Netopia R2020 User Reference Manual page 27

The following table describes all the Netopia R2020 Dual Analog Router back panel ports.
Port
Power port
Line 1 port
Console port
Auxiliary port
Line 2 port
Crossover switch
8-port Ethernet hub
a mini-DIN8 power adapter cable connection.
a red RJ-11 telephone jack labelled "Line 1".
a DE-9 Console port for a direct serial connection to the console screens. You
may use this if you are an experienced user and choose not to use SmartStart.
See "Connecting a local terminal console cable to your router" on page
an HD-15 Auxiliary port for attaching an external modem or the optional
AppleTalk kit.
a red RJ-11 telephone jack labelled "Line 2".
If you have only one telephone wall jack, supporting either one or two telephone
numbers, use the "Line 1" port. "Line 1" supports two phone connections on a
single line; "Line 2" supports a single phone connection.
a crossover switch with Normal and Uplink positions. If Ethernet Port #1 is used
for a direct Ethernet connection between a computer and the router, set the
switch to the Normal position. If you are connecting the router to an Ethernet
hub, use Ethernet port #1 on the router and set the switch to the Uplink
position.
Eight Ethernet jacks. You will use one of these to configure the Netopia R2020.
For a new installation, you use the Ethernet connection. SmartStart only works
over Ethernet. Later, if you want to do some advanced configuration, you can
Telnet to the Console-based management screens via the Ethernet connection.
You may also use the Console connection to run the Console-based
management using a direct serial connection. You may either connect your
computer directly to any of the Ethernet ports on the router, or connect both
your computer and the router to an existing Ethernet hub on your LAN.
Making the Physical Connections 2-5
Description
5-3.