Connecting Aux To A Modem - 3Com MSR 50-40 ROUTER. Installation Manual

For a 10/100/1000 Mbps port, connect it to a PC or another router using a crossover cable or to a
Hub or LAN switch using a straight-through cable.
Step 2: View the LINK LED of the Ethernet interface: ON means a link is present. OFF means no link is
present; check the line for the cause
2) Connecting optical Ethernet interface cable.
When connecting optical fibers, observe the following:
Do not over-bend the fiber. Its curvature radius must be greater than 10 cm (3.9 in.).
Ensure that the Tx and Rx ends are correctly connected.
Ensure that the fiber ends are clean.
Laser danger! Invisible laser radiation may be emitted from the fiber-optic ports which are connected
with lasers. To protect your eyes against radiation harm, never stare into an open fiber-optic port.
Follow these steps to connect a 10/100/1000 Mbps optical interface:
Step 1: Use two fibers to connect the Rx and Tx ends of the interface to another device: Rx to Tx, and Tx
to Rx.
Step 2: Power on the router and view the LINK LED of the Ethernet interface. ON means the Rx link is
present. OFF means no Rx link is present; check the line for the cause.

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.
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