---
title: kIOPropertyPortSpeedKey
framework: DriverKit
role: symbol
role_heading: Macro
platforms: [DriverKit 20.0+, macOS 10.3+]
path: kernel/kiopropertyportspeedkey
---

# kIOPropertyPortSpeedKey

## Declaration

```occ
#define kIOPropertyPortSpeedKey
```

## Discussion

This key is associated with the current port speed. The port speed can be any valid speed for the interconnect.

Note: This value can change. It is not a static value.

Requirement: Optional for any interconnect.

Example:

```occ
 
 
<dict>
   <key>Controller Characteristics</key>
   <dict>
   	<key>Port Speed</key>
   	<string>Automatic (1 Gigabit)</string>
   </dict>
</dict>
```