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Connect the QFX5120 to External Devices

Connect a Device to a Network for Out-of-Band Management

Ensure that you have an Ethernet cable that has an RJ-45 connector at either end.

Figure 1: RJ-45 Connector on an Ethernet CableRJ-45 Connector on an Ethernet Cable

You can monitor and manage a network device, such as a router or a switch, by using a dedicated management channel. Each device has a management port to which you can connect an Ethernet cable with an RJ-45 connector. Use the management port to connect the device to the management device.

To connect a device to a network for out-of-band management:

  1. Connect one end of the Ethernet cable to the management port on the device.
  2. Connect the other end of the Ethernet cable to the management device.

Connect a Device to a Management Console Using an RJ‑45 Connector

Ensure that you have an Ethernet cable that has an RJ-45 connector at either end and an RJ-45-to-DB-9 serial port adapter.

Figure 2: RJ-45 Connector on an Ethernet Cable RJ-45 Connector on an Ethernet Cable
Note:
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 https://ftdichip.com/drivers/vcp-drivers/ to download the driver.
Note:

If your laptop or desktop PC does not have a DB-9 plug connector pin and you want to connect your laptop or desktop PC directly to the device, use a combination of the RJ-45-to-DB-9 socket adapter and a USB-to-DB-9 plug adapter. You must provide the USB-to-DB-9 plug adapter.

You can configure and manage your network devices using a dedicated management channel. Each device has a console port that you can connect to using an Ethernet cable with an RJ-45 connector. Use the console port to connect the device to the console server or management console. The console port accepts a cable that has an RJ-45 connector.

To connect the device to a management console:

  1. Connect one end of the Ethernet cable to the console port (labeled CON, CONSOLE, or CON1) on the device.
  2. Connect the other end of the Ethernet cable to the console server (see Figure 3) or management console (see Figure 4).
Figure 3: Connect a Device to a Management Console Through a Console ServerConnect a Device to a Management Console Through a Console Server
Figure 4: Connect a Device Directly to a Management ConsoleConnect a Device Directly to a Management Console

Connecting 1-PPS and 10-MHz Measurement Devices to the QFX5120 Switch

Before you connect a QFX5120-48T or QFX5120-48YM switch to measurement devices:

  • Ensure that the measurement equipment is compatible with transistor-transistor logic (TTL) (5.0 V).

  • Ensure that you have a cable with length up to 3 m.

QFX5120-48T and QFX5120-48YM switches have one 2x1 DIN 1.0/2.3 connector that supports 1-PPS-OUT and 10-MHz-OUT measurement ports, labeled PPS OUT and 10M OUT, on the rear panel of the switch.

To connect the DIN cable to the external measurement device:

  1. Connect one end of the DIN cable connectors to the 1-PPS-OUT and the 10-MHz-OUT ports, labeled PPS OUT and 10M OUT, on the rear panel of the switch.
  2. Connect the other end of the DIN cable connectors to the measurement equipment.