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Specifications and
Cabling Requirements
This appendix lists the specifications, standards conformance, cable requirements, and
connector pin assignments for the 3Com 10/100 PCI NIC.
3C990B NIC Specifications
The following table provides environmental, interface, and standards information for the
3Com 10/100 PCI NIC with 3XP processor (3C990B family).
Hardware
Memory 128 KB external RAM
Bus interface PCI Local Bus Specification, Revision 2.2
32-bit bus
PCI master Supports bus master scatter-gather DMAs.
Dimensions Length: 13.31 cm (5.24 in)
Height: 8.51 cm (3.35 in)
Power requirement +5 V ±5% operating 1.26A maximum for normal operation (375
mA for low power mode)
Network Interface
10 Mbps Ethernet 10BASE-
T
Ethernet IEEE 802.3 industry standard for a 10 Mbps baseband
CSMA/CD local area network
100 Mbps Ethernet
100BASE-TX
Ethernet IEEE 802.3u industry standard for a 100 Mbps baseband
CSMA/CD local area network
Environment
Operating temperature 32˚ to 158˚ F (0˚ to 70˚ C)
Storage temperature –22˚ to 194˚ F (–30˚ to 90˚ C)
Operating humidity 10 to 90% noncondensing
Storage humidity 10 to 90% noncondensing
Altitude –300 to 3,000 m (–984 ft to 9,840 ft)
Standards Conformance
IEEE 802.3 10BASE-T
IEEE 802.3u 100BASE-TX
IEEE 802.3x full-duplex, auto negotiation, and flow control
IEEE 802.1p (General Attribute Registration protocol) for multicast addresses
IEEE 802.1Q VLAN Tagging
(continued)