FireWire: Pin Assignments

This article provides the pin assignments, also known as pinouts, for the FireWire connector used on some Apple computers.

Pin
Signal name
Description
1
PowerUnregulated DC; available voltage depends upon product
2
GroundGround return for power and inner cable shield
3
TPB-Twisted-pair B, differential signals
4
TPB+
5
TPA-Twisted-pair A, differential signals
6
TPA+
Shell
--Outer cable shield
Published Date: Feb 20, 2012