---
title: kIOUSBLinkSpeed40Gbps
framework: USBDriverKit
role: symbol
role_heading: Enumeration Case
platforms: [driverkit 19.0+]
path: usbdriverkit/kiousblinkspeed40gbps
---

# kIOUSBLinkSpeed40Gbps

## Declaration

```occ
kIOUSBLinkSpeed40Gbps
```