EX4200 Chassis
Front Panel of an EX4200 Switch
The front panel of an EX4200 switch consists of the following components:
Network ports—depending on the switch model, either:
10/100/1000Base-T Gigabit Ethernet ports, some or all of which are enabled for Power over Ethernet (PoE)
100Base-FX/1000Base-X SFP ports for use with fiber-optic connections
Uplink module ports—SFP, SFP+, or XFP ports (Installing the uplink module is an optional.)
LCD panel and the LCD navigation buttons
Chassis status LEDs
Network port LEDs
Figure 1 shows the front panel of an EX4200 switch with 48 Gigabit Ethernet ports. Figure 2 shows the front panel of an EX4200 switch with 24 Gigabit Ethernet ports. Figure 3 shows the front panel of an EX4200-24F switch with 24 SFP ports for use with fiber-optic connectors.



Rear Panel of an EX4200 Switch
The rear panel of the EX4200 switch accomdates the following components:
Fan tray
Virtual Chassis ports (VCPs)
USB port
Temperature shutdown LED
Management Ethernet port
Console port
ESD point
Power supply or power supplies
Figure 4 shows the rear panel of an EX4200 switch with power supplies and fan tray installed. The rear panel of all the EX4200 switches except EX4200-24F-S and EX4200-48T-S switches are similar. All EX4200 switches except the EX4200-24F-S and EX4200-48T-S switches are shipped with the power supplies and fan tray pre-installed in the rear panel of the switch. The power supplies and the fan tray for the EX4200-24F-S and EX4200-48T-S models are not shipped by default; you must order them separately and install them in the rear panel. The 320 W AC power supply and the 190 W DC are flush with the chassis. The 600 W AC power supply and 930 W AC power supply extend out of the chassis by 2.25 in. Power cord retainer clips extend out of the power supply by 3 in.

LCD Panel in EX4200 Switches
The LCD panel on the front panel of the switch shows two lines of text, each of which can contain a maximum of 16 characters. The LCD panel displays a variety of information about the switch and also provides a menu to perform basic operations such as initial setup and reboot.
There are two navigation buttons—Menu and Enter—to the right of the LCD panel.
See Figure 5.

You can configure the second line of the LCD panel to display a custom message. If the LCD panel is configured to display a custom message, the Menu button and the Enter button are disabled. See Configuring the LCD Panel on EX Series Switches (CLI Procedure).
The LCD panel has a backlight. If the LCD panel is idle for 60 seconds, the backlight turns off. You can turn on the backlight by pressing the Menu or Enter button once. After turning on the backlight, you can toggle between the LCD panel menus by pressing the Menu button and navigate through the menu options by pressing the Enter button.
The chassis viewer in the J-Web interface also displays the LCD panel. From the J-Web interface, you can view real-time status information in the LCD panel. See Dashboard for EX Series Switches.
LCD Panel Modes
The LCD panel operates in four modes: boot, idle, status, and maintenance.
The LCD panel operates in boot mode during switch reboot. The boot mode displays the key milestones in the switch boot process. The boot mode does not have any menu options. After the boot process is complete, the LCD panel automatically reverts to the Idle menu.
In an EX4200 switch that is not a member of a Virtual Chassis, the first line of the LCD panel displays the slot number, the role of the switch, and hostname. For a standalone EX4200 switch, the slot number is always 00 and the role is always RE (for primary).
In an EX4200 switch that is a member of a Virtual Chassis, the first line of the LCD panel displays:
The slot number (the member ID for the Virtual Chassis member)
Role of the switch in a Virtual Chassis (RE for primary, BK for backup, and LC for linecard member)
Hostname
In the idle mode, the second line displays the mode of the network ports’ Status LED and the number of chassis alarms. The number of alarms is updated every second.
In the status mode, the second line displays:
Virtual Chassis port (VCP) status (for an EX4200 switch that is a member of a Virtual Chassis)
Status of the power supply
Status of the fan and temperature
Version of Junos OS for EX Series switches loaded on the switch
In the maintenance mode, the second line displays one of the following options that you can use to configure and troubleshoot the switch:
System halt
System reboot
Load rescue
Request VC port (for an EX4200 switch that is a member of a Virtual Chassis)
Factory default
System EZSetup
Uplink Modules in EX4200 Switches
EX4200 switches support four types of uplink modules:
SFP uplink module—Provides four ports for 1-gigabit small form-factor pluggable (SFP) transceivers. The model number of the uplink module is EX-UM-4SFP.
SFP+ uplink module—Provides two ports for 10-gigabit small form-factor pluggable (SFP+) transceivers when configured to operate in 10-gigabit mode or four ports for 1-gigabit small form-factor pluggable (SFP) transceivers when configured to operate in 1-gigabit mode. The model number of the uplink module is EX-UM-2X4SFP.
SFP+ Media Access Control Security (MACsec) uplink module—Provides two ports for 10-gigabit small form-factor pluggable (SFP+) transceivers when configured to operate in 10-gigabit mode or four ports for 1-gigabit small form-factor pluggable (SFP) transceivers when configured to operate in 1-gigabit mode. All four ports on the uplink module are MACsec-capable. The model number of the uplink module is EX-UM-2X4SFP-M.
XFP uplink module—Provides two ports for 10-gigabit small form-factor pluggable (XFP) transceivers. The model number of the uplink module is EX-UM-2XFP.
When a new uplink module is installed in the switch or an existing uplink module is replaced with another uplink module, the switch detects the newly installed uplink module. The switch creates the required interfaces if the uplink module has transceivers in its ports and when new transceivers are installed in uplink module ports.
The packet forwarding process (pfem) restarts and causes traffic loss, if you:
Install an uplink module (SFP, SFP+, SFP+ MACsec, or XFP)
Replace an existing uplink module with another uplink module
Change the operating mode of an SFP+ or an SFP+ MACsec uplink module (10-gigabit to 1-gigabit or 1-gigabit to 10-gigabit) installed in the switch
When connecting uplink module ports, you can install an SFP uplink module at one end of the connection and install an SFP+ uplink module configured to operate in the 1-gigabit mode at the other end. Likewise, you can install an XFP uplink module at one end of the connection and install an SFP+ uplink module configured to operate in the 10-gigabit mode at the other end.
SFP Uplink Module
Figure 6 shows the SFP uplink module, which provides four ports for 1-gigabit SFP transceivers.

SFP uplink modules are shipped with dust covers preinstalled in the ports.
The SFP uplink module requires Junos OS for EX Series switches, Release 9.0 or later.
SFP+ Uplink Module and SFP+ MACsec Uplink Module
The SFP+ uplink module and the SFP+ MACsec uplink module can be used for either SFP+ or SFP transceivers. You configure the operating mode on the module to match the type of transceiver you want to use—for SFP+ transceivers, you configure the 10-gigabit operating mode, and for SFP transceivers, you configure the 1-gigabit operating mode. See Setting the Mode on an SFP+ or SFP+ MACSec Uplink Module .
By default, the SFP+ uplink module and the SFP+ MACsec uplink module operate in the 10-gigabit mode and support only SFP+ transceivers. If you have not changed the module from the default setting and you want to use SFP+ transceivers, you do not need to configure the operating mode.
If the operating mode and the configured mode for the uplink module are different, it is shown in the output of show chassis pic fpc-slot slot number pic-slot 1.
Figure 7 shows the SFP+ uplink module and the SFP+ MACsec uplink module.

The following transceivers can be installed in the uplink module ports:
SFP+ transceivers are supported in ports 0 and 2.
SFP transceivers are supported in all four ports.
The ports that support SFP+ transceivers are labeled 10 G on the uplink module’s faceplate (see Figure 7).
When an SFP+ uplink module or an SFP+ MACsec uplink module is operating in 10-gigabit mode:
Only the 10-gigabit ports (ports 0 and 2) are enabled.
You can use only SFP+ transceivers in those ports.
When an SFP+ uplink module or an SFP+ MACsec uplink module is operating in 1-gigabit mode:
All four ports are enabled.
You can use only SFP transceivers in all four ports.
The SFP+ uplink module and the SFP+ MACsec uplink module have an LED on the faceplate (labeled Operating mode LED in Figure 7) that indicates the operating mode. If the uplink module is operating in the 10-gigabit mode, the LED is lit. If the uplink module is operating in the 1-gigabit mode, the LED is unlit.
SFP+ uplink modules and the SFP+ MACsec uplink modules are shipped with dust covers preinstalled in the ports.
The SFP+ uplink module requires Junos OS for EX Series switches, Release 9.4 or later. The SFP+ MACsec uplink module requires Junos OS for EX Series switches, Release 13.2X50-D10 or later.
XFP Uplink Module
Figure 8 shows the XFP uplink module, which provides two ports for 10-gigabit XFP transceivers.

XFP uplink modules are shipped with a dust cover preinstalled in one port.
The XFP uplink module requires Junos OS for EX Series switches, Release 9.0 or later.
Chassis Status LEDs in EX4200 Switches
The front panel of an EX4200 switch has three LEDs on the far right side of the panel, next to the LCD panel (see Figure 9).

Table 1 describes the chassis status LEDs in an EX4200 switch, their colors and states, and the status they indicate. You can view the colors of the three LEDs remotely through the CLI by issuing the operational mode command show chassis lcd.
Table 1: Chassis Status LEDs in an EX4200 Switch
LED Label | Color | State and Description |
---|---|---|
ALM (Alarm) | Unlit | There is no alarm or the switch is halted. |
Red | There is a major alarm. Note: When you connect power to the switch, the Alarm (ALM) LED lights red. This behavior is normal. Plugging an active Ethernet cable into the management (MGMT) port on the switch completes the network link and turns off the ALM LED. (See Connect a Device to a Network for Out-of-Band Management.) Connecting the switch to a dedicated management console instead of a network does not affect the ALM LED. The LED remains red until the switch is connected to a network. | |
Amber | There is a minor alarm. Note: The Alarm (ALM) LED lights amber if you commit a configuration to make it active on the switch and do not also create a rescue configuration to back it up. To save the most recently committed configuration as the rescue configuration, enter the operational mode command request system configuration rescue save. | |
SYS (System) | Green |
|
MST (Primary) | Green | In a standalone EX4200 switch:
In a Virtual chassis configuration:
|
A major alarm (red) indicates a critical error condition that requires immediate action.
A minor alarm (amber) indicates a noncritical condition that requires monitoring or maintenance. A minor alarm that is left unchecked might cause interruption in service or performance degradation.
The amber glow of the Alarm LED that indicates a minor alarm closely resembles the red glow that indicates a major alarm.
All three LEDs can be lit simultaneously.
Management Port LEDs in EX4200 Switches
The management port on EX4200 switches has two LEDs that indicate link/activity and port status (see Figure 10). The management port is set to full-duplex and the speed is set to 100 Mbps.

Table 2 describes the Link/Activity LED.
Table 2: Link/Activity LED on the Management Port on EX4200 Switches
LED | Color | State and Description |
---|---|---|
Link/Activity | Green |
|
Table 3 describes the Status LED (administrative status).
Table 3: Status LED on the Management Port on EX4200 Switches
LED | Color | State and Description |
---|---|---|
Status | Green |
|
Network Port LEDs in EX4200 Switches
Each network port on the switch has two LEDs. The four figures in this topic show the location of those LEDs:
Figure 11 shows the location of the LEDs on the network ports on the front panel.
Figure 12 shows the location of the LEDs on the uplink module ports on the SFP uplink module.
Figure 13 shows the location of the LEDs on the uplink module ports on the SFP+ and SFP+ MACsec uplink modules.
Figure 14 shows the location of the LEDs on the uplink module ports on the XFP uplink module.




The LEDs labeled Link/Activity LED in Figure 11, Figure 12, Figure 13, and Figure 14 indicate link activity. The LEDs labeled Status LED in Figure 11, Figure 12, Figure 13, and Figure 14 indicate the status of one of the four port parameters. The port parameters are administrative status, duplex mode, Power over Ethernet (PoE) status, and speed.
Table 4 describes the Link/Activity LED.
Table 4: Link/Activity LED on Network Ports
LED | Color | State and Description |
---|---|---|
Link/Activity | Green |
|
Table 5 describes the Status LED. From the Idle menu of the LCD, use the Enter button on the LCD panel to toggle between the ADM, DPX, POE, and SPD indicators.
Table 5: Status LED on Network Ports
LED | LCD Indicator | State and Description |
---|---|---|
Status | LED: ADM | Indicates the administrative status (enabled or disabled). The status indicators are:
|
LED: DPX | Indicates the duplex mode. The uplink module ports are always set to full-duplex; therefore, the LED is always green. The status indicators for network ports on the front panel are:
| |
LED: MACsec | Indicates the MACsec status (enabled or disabled). MACsec can be enabled only if you have installed the SFP+ MACsec uplink module. The status indicators are:
| |
LED: POE | Indicates the PoE status on switches with PoE-enabled ports. Here the term POE refers to both PoE and PoE+ as applicable. PoE is not enabled on uplink module ports; therefore, the LED for those ports is always unlit. The status indicators for network ports on the front panel are:
| |
LED: SPD | Indicates the speed. The speed indicators for network ports on the front panel are:
The speed indicators for network ports on the SFP uplink module are:
The speed indicators for network ports on the SFP+ and SFP+ MACsec uplink module are:
The speed of the XFP uplink module ports is always 10 Gbps, which is also the speed of XFP transceivers, therefore, this LED is always green on an XFP uplink module. |