3Com MSR 50-40 ROUTER. Installation Manual page 40

Figure 3-8 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.
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.
SFPs are optional. They are provided only when ordered.
Connecting the Ethernet cable
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.
1) Connecting electrical Ethernet interface cable.
Follow the steps below to connect an Ethernet cable:
Step 1: Connect one end of the Ethernet cable to an Ethernet port on the router and the other end to
another device.
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