1
INTRODUCTION
The 3Com
® 
3C905B-TX network interface card (NIC) 
provides a high-performance connection to an Ethernet or 
Fast Ethernet network. This NIC operates at 100 Mbps or 
10 Mbps automatically, depending on the speed of the 
connected hub.
Figure 1-1   3C905B-TX NIC
There are two types of 3C905B-TX NICs: the 3C905B-TX NIC 
and the 3C905B-TX-NM NIC.
The 3Com
 
Remote Wake-Up NIC (3C905B-TX), shown in 
Figure 1-1, operates as a wake-up NIC only in PCs with the 
Remote Wake-Up connector attached to the PC 
motherboard. This NIC provides a network connection with 
or without the Remote Wake-Up connector installed.
The 3C905B-TX-NM NIC does not have the Remote Wake-Up 
connector or functionality.
DATA
TX
ACT
10
100
L
N
K
Book  Page 1  Thursday, April 2, 1998  9:28 AM