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Black Ethernet extension cable with compact connector for ThinkPad laptops

Lenovo ThinkPad Ethernet Extension Cable 4X90F84315 Black

SKU CH-FHJD-V2K1B

Adds a wired 5 Gbps Ethernet port to compatible ThinkPad models including X1 Carbon and Yoga series

  • TypeNetwork Ethernet Cables
  • CatDesktop
  • ColorBlack
  • Sports Team1 Piece
  • FeaturesEthernet, 5 gigabits_per_second, ethernet
  • Adds wired networking to compatible ThinkPad laptops
  • Supports 5 Gbps Ethernet for fast data transfer
  • Enables PXE boot and vPro on X1 Carbon models
  • Compact form factor fits easily in a laptop bag
  • Designed for ThinkPad L380, X380 Yoga and X1 Carbon

What It Is

The Lenovo ThinkPad Ethernet Extension Cable 4X90F84315 is a compact black adapter that adds a wired RJ45 port to compatible ThinkPad ultraportables. It targets mobile professionals who need a reliable LAN link for docking, imaging or managed-network booting. The cable supports 5 gigabits_per_second throughput and works with PXE and vPro on listed X1 Carbon models.

When to Use It

Use this cable when a ThinkPad lacks a built-in Ethernet jack and Wi-Fi is unstable, prohibited or too slow for large deployments. It replaces the need for a bulky dock when only a single wired connection is required. The upgrade is worth it for IT teams that rely on PXE boot or vPro remote management on supported X1 Carbon, L380, X380 Yoga or Yoga 370 systems.

Install Notes

The adapter plugs directly into the proprietary ThinkPad Ethernet extension port on the laptop chassis; no driver installation is needed on modern Windows or Linux. The short tether keeps the RJ45 jack close to the body, reducing strain on the connector. Common issues arise when the cable is forced into a non-compatible model or when the port latch is damaged, preventing a secure click.

Highlights

  • Adds wired networking to compatible ThinkPad laptops
  • Supports 5 Gbps Ethernet for fast data transfer
  • Enables PXE boot and vPro on X1 Carbon models
  • Compact form factor fits easily in a laptop bag
  • Designed for ThinkPad L380, X380 Yoga and X1 Carbon

Specifications

BrandLenovo
TypeNetwork Ethernet Cables
CatDesktop
ColorBlack
Sports Team1 Piece
FeaturesEthernet, 5 gigabits_per_second, ethernet

Questions about this item

What connector does the 4X90F84315 cable use to attach to the ThinkPad?

The cable connects to the ThinkPad OneLink docking port on supported models.

Which step is most often missed when installing this extension cable?

Users often forget to enable the Ethernet option in BIOS before the PXE boot or vPro features will work.

What part of this cable is most likely to need replacement after heavy use?

The RJ45 jack and the OneLink plug endure the most insertions, so they wear out first.

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