H3C Technologies H3C MSR 50 - Manual (Page 36)

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NOTE:
•
The fiber-optic and electrical connections that a 10/100/1000 Mbps Ethernet interface provides cannot
be used at the same time. If both connections are present, you can configure which connection takes
effect through commands. By default, the electrical connection works.
• 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.
MDI/MDIX autosensing is supported by the fixed 1000 Mbps electrical interface on the MSR 50 main
control board.
Ethernet cable
1. Electrical Ethernet interface cable
Ethernet interfaces usually use category 5 twisted pair cables, as shown in the following figure:
Figure 23 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.
2. Optical Ethernet interface cable.
For the 10/100/1000 Mbps optical Ethernet interfaces, select single-mode or multi-mode optical fibers
depending on the type of the installed 1000Base-X SFPs. As the interfaces that these SFP modules
provide use LC-type fiber-optic connectors, you must use fibers with LC-type connectors for them. All these
SFPs are hot swappable.
NOTE:
SFPs are optional. They are provided only when ordered.
Connecting the Ethernet cable
NOTE:
The fiber-optic and electrical connections that a 10/100/1000 Mbps Ethernet interface provides cannot
operate at the same time. If both connections are present, the system considers the optical interface as the
operating interface by default.