H3C Technologies H3C MSR 20-1X - Manual (Page 33)

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Step2 View the LINK LED of the Ethernet interface. If the LINK LED is ON, a link is present. If the LINK LED is OFF,
no link is present. In the latter case, check the line.
Connecting the AUX Interface to a Modem
AUX interface
The AUX interface is an RS232 asynchronous serial interface, which can serve as a backup interface of
a WAN interface and provide dial connection. In case of console failure, the AUX interface can function
as the console interface.
AUX cable
The AUX cable is an 8-core shielded cable. An RJ45 connector is equipped at one end and is connected
to the AUX interface. A DB25 male connector and a DB9 male connector are equipped at the other end
and one of them is connected to the serial interface of the Modem.
Figure 22 AUX cable
Connecting the AUX cable
Follow these steps to connect the AUX cable.
Step1 Plug the RJ-45 connector of the cable into the AUX interface on the main control board.
Step2 Plug the DB-25 or DB-9 connector into the serial interface on the analog Modem.
When using the AUX interface for remote configuration or dial backup, you need to connect the local
Modem to the remote Modem over PSTN and then to the remote device. For the configuration procedure,
refer to MSR Series Routers Configuration Guide.
MSR 20-1X routers provide various interface cards and interface modules. For detailed information, refer
to MSR Series Routers Interface Module Manual.