3Com Router 6000 Family
Installation Manual
Chapter 4
Starting and Configuring the Route
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3Com Corporation
3-10
I. 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.
For the AUX interface attributes, refer to the section “RPU”.
II. 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. The following figure illustrates the AUX cable.
Figure 3-9 AUX cable
III. Connecting the AUX cable
Follow these steps to connect the AUX cable.
Step 1: Plug the RJ-45 connector of the cable into the AUX port on the RPU.
Step 2: Plug the DB-25 or DB-9 connector into the serial port 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 through PSTN and then to the remote device.
3.10 Verifying Installation
During router installation, you must verify installation each time you power on the router,
making sure that:
z Adequate clearance is available around the router sides for dissipation.
z The rack or table is sturdy.
z The power source is correct.
z The PGND on the chassis is securely connected to the earth ground.