H3C Technologies H3C MSR 20-1X - Manual (Page 32)

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Layer 2 Ethernet interface attributes
MSR 20-1X routers each provide fixed 100Base-TX Layer 2 Ethernet interfaces. The following table
describes the attributes of Layer 2 Ethernet interfaces.
Table 18 Attributes of Layer 2 Ethernet interfaces
Item Description
Connector RJ45
Interface type MDI/MDIX
Frame format
Ethernet_II
Ethernet_SNAP
Operating mode
10/100 Mbps autosensing
Half duplex/full duplex
NOTE:
Media dependent interface (MDI) is a typical Ethernet interface provided by network adapters, while
media-dependent interface crossover (MDIX) is an interface commonly found on a hub or LAN switch.
Ethernet cable
Electrical Ethernet interfaces usually use category-5 twisted pair cables to connect Ethernet networks, as
shown in the following figure:
Figure 21 Ethernet cable
Ethernet cables fall into the following two categories:
• Standard cable, also called straight-through cable. At both ends of the standard cable, wires are
crimped in the RJ-45 connectors in the same sequence. A straight-through cable is used to connect
a terminal device (for example, a PC or router) to a HUB or LAN Switch. The cables delivered with
the router are standard cables.
• Crossover cable: at both ends of a crossover cable, wires are crimped in the RJ-45 connectors in
different sequences. A crossover cable used to connect a terminal device (for example, (PC or router)
to another terminal device. You can make crossover cables by yourself.
NOTE:
In making network cables, shielded cables are preferred for electromagnetic compatibility sake.
Connecting the Ethernet cable
Follow these steps to connect an Ethernet cable:
Step1 Connect one end of the Ethernet cable to an Ethernet interface on the router and the other end to the peer
device. For a 10/100 Mbps Ethernet interface that supports MDI/MDIX autosensing, you can use a
straight-through cable or crossover cable to connect the interface to a hub or LAN Switch.