Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?


Replacing the Console or Auxiliary Cable on an MX960 Router

To use a system console to configure and manage the Routing Engine, connect it to the CONSOLE port on the Routing Engine. To use a laptop, modem, or other auxiliary device, connect it to the AUX port on the Routing Engine. Both ports accept a cable with an RJ-45 connector. If you want to connect a device to both ports, you must supply two cables.


We no longer include the RJ-45 console cable with the DB-9 adapter as part of the device package. If the console cable and adapter are not included in your device package, or if you need a different type of adapter, you can order the following separately:

  • RJ-45 to DB-9 adapter (JNP-CBL-RJ45-DB9)

  • RJ-45 to USB-A adapter (JNP-CBL-RJ45-USBA)

  • RJ-45 to USB-C adapter (JNP-CBL-RJ45-USBC)

If you want to use RJ-45 to USB-A or RJ-45 to USB-C adapter you must have X64 (64-Bit) Virtual COM port (VCP) driver installed on your PC. See, to download the driver.

To replace a cable connected to a management console or auxiliary device:

  1. Attach an ESD grounding strap to your bare wrist, and connect the other end of the strap to an ESD grounding point.
  2. Press the tab on the connector, and pull the connector straight out of the port.
  3. Disconnect the cable from the console or auxiliary device.
  4. Plug the RJ-45 end of the replacement serial cable into the CONSOLE or AUX port. Figure 1 shows the external device ports on the Routing Engine.
  5. Plug the female DB-9 end into the console or auxiliary device's serial port.
Figure 1: Auxiliary and Console PortsAuxiliary and Console Ports