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21 Chapter 2
127 external devices. The USB interfaces comply with USB specification
Rev. 1.1, and are fuse protected.
The USB interface is accessed through the 5 x 2-pin flat-cable connector,
CN6 (USB1, 2). You will need an adapter cable if you use a standard
USB connector. The adapter cable has a 5 x 2-pin connector on one end
and a USB connector on the other.
The USB interfaces can be disabled in the system BIOS setup.
2.17 Ethernet configuration
The PCA-6774 is equipped with a high performance 32-bit PCI-bus
Ethernet interface which is fully compliant with IEEE 802.3u 10/
100Mbps CSMA/CD standards. It is supported by all major network
operating systems.
The PCA-6774 supports 10/100Mbps Ethernet connections with onboard
RJ-45 connectors (CN8).
2.17.1 100Base-T connector (CN8)
10/100Base-T connects to the PCA-6774 via an adapter cable to an 8-pin
polarized header (CN8).
2.17.2 Network boot
The Network Boot feature can be utilized by incorporating the Boot
ROM image files for the appropriate network operating system. The Boot
ROM BIOS files are included in the system BIOS, which is on the utility
CD disc.
2.18 Power connectors (CN14, CN15)
2.18.1 Main power connector, +5 V, +12 V (CN15)
Supplies main power to the PCA-6774 (+5 V), and to devices that require
+12 V.
2.18.2 CPU Fan power supply connector (CN14)
Provides power supply to CPU cooling fan. Only present when +12 V
power is supplied to the board.