasts-up-to-192-gbps-bandwidth-480w-power-delivery |access-date=2025-04-06 |website=Tom's Hardware |language=en}}{{Cite web |title=中國推出自己的 GPMI 接口規格 支援 480W 供電 192Gbps 頻寬 |url=https://www.hkepc.com/23403/%E4%B8%AD%E5%9C%8B%E6%8E%A8%E5%87%BA%E8%87%AA%E5%B7%B1%E7%9A%84_GPMI_%E6%8E%A5%E5%8F%A3%E8%A6%8F%E6%A0%BC_%E6%94%AF%E6%8F%B4_480W_%E4%BE%9B%E9%9B%BB__192Gbps_%E9%A0%BB%E5%AF%AC |access-date=2025-04-06 |website=HKEPC Hardware}}{{Cite web |last=财经头条 |title=中国高清视频接口GPMI发布,支持480W大功率快充 |url=https://t.cj.sina.com.cn/articles/view/1677177940/63f7b45401901e3ag |access-date=2025-04-06 |website=t.cj.sina.com.cn}} It is unclear whether GPMI will be a free standard or whether manufacturers will be required to pay a license fee as with HDMI.{{cite web |date=7 April 2025 |title=GPMI is a Chinese alternative to HDMI and DisplayPort with up to 192 GBPS bandwidth, 480W Power Delivery - CNX Software |url=https://www.cnx-software.com/2025/04/07/gpmi-is-a-chinese-alternative-to-hdmi-and-displayport-with-up-to-192-gbps-bandwidth-480w-power-delivery/}}

Specifications

GPMI supports data transmission rates up to 192 Gbps, accommodating ultra-high-definition video content such as 8K at 120 frames per second. It can power devices with up to 480 W of power.{{Cite web |date=2025-04-10 |title=What is GPMI, the new standard that may make HDMI, Thunderbolt and DisplayPort obsolete? |url=https://indianexpress.com/article/technology/tech-news-technology/gpmi-general-purpose-media-interface-vs-hdmi-thunderbolt-usb-displayport-9932681/ |access-date=2025-04-10 |website=The Indian Express |language=en}} GPMI combines multiple signal types—including information flow, control signals, power supply, and audio/video—into a single cable, simplifying connectivity. It utilizes a sideband interaction channel to reduce device wake-up times to a quarter of those in comparable technologies. GPMI enables multi-channel bidirectional video transmission and mesh networking. GPMI operates in two modes.

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colspan="1" |GPMI Type-B

| colspan="1" |192 Gbps

| colspan="1" |480W

|Uses a proprietary connector.

colspan="1" |GPMI Type-C

| colspan="1" |96 Gbps

| colspan="1" |240W

|Uses USB-C connector. Same power limit as the Extended Power Range (EPR) standard.

= Security =

GPMI supports the ADCP content protection protocol. ADCP is based on China's national security cryptographic algorithms, including SM3 and SM4.{{Cite web |title=GPMI:一线通联,创新无界 |url=https://www.hisilicon.com/cn/White-Paper-Technical-Guide/white-paper/gpmi-innovation |access-date=2025-04-08 |website=www.hisilicon.com |language=zh}} ADCP will feature frame-level encryption. Authentication is claimed to be faster than HDCP. ADCP will feature secure communication between devices in a multi-node configuration. Two devices in a chain can communicate securely even with another device connected in between, reducing man-in-the-middle attacks.

= Control =

GPMI will include the ability to control connected devices, similar to HDMI-CEC.

= Network =

GPMI will be able to carry network traffic, removing the need for connected devices to connect directly to the network.

= Link types =

  • Main Link (ML) – Supports 4-channel and 8-channel transmission. Each channel can contain 24 Gbps of unidirectional data. For example, in 8+0 configuration, 8 channels (192 Gbps) are dedicated to forward transmission with 0 channels to reverse transmission. In 6+2 configuration, 6 channels (144 Gbps) are dedicated to forward transmission with 2 channels (48 Gbps) dedicated to reverse transmission.
  • Sideband Link (SL) – management of devices, ports, and bandwidth
  • CableInfo Link (CL) – cable insertion and hot plug detection
  • Power Link (PL) – bidirectional power supply
  • USB2.0 Link (UL) – USB protocol ecosystem

See also

References

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