Specifications

Preparing to Install the Router 2-7
Preparing to Connect to a Network
Warning The ports labeled “Ethernet,” “10BaseT,” “Token Ring,” “Console,” and “AUX”
are safety extra-low voltage (SELV) circuits. SELV circuits should only be connected to
other SELV circuits. Because the BRI circuits are treated like telephone-network voltage,
avoid connecting the SELV circuit to the telephone network voltage (TNV) circuits. (To see
translated versions of this warning, refer to the Regulatory Compliance and Safety
Information document that accompanied the router.)
For additional information on connecting your ports, cables and network connections, refer
to the section “Troubleshooting the Ports, Cables, and Connections” in the appendix
“Troubleshooting the Router.”
Synchronous Serial Connections
Before you connect a device to the synchronous serial port (labeled “SERIAL”), you will
need to know the following:
• The type of device, DTE or DCE, you are connecting to the synchronous serial
interface.
• The type of connector, male or female, required to connect to the device.
• The signaling standard required by the device.
DTE or DCE
A device that communicates over a synchronous serial interface is either a DTE or DCE
device. A DCE device provides a clock signal that paces the communications between the
device and the router. A DTE device does not provide a clock signal. DTE devices usually
connect to DCE devices. The documentation that came with the communications device
should indicate whether it is a DTE or DCE device. (Some devices have a jumper to select
either mode.) If you cannot find the information in the documentation, refer to to help you
select the proper device type.