Connecting Router To The Lan - 3Com 3C13701 Installation Manual

28 C 4: I
HAPTER NSTALLATION OF THE
Connecting Router
to the LAN
R
OUTER
Introduction to the Ethernet Interface
3Com 5000 Routers provide fixed 100BASE-TX FE interface(s). For the interface
attributes, refer to Table 14.
Table 14 Attributes of the Ethernet interface
Attribute
Connector
Interface
Operating mode
Ethernet MDI (Media Dependent Interface) is the typical Ethernet interface on ordinary
network cards. MDIX is crossover media-dependent interface, which is generally used on
Hubs or LAN switches.
Ethernet Cable
100BASE-TX Ethernet interface usually uses Category-5 twisted pair as shown in the
following figure:
Figure 16 Ethernet cable assembly
The Ethernet cables are classified into straight-through cable and crossover cable. They
are introduced respectively as follows:
The wire sequences of the twisted pair cable crimped by the RJ45 connectors at both
■
ends of the cable are totally the same. It is used to connect the terminal equipment,
such as PCs and routers to HUBs or LAN Switches.
The wire sequences of the twisted pair wires crimped by the RJ45 connectors at both
■
ends of the cable are different. It is used to connect the terminal equipment (such as
PCs) to the terminal equipment (such as PCs). If needed, you can make such cables
yourself.
CAUTION: When making the cable, use the shielded cable to ensure EMC
(Electromagnetic Compatibility).
Connection of the Ethernet Cable
CAUTION:
Prior to connection, please identify the mark on the interface in order to plug
■
correctly.
While connecting the Ethernet cable to a LAN Switch, plug the cable into the
■
10/100BASE-T interface marked with MDIX.
Description
RJ45
MDI
10/100Mbps auto-sensing
Full duplex/half duplex