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

# kIOPropertyFibreChannelALPAKey

## Declaration

```occ
#define kIOPropertyFibreChannelALPAKey
```

## Discussion

This key is the 8-bit Arbitrated Loop Physical Address (AL_PA) value as defined in the FC-AL-2 specification.

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

Requirement: Optional (only necessary for Fibre Channel Interface).

Example:

```occ
 
 
<dict>
   <key>Protocol Characteristics</key>
   <dict>
   	<key>Physical Interconnect</key>
   	<string>Fibre Channel Interface</string>
   	<key>Physical Interconnect Location</key>
   	<string>External</string>
   	<key>AL_PA</key>
   	<data>04</data>
   </dict>
</dict>
```

Example2:

```occ
 
 
<dict>
   <key>Controller Characteristics</key>
   <dict>
   	<key>AL_PA</key>
   	<data>04</data>
   </dict>
</dict>
```