You can use the console port on the chassis front panel to connect to the Routing Engine through an RJ-45 serial cable. From the chassis console port, you can use the CLI to configure the router. The console port is configured as data terminal equipment (DTE) and supports the RS-232 (EIA-232) standard.
For information about securing the chassis console port, see the J-series Services Router Administration Guide.
For pinout information, see Chassis Console Port Pinouts.