Design
Product colour	Black
Internal
Logistics data
Harmonized System (HS) code	85176990
Ports & interfaces
Connectivity technology	Wired
Host interface	USB Type-C
Interface	Ethernet
Ethernet LAN (RJ-45) ports	1
Weight & dimensions
Weight	44 g

The Lenovo USB-C to Ethernet adapter, type CABL, manufacturer number 4X90S91831, is an external networking accessory for notebooks and tablets with a USB-C port. It enables connection to a wired Gigabit Ethernet network via an RJ-45 connector. The device is black and serves as a supplement for devices lacking an integrated network connection, particularly for models from the ThinkPad and ThinkBook series as well as ThinkCentre stations. The connection is made via the host interface USB Type-C, allowing use with compatible end devices.

Applications

The adapter is designed for use in office environments, home offices, and IT administration tasks. It is especially suitable for tasks requiring a stable and fast network connection, such as system imaging or transferring large data volumes. Its compact design and plug-and-play functionality facilitate use while traveling or in mobile work environments.

Functions and Equipment in Detail

The device features a single Ethernet LAN port (RJ-45) and is designed as external accessory, not integrated into the end device. The transmission technology is wired, requiring a direct physical connection to the network. The USB Type-C host interface enables connection to modern devices supporting this port. The adapter is black, allowing seamless integration into work environments.

Technology Explained Simply

The adapter acts as a bridge between the USB-C port of the end device and the Ethernet network. Data transfer and power supply (if required) are handled via the USB-C cable. The RJ-45 interface allows connection to a network cable (Cat 5e, Cat 6 or higher), which is connected to a switch, router, or network socket.

Compatibility and Accessories

The adapter is intended for ThinkPad models such as the X1 Carbon (7th generation), E15, as well as ThinkBook 13, 14, 15, and ThinkCentre M75. Compatibility with other USB-C-enabled devices is also available, provided the operating systems support the required drivers.

Installation and Mounting

Installation is done by simply plugging the USB-C end into the corresponding port on the device and connecting the RJ-45 connector to a network cable. Most operating systems automatically detect the adapter and install the necessary drivers without additional user input.

Advantages in Operation

The adapter provides a reliable and stable network connection independent of WLAN signals. This is particularly beneficial in environments with high network load or when transferring large data volumes. The compact design and low weight of 44 g enable easy portability and use on the go. The plug-and-play functionality reduces setup time and simplifies the user experience.