Front Panel I/O Connectivity Design Guide

Table 22. IEEE 1394B Cable and Connector Pin Assignments

Signal AWG Pairing

P1 / P2

TPA+ 28 A 1 /1

TPA- 28 A 2 /2

TPA_REF SHIELD 3 /3

TPB_REF SHIELD 4 / 4

TPB+ 28 B 5 / 5

TPB- 28 B 6 /6

+12V(Fused) 20 7 /7

+12V(Fused) 20 8 /8

KEY N/A 9/9

GND 20 10/10

GND SHIELD 10/10

CAUTION

Since the 1394 front panel headers are keyed the same, care should be taken to ensure a valid

configuration.

Table 23 shows the results of different configurations.

Table 23. Header Port to Cable I/O Board Configuration Chart

1394 Front

Panel Header

Port

Configuration

1394 Front

Panel Cable I/O

Board

Configuration

Result

1394A 1394A Valid Configuration

1394B 1394B Valid Configuration

1394A 1394B INVALID CONFIGURATION. 1394B devices with a Beta-only

port will not operate and 1394B devices with a Bilingual port will

operate in 1394A mode.

1394B 1394A INVALID CONFIGURATION. 1394A devices will operate in

1394A mode if a Bilingual Mode 1394B host controller is used.

1394A devices will not operate if a Beta-only Mode 1394B host

controller is used. 1394B devices will try to operate in 1394B

Beta mode, but may have link problems since the 1394A

connector is not rated for 1394B signal speeds.