USB4 (USB4/TBT3 Sideband (SB) Channel) can simultaneously transmit DisplayPort video and PCIE signals through Intel Tunneled technology, and also support PD (Power Delivery) fast charging technology.
USB4 is backward compatible with USB 2.0 and USB 3.2 Gen1/Gen2 and supports Thunderbolt 3/4. The sideband channel (SB) was originally defined as a channel for video protocol communication after entering the Alt-Mode (Alternate Mode) in USB 3.2 (for example: DP Alt-Mode transmits AUX signals through the Sideband channel...etc.). In the USB4 specification, new features of Sideband channel are added to confirm whether the USB4 interface is connected, start and close the channel, initialize the channel, and enter or leave the sleep mode. Thunderbolt Alt-Mode will be enabled when connecting to the device via Thunderbolt 3.
Application: The connection between the USB4/TBT3 Ports of two interconnected Routers that provides initial communication and setup functionality.
Signal: Sideband Transactions are sent over SBTX and received over the SBRX
Voltage: 3.3V
Its function is to assist in the communication of high-speed signal transmission, mainly for the following purposes:
‧ Negotiate Link Parameters
‧ Lanes
‧ Gen
‧ Coding
‧ Lane Equalization Management
