MST mode and SST mode are two technical terms frequently mentioned in Windows and Apple enthusiast communities. To help everyone better understand these two protocols, we have specially created some relevant images. Here's a detailed introduction.
Multi-Stream Transport (MST) Mode
(A) Basics of MST Mode
Multi-Stream Transport mode is based on DisplayPort technology and is specifically designed for video output specifications of DisplayPort 1.2 or higher versions. When using DisplayPort 1.2, 1.3, and 1.4, MST mode can fully demonstrate its advantages.
(B) Functions of MST Mode
MST allows the transmission of signals from a single desktop or laptop host to multiple independent video displays. With the help of MST hubs and displays that support daisy-chaining, multi-display expansion functions can be achieved, while the GPU driver controller is responsible for handling the additional workload. There are two main ways to design MST systems: using MST hubs or displays that support daisy-chaining.
(C) Display Modes under MST Mode
Mirror Mode: This mode simply replicates the host desktop image onto auxiliary or additional displays connected to the host.
Extended Mode: In extended mode, the desktop can be extended across multiple displays to maximize the utilization of workspace. All displays can have different screen resolutions, refresh rates, and screen orien-tations (landscape or portrait). Extended mode is the most commonly used mode in MST setups.
(D) MST Daisy-Chaining
"Daisy-chaining" is an emerging term that refers to the ability to connect multiple displays in series using a single connection between at least two devices. DP v1.2 has the capability to receive video input and output. The host video output device can be connected to a second display, which in turn can be directly connected to a third display. Daisy-chaining connections can minimize cable clutter and expand the display range of the host device.
Single-Stream Transport (SST) Mode
Single-Stream Transport mode is also based on DisplayPort technology. SST mode only allows one external downstream device to transmit through a single downstream port at a time. However, it can extend a second screen and mirror it onto other displays. Currently, the macOS platform supports SST mode.
