H3C Technologies H3C MSR 20-2X[40] - Manual (Page 29)

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NOTE:
MDI (media dependent interface is a typical type of Ethernet interface provided by network adapters.
MDIX is crossover media-dependent interface, which is commonly found on a Hub or LAN switch.
Ethernet cable
Ethernet interfaces usually use category 5 twisted pair cables, as shown in the following figure:
Figure 15 Ethernet cable
Ethernet cables fit into the following two categories:
• Standard cable, also called straight-through cable, at both ends of which, wires are crimped in the
RJ-45 connectors in the same sequence. The cable connects different categories of devices, such as
a terminal device (PC for example) or router to a Hub or LAN switch. The cable accompanying the
router is straight-through cable.
• Crossover cable, at both ends of which, wires are crimped in the RJ-45 connectors in different
sequences. The cable connects the same category of devices, such as PC to PC or PC to router. You
can make crossover cables yourself as needed.
NOTE:
In making network cables, shielded cables are preferred for electromagnetic compatibility sake.
Connecting the Ethernet cable
Follow the steps below to connect an Ethernet cable:
Step1 Connect one end of the Ethernet cable to an Ethernet port on the router and the other end to another
device.
• For a 10/100 Mbps port provided by the RPU, connect it to a PC or another router using a crossover
cable or to a Hub or LAN switch using a straight-through cable.
Step2 View the LINK LED of the Ethernet interface: ON means a link is present.
Connecting AUX to a Modem
AUX port
AUX is an RS232 asynchronous serial interface, which can back up a WAN interface and provide dial
connection. In case of console failure, AUX can function as a console interface.
AUX cable
AUX cable is an eight-wire shielded cable. At one end of the cable is an RJ-45 connector for connecting
the console port on the router. At the other end are DB-9 (male) connector and DB-25 (male) connector.
You can plug either of them into the serial port on a modem as needed.