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Appendix A Specifications 81
USB Specifications
 Support for Universal Serial Bus (USB) 2.0 and 1.1
 Five external USB Type A ports
 One USB 2.0 port on the front
 Two USB 2.0 ports on the back
 Two USB 1.1 ports on the Apple Keyboard
 Each rear port is on a separate 480 megabit-per-second (Mbps) USB channel
 500 milliamperes (mA) at 5 V are available for each USB 2.0 port, for a total of
1.5 amperes
FireWire Specifications
 Support for FireWire 400 and FireWire 800
 Three external FireWire ports
 One FireWire 400 port on the front
 One FireWire 400 and one FireWire 800 port on the back
 Data transfer speed:
 FireWire 400: 100, 200, and 400 Mbps
 FireWire 800: 100, 200, 400, and 800 Mbps
Power
 Output voltage: Approximately 13 to 25 V
 Output power: Up to 15 W
Ethernet Specifications
 IEEE 802.3 compliant
 Maximum cable length: 100 meters (m)
 Protocols: Open Transport, AppleShare, AppleTalk, NetWare for Macintosh, TCP/IP
 Connector: RJ-45 for 10Base-T, 100Base-TX, and 1000Base-T
 Media, 10Base-T: Category 3 or higher UTP on 2 pairs up to 100 m
 Media, 100Base-TX: Category 5 UTP on 2 pairs up to 100 m
 Media, 1000Base-T: Category 5 and 6 UTP on 4 pairs up to 100 m
 Channel speeds: IEEE Auto Negotiation of 10Base-T, 100Base-TX, and 1000Base-T
Modem Specifications
 Data communications standard: K56Flex and V.92
 Speed: 53 kilobits per second (Kbps)
 Fax standard: ITU V.17
LL3218Q87.book Page 81 Wednesday, March 16, 2005 6:28 PM