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IEEE 1394 Fundamentals and Interface Overview 61Chapter 4
The Adaptec
®
AHA-8940 Host
Adapter and
Interface Cable
The Adaptec
®
AHA-8940 1394-to-PCI host adapter is a PC plug-in card
1
capable of transferring data at up to 400 MBits/second. The adapter has one
internal and two external 1394 ports. Each AHA-8940 represents one bus
segment capable of supporting up to 63 nodes. If required, the AHA-8940
can supply 12V at up to 1.5A for IEEE 1394 devices that require power.The
layout of the adapter is shown below.
The interface cable supplied with the host adapter has two power wires and
two signal twisted-pairs. A cross-section of the cable and the cable
connector are shown in Figure 4-4.
1. In the future, IEEE 1394 will be a standard port on selected PCs.
Figure 4-3. Layout of the Adaptec
®
AHA-8940 1394-to-PCI Host Adapter.
Internal IEEE 1394 connector
12 VDC power connector
External
IEEE 1394
connectors