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QFX5120 System Overview

 

QFX5120 Switches Hardware Overview

The QFX5120 line of switches delivers low latency, flexible deployment options, and rich automation features. QFX5120 Switches build a strong underlay foundation for flexible, high-performance, standards-based fabrics and routing that improve network reliability and agility.

The QFX5120 switch is available in four models—QFX5120-32C, QFX5120-48T, QFX5120-48Y, and QFX5120-48YM. Each model is available in two variants featuring AC power supplies with front-to-back or back-to-front airflow and two models featuring DC power supplies with front-to-back or back-to-front airflow.

For a brief overview of the QFX5120-48T switch, see:

 

For a brief overview of the QFX5120-48Y switch, see:

 

For a brief overview of the QFX5120-48YM switch, see:

 

Benefits of the QFX5120 Switch

EVPN-VXLAN architecture - QFX5120 Switches support IP fabrics with EVPN-VXLAN overlays, enabling Layer 2/3 network virtualization.

Hop-by-hop encryption - QFX5120-48YM supports IEEE 802.1AE MACsec AES-256 on all ports to help secure data center and Ethernet-based DCI/WAN deployments.

Synchronization services – Support for PTP enables QFX5120 to meet the requirements of the financial services industry (FSI) and the broadcasting media industry.

Industry-leading wire speeds—QFX5120 switches offer 25-Gbps and 100-Gbps wire speeds.

Support for channelization—You can channelize the QSFP28 ports and increase the number of interfaces.

Support for Virtual Chassis—QFX5120-32C, QFX5120-48T, and QFX5120-48Y switches support Virtual Chassis technology. You can interconnect up to two QFX5120-32C, QFX5120-48T, or QFX5120-48Y switches in a Virtual Chassis configuration.

System Software and Hardware and Software Features

Juniper Networks QFX Series Switches run Junos operating system (Junos OS), which provides Layer 2 and Layer 3 switching, routing, and security services. The first Junos OS release and hardware and software features supported on the models are listed in Table 1.

Table 1: First Junos OS Release and Hardware and Software Features Supported on QFX5120 Switch Models

Switch Model

First Junos OS Release Supported

Hardware Features

Aggregate Throughput (Bidirectional)

Software Features

QFX5120-

32C

Junos OS Release

19.1R1

  • 2.2-GHz quad-core Intel CPU

  • 16-GB memory

  • 64-GB SSD storage

6.4 Tbps

  • Feature-rich automation capabilities with support for Python, Ansible, YANG, Chef, and zero-touch provisioning (ZTP)

  • Support for VXLAN as a Layer 2 or Layer 3 gateway and Open vSwitch Database (OVSDB) protocol as a Layer 2 gateway

  • Advanced Junos OS features such as EVPN, BGP, MPLS, Layer 3 VPN, IPv6 Provider Edge (6PE), telemetry, segment routing, and MC-LAG

QFX5120-

48T

Junos OS Release

20.2R1

  • 2.2-GHz quad-core Intel CPU

  • 16-GB memory

  • 100-GB SSD storage

2.16 Tbps

QFX5120-

48Y

Junos OS Release

18.3R1

  • 2.2-GHz quad-core Intel CPU

  • 16-GB memory

  • 50-GB SSD storage

4 Tbps

QFX5120-

48YM

Junos OS Release

20.4R1

  • 2.9-GHz quad-core Intel CPU

  • 16-GB memory

  • 100-GB SSD storage

4 Tbps

Channelization in QFX5120 Switches

QFX5120 switches support channelization. You can channelize the 100GbE/40GbE quad small form-factor pluggable (QSFP28) ports into interfaces by connecting breakout cables and by using CLI configuration. Table 2 lists the channelization supported on the models.

Table 2: Channelization in QFX5120 Switches

Switch Model

Ports

Port Speed

Supported Channelization

For More Information

QFX5120-32C

0 through 30

40 Gbps

Four 10GbE interfaces

Channelizing Interfaces on QFX5120-32C Switches

0 through 30

100 Gbps

Four 25GbE interfaces

0 through 31

Note: On port 31, you cannot configure four 10GbE interfaces or four 25GbE interfaces.

100 Gbps

Two 50GbE interfaces

QFX5120-48T

50 and 51

40 Gbps

Four 10GbE interfaces

Channelizing Interfaces on QFX5120-48T Switches

50 and 51

100 Gbps

Four 25GbE interfaces

48 through 53

100 Gbps

Two 50GbE interfaces

QFX5120-48Y

48 through 55

40 Gbps

Four 10GbE interfaces

Channelizing Interfaces on QFX5120-48Y Switches

48 through 55

100 Gbps

Four 25GbE interfaces

QFX5120-48YM

50 and 52

40 Gbps

Four 10GbE interfaces

Channelizing Interfaces on QFX5120-48YM Switches

50 and 52

100 Gbps

Four 25GbE interfaces

50 and 52

100 Gbps

Two 50GbE interfaces

Components on the Front and Rear Panels

QFX5120-32C Switches

Figure 1 shows the front view of the QFX5120-32C switch.

Figure 1: QFX5120-32C—Front View
QFX5120-32C—Front
View

Figure 2 shows the rear view of the QFX5120-32C switch.

Figure 2: QFX5120-32C—Rear View
QFX5120-32C—Rear View

Figure 3 shows the components on the front panel of a QFX5120-32C switch.

Figure 3: Components on the Front Panel of a QFX5120-32C Switch
Components on the Front
Panel of a QFX5120-32C Switch
  1
QSFP28 ports
  5
RJ-45 console port (labeled CON)
  2
RJ-45 management port (labeled MGMT)
  6
Chassis ID LED (labeled ID)
  3
SFP+ ports
  7
Reset button
  4
USB port
 

Figure 4 shows the components on the rear panel of a QFX5120-32C switch with AC power supplies.

Figure 4: Components on the Rear Panel of a QFX5120-32C Switch with AC Power Supplies
Components on the Rear
Panel of a QFX5120-32C Switch with AC Power Supplies
  1
AC power supply
  3
Fan module LEDs
  2
Fan modules
 

Figure 5 shows the components on the rear panel of a QFX5120-32C switch with DC power supplies.

Figure 5: Components on the Rear Panel of a QFX5120-32C Switch with DC Power Supplies
Components
on the Rear Panel of a QFX5120-32C Switch with DC Power Supplies
  1
DC power supply
  3
Fan module LEDs
  2
Fan modules
 

QFX5120-48T Switches

Figure 6 shows the front view of the QFX5120-48T switch.

Figure 6: QFX5120-48T—Front View
QFX5120-48T—Front
View

Figure 7 shows the rear view of the QFX5120-48T switch.

Figure 7: QFX5120-48T—Rear View
QFX5120-48T—Rear View

Figure 8 shows the components on the front panel of a QFX5120-48T switch.

Figure 8: Components on the Front Panel of a QFX5120-48T Switch
Components
on the Front Panel of a QFX5120-48T Switch
  1
10-Gbps BASE-T ports
  2
100GbE/40GbE QSFP28 ports

Figure 9 shows the components on the rear panel of a QFX5120-48T switch with AC power supplies.

Figure 9: Components on the Rear Panel of a QFX5120-48T Switch with AC Power Supplies
Components
on the Rear Panel of a QFX5120-48T Switch with AC Power Supplies
  1
Chassis status LEDs (labeled ALM, SYS, MST, and ID)
  8
Fan module LEDs
  2
RJ-45 management port (labeled MGMT)
  9
10M OUT port
  3
PPS OUT port
10
USB port
  4
ESD point
11
RJ-45 console port (labeled CON)
  5
Fan modules
12
Reset button
  6
AC power supplies
13
CLEI code label
  7
AC power supply LEDs
 

Figure 10 shows the components on the rear panel of a QFX5120-48T switch with DC power supplies.

Figure 10: Components on the Rear Panel of a QFX5120-48T Switch with DC Power Supplies
Components
on the Rear Panel of a QFX5120-48T Switch with DC Power Supplies
  1
Chassis status LEDs (labeled ALM, SYS, MST, and ID)
  8
Fan module LEDs
  2
RJ-45 management port
  9
10M OUT port
  3
PPS OUT port
10
USB port
  4
ESD point
11
RJ-45 console port
  5
Fan modules
12
Reset button
  6
DC power supplies
13
CLEI code label
  7
DC power supply LEDs
 

Figure 11 shows the components on the rear panel of a QFX5120-48T switch with high-voltage power supplies.

Figure 11: Components on the Rear Panel of a QFX5120-48T Switch with High-Voltage Power Supplies
Components
on the Rear Panel of a QFX5120-48T Switch with High-Voltage Power
Supplies
  1
Chassis status LEDs (labeled ALM, SYS, MST, and ID)
  8
Fan module LEDs
  2
RJ-45 management port
  9
10M OUT port
  3
PPS OUT port
10
USB port
  4
ESD point
11
RJ-45 console port
  5
Fan modules
12
Reset button
  6
High-voltage power supplies
13
CLEI code label
  7
High-voltage power supply LEDs
 

QFX5120-48Y Switches

Figure 12 shows the front view of the QFX5120-48Y switch.

Figure 12: QFX5120-48Y—Front View
QFX5120-48Y—Front
View

Figure 13 shows the rear view of the QFX5120-48Y switch.

Figure 13: QFX5120-48Y—Rear View
QFX5120-48Y—Rear View

Figure 14 shows the components on the front panel of a QFX5120-48Y switch.

Figure 14: Components on the Front Panel of a QFX5120-48Y Switch
Components on the Front
Panel of a QFX5120-48Y Switch
  1
SFP28 ports
  2
QSFP28 ports
Note
  • The SFP28 ports are grouped in quads (groups of four) and you can configure the speed of the ports only in quads; you cannot configure the speed for a single SFP28 port.

  • The SFP28 ports can operate at 25-Gbps, 10-Gbps, or 1-Gbps speed, based on the configuration set at the quad level. The ports are configured to operate at 10-Gbps speed by default. If you need the ports to support the other speeds, you must configure those speeds.

Caution

Do not install 1GbE copper transceivers (such as QFX-SFP-1GE-T) directly above or below another 1GbE copper transceiver. Use only the top row or bottom row to avoid damage to the device caused by some types of copper transceivers when the transceivers are installed above or below each other. However, if you are using copper transceivers with the OEM part number FCLF8521P2BTL-J1 printed on the transceiver label, you can install the transceivers in any port with no restrictions. For devices that support 10GbE copper transceivers, there is no similar restriction.

Figure 15 shows the components on the rear panel of a QFX5120-48Y switch with AC power supplies.

Figure 15: Components on the Rear Panel of a QFX5120-48Y Switch with AC Power Supplies
Components on the
Rear Panel of a QFX5120-48Y Switch with AC Power Supplies
  1
Chassis status LEDs
  7
Power supply LEDs
  2
RJ-45 console port
  8
Fan module LEDs
  3
RJ-45 management port (labeled C1)
  9
RJ-45 management port (labeled C0)
  4
ESD point
10
Reset button
  5
Fan modules
11
USB port
  6
Power supplies
12
CLEI code label

Figure 16 shows the components on the rear panel of a QFX5120-48Y switch with DC power supplies.

Figure 16: Components on the Rear Panel of a QFX5120-48Y Switch with DC Power Supplies
Components on the
Rear Panel of a QFX5120-48Y Switch with DC Power Supplies
  1
Chassis status LEDs
  7
Power supply LEDs
  2
RJ-45 console port
  8
Fan module LEDs
  3
RJ-45 management port (labeled C1)
  9
RJ-45 management port (labeled C0)
  4
ESD point
10
Reset button
  5
Fan modules
11
USB port
  6
Power supplies
12
CLEI code label

QFX5120-48YM Switches

Figure 17 shows the front view of the QFX5120-48YM switch.

Figure 17: QFX5120-48YM—Front View
QFX5120-48YM—Front
View

Figure 18 shows the rear view of the QFX5120-48YM switch.

Figure 18: QFX5120-48YM—Rear View
QFX5120-48YM—Rear
View

Figure 19 shows the components on the front panel of a QFX5120-48YM switch.

Figure 19: Components on the Front Panel of a QFX5120-48YM Switch
Components on the Front
Panel of a QFX5120-48YM Switch
  1
SFP28 ports
  2
QSFP28 ports
Note
  • The SFP28 ports are grouped in quads (groups of four) and you can configure the speed of the ports only in quads; you cannot configure the speed for a single SFP28 port.

  • The SFP28 ports can operate at 25-Gbps, 10-Gbps, or 1-Gbps speed, based on the configuration set at the quad level. The ports are configured to operate at 10-Gbps speed by default. If you need the ports to support the other speeds, you must configure those speeds.

Figure 20 shows the components on the rear panel of a QFX5120-48YM switch with AC power supplies.

Figure 20: Components on the Rear Panel of a QFX5120-48YM Switch with AC Power Supplies
Components on
the Rear Panel of a QFX5120-48YM Switch with AC Power Supplies
  1
Chassis status LEDs (labeled ALM, SYS, MST, and ID)
  7
Power supply LEDs
  2
RJ-45 console port
  8
Fan module LEDs
  3
RJ-45 management port (labeled C1)
  9
10M OUT and PPS OUT ports
  4
ESD point
10
RJ-45 management port (labeled C0)
  5
Fan modules
11
Reset button
  6
Power supplies
12
USB port

Figure 21 shows the components on the rear panel of a QFX5120-48YM switch with DC power supplies.

Figure 21: Components on the Rear Panel of a QFX5120-48YM Switch with DC Power Supplies
Components on
the Rear Panel of a QFX5120-48YM Switch with DC Power Supplies
  1
Chassis status LEDs (labeled ALM, SYS, MST, and ID)
  7
Power supply LEDs
  2
RJ-45 console port
  8
Fan module LEDs
  3
RJ-45 management port (labeled C1)
  9
10M OUT and PPS OUT ports
  4
ESD point
10
RJ-45 management port (labeled C0)
  5
Fan modules
11
Reset button
  6
Power supplies
12
USB port

The CLEI code label is on the top panel of QFX5120-48YM switches, above the management ports. Figure 22 shows the location of the CLEI code label.

Figure 22: Location of the CLEI Code Label on QFX5120-48YM Switches
Location of the CLEI Code Label
on QFX5120-48YM Switches
  1
CLEI code label
 

Virtual Chassis

QFX5120-32C, QFX5120-48T, and QFX5120-48Y switches support Virtual Chassis technology. You can connect a QX5120 switch only with another QFX5120 switch of the same model in a Virtual Chassis configuration. QFX5120 switches do not have dedicated or default Virtual Chassis ports (VCPs). However, you can configure any of the QSFP28 ports as VCPs when those ports are not channelized. Table 3 lists the Junos OS release in which Virtual Chassis support is introduced and the QSFP28 ports that you can configure as VCPs.

Table 3: Virtual Chassis Support in QFX5120 Switches

Model

Support Introduced in Release

Maximum Number of Switches in the Virtual Chassis

Virtual Chassis Ports

QFX5120-32C

Junos OS Release 20.3R1

2

32 QSFP28 ports (0 through 31)

QFX5120-48T

Junos OS Release 20.2R1

2

6 QSFP28 ports (48 through 53)

QFX5120-48Y

Junos OS Release 19.3R1

2

8 QSFP28 ports (48 through 55)

You configure, monitor, and maintain the QFX5120 Virtual Chassis the same way as you configure, monitor, and maintain a Virtual Chassis involving other QFX Series switches. See the following topics for more details on how to configure and change the members in a QFX5120 Virtual Chassis:

QFX5120 Cooling System

The cooling system in QFX5120 switches consists of fan modules and built-in fans in the power supplies. The airflow direction depends on the fan modules and power supplies installed in the switch. You can order a QFX5120 switch that supports front-to-back airflow (air enters through the front of the switch) or back-to-front airflow (air enters through the back of the switch).

The fan modules are hot-removable and hot-insertable field-replaceable units (FRUs) installed in the rear panel of the switch: You can remove and replace them without powering off the switch or disrupting switch functions.

QFX5120 Power System

QFX5120-32C, QFX5120-48T, and QFX5120-48Y switches support two 650-W AC or DC power supplies with front-to-back or back-to-front airflow. Additionally, QFX5120-48T switches support two 850-W high-voltage power supplies with AC or DC input and front-to-back or back-to-front airflow. QFX5120-48YM switches support two 850-W AC or DC power supplies with front-to-back or back-to-front airflow. Power supplies for the QFX5120 switch are fully redundant, load-sharing, and hot-removable and hot-insertable FRUs when the second power supply is installed and running. You can remove and replace them without powering off the switch or disrupting switch functions. Each power supply is cooled by its own internal cooling system. We ship QFX5120 switches with two AC or DC power supplies preinstalled in the rear panel of the chassis.

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

  • 650-W and 850-W power supplies in the same QFX5120-48T chassis.

  • Power supplies with different airflow directions in the same chassis.

  • Fan modules with different airflow directions in the same chassis.

  • Power supplies and fan modules with different airflow directions in the same chassis.

If you install power supplies or fan modules with different airflow directions, Junos OS raises an alarm.

QFX5120 Switch Models and Variants

The QFX5120 has four models: QFX5120-32C, QFX5120-48T, QFX5120-48Y, and QFX5120-48YM. Each of these models has variants depending on power supply (AC or DC) and airflow (front-to-back or back-to-front). All variants of the QFX5120-32C switch ship with two power supplies and six fans installed by default. All variants of the QFX5120-48T, QFX5120-48Y, and QFX5120-48YM switches ship with two power supplies and five fans installed by default. Table 4 lists the components shipped with QFX5120 switch models and their variants.

Table 4: QFX5120 Switch Models and Their Configurations

Model Number

Number of Ports and Their Types

Power Supplies Shipped by Default

Fan Modules Shipped by Default

QFX5120-

32C-AFO

  • 2 10GbE SFP+

  • 32 100GbE/40GbE QSFP28

Two 650-W AC power supplies with front-to-back airflow, indicated by a red ejector lever.

Six fan modules with front-to-back airflow, indicated by the label F2B and a red handle.

QFX5120-

32C-AFI

  • 2 10GbE SFP+

  • 32 100GbE/40GbE QSFP28

Two 650-W AC power supplies with back-to-front airflow, indicated by a blue ejector lever.

Six fan modules with back-to-front airflow, indicated by the label B2F and a blue handle.

QFX5120-

32C-DC-AFO

  • 2 10GbE SFP+

  • 32 100GbE/40GbE QSFP28

Two 650-W DC power supplies with front-to-back airflow, indicated by a red ejector lever.

Six fan modules with front-to-back airflow, indicated by the label F2B and a red handle.

QFX5120-

32C-DC-AFI

  • 2 10GbE SFP+

  • 32 100GbE/40GbE QSFP28

Two 650-W DC power supplies with back-to-front airflow, indicated by a blue ejector lever.

Six fan modules with back-to-front airflow, indicated by the label B2F and a blue handle.

QFX5120-

48T-AFO

  • 6 100GbE/40GbE QSFP28

  • 48 10GbE BASE-T

Two 650-W AC power supplies with front-to-back airflow, indicated by a Juniper Gold ejector lever.

Five fan modules with front-to-back airflow, indicated by the label AIR OUT and a Juniper Gold handle.

QFX5120-

48T-AFI

  • 6 100GbE/40GbE QSFP28

  • 48 10GbE BASE-T

Two 650-W AC power supplies with back-to-front airflow, indicated by a Juniper Azure Blue ejector lever.

Five fan modules with back-to-front airflow, indicated by the label AIR IN and a Juniper Azure Blue handle.

QFX5120-

48T-DC-AFO

  • 6 100GbE/40GbE QSFP28

  • 48 10GbE BASE-T

Two 650-W DC power supplies with front-to-back airflow, indicated by a Juniper Gold ejector lever.

Five fan modules with front-to-back airflow, indicated by the label AIR OUT and a Juniper Gold handle.

QFX5120-

48T-DC-AFI

  • 6 100GbE/40GbE QSFP28

  • 48 10GbE BASE-T

Two 650-W DC power supplies with back-to-front airflow, indicated by a Juniper Azure Blue ejector lever.

Five fan modules with back-to-front airflow, indicated by the label AIR IN and a Juniper Azure Blue handle.

QFX5120-

48Y-AFO2

  • 8 100GbE/40GbE QSFP28

  • 48 25GbE/

    10GbE/1GbE SFP28

Two 650-W AC power supplies with front-to-back airflow, indicated by a Juniper Gold ejector lever.

Five fan modules with front-to-back airflow, indicated by the label AIR OUT and a Juniper Gold handle.

QFX5120-

48Y-AFI2

  • 8 100GbE/40GbE QSFP28

  • 48 25GbE/

    10GbE/1GbE SFP28

Two 650-W AC power supplies with back-to-front airflow, indicated by a Juniper Azure Blue ejector lever.

Five fan modules with back-to-front airflow, indicated by the label AIR IN and a Juniper Azure Blue handle.

QFX5120-

48Y-DC-AFO2

  • 8 100GbE/40GbE QSFP28

  • 48 25GbE/

    10GbE/1GbE SFP28

Two 650-W DC power supplies with front-to-back airflow, indicated by a Juniper Gold ejector lever.

Five fan modules with front-to-back airflow, indicated by the label AIR OUT and a Juniper Gold handle.

QFX5120-

48Y-DC-AFI2

  • 8 100GbE/40GbE QSFP28

  • 48 25GbE/

    10GbE/1GbE SFP28

Two 650-W DC power supplies with back-to-front airflow, indicated by a Juniper Azure Blue ejector lever.

Five fan modules with back-to-front airflow, indicated by the label AIR IN and a Juniper Azure Blue handle.

QFX5120-

48YM-AFO

  • 8 100GbE/40GbE QSFP28 that support Media Access Control Security (MACsec)

  • 48 25GbE/

    10GbE/1GbE SFP28 that support MACsec

Two 850-W AC power supplies with front-to-back airflow, indicated by a Juniper Gold ejector lever.

Five fan modules with front-to-back airflow, indicated by the label AIR OUT and a Juniper Gold handle.

QFX5120-

48YM-AFI

  • 8 100GbE/40GbE QSFP28 that support MACsec

  • 48 25GbE/

    10GbE/1GbE SFP28 that support MACsec

Two 850-W AC power supplies with back-to-front airflow, indicated by a Juniper Azure Blue ejector lever.

Five fan modules with back-to-front airflow, indicated by the label AIR IN and a Juniper Azure Blue handle.

QFX5120-

48YM-DC-AO

  • 8 100GbE/40GbE QSFP28 that support MACsec

  • 48 25GbE/

    10GbE/1GbE SFP28 that support MACsec

Two 850-W DC power supplies with front-to-back airflow, indicated by a Juniper Gold ejector lever.

Five fan modules with front-to-back airflow, indicated by the label AIR OUT and a Juniper Gold handle.

QFX5120-

48YM-DC-AI

  • 8 100GbE/40GbE QSFP28 that support MACsec

  • 48 25GbE/

    10GbE/1GbE SFP28 that support MACsec

Two 850-W DC power supplies with back-to-front airflow, indicated by a Juniper Azure Blue ejector lever.

Five fan modules with back-to-front airflow, indicated by the label AIR IN and a Juniper Azure Blue handle.

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

  • 650-W and 850-W power supplies in the same QFX5120-48T chassis.

  • Power supplies with different airflow directions in the same chassis.

  • Fan modules with different airflow directions in the same chassis.

  • Power supplies and fan modules with different airflow directions in the same chassis.

QFX5120 Switch Hardware and CLI Terminology Mapping

This topic describes the hardware terms used in QFX5120 switch documentation and the corresponding terms used in the Junos OS CLI (see Table 5).

Table 5: CLI Equivalents of Terms Used in the Documentation for QFX5120 Switches

Hardware Item (CLI)

Description (CLI)

Value

Item in Documentation

Additional Information

Chassis

One of the following:

  • QFX5120-

    32C

  • QFX5120-

    48T-CHAS

  • JNP48Y8C

    -CHAS

  • QFX5120-

    48YM-8C

Switch chassis

QFX5120 Switch Models and Variants

Routing Engine (n)

One of the following:

  • RE-QFX5120-

    32C

  • RE-QFX5120-

    48T-6C

  • RE-QFX5120-

    48Y-8C

  • RE-QFX5120-

    48YM-8C

  • n is a value in the range 0 through 1 for a switch that is part of a Virtual Chassis.

  • On a standalone switch, the default value is 0.

Routing Engine

FPC (n)

Abbreviated name of the Flexible PIC Concentrator (FPC)

One of the following:

  • QFX5120

    -32C

  • QFX5120

    -48T-CHAS

  • JNP48Y8C

    -CHAS

  • QFX5120-

    48YM-8C

  • n is a value in the range 0 through 1 for a switch that is part of a Virtual Chassis.

  • On a standalone switch, the default value is 0.

In QFX5120, FPC refers to the switch itself.

Understanding Interface Naming Conventions

Xcvr (n)

Abbreviated name of the transceiver

n is a value equivalent to the number of the port in which the transceiver is installed.

Optical transceivers

QFX5120 Network Cable and Transceiver Planning

Fan tray (n)

QFX5120-32C

Fan module

QFX5120 Cooling System

One of the following:

  • QFX5120-32C Fan Tray n, Front to Back Airflow - AFO

  • QFX5120-32C Fan Tray n, Back to Front Airflow - AFI

n has a value 0 through 5, corresponding to the fan module slot number.

QFX5120-48T

One of the following:

  • Fan-board Fan Tray n, Front to Back Airflow - AFO

  • Fan-board Fan Tray n, Back to Front Airflow - AFI

n has a value 0 through 4, corresponding to the fan module slot number.

QFX5120-48Y

One of the following:

  • fan-ctrl-n, Front to Back Airflow - AFO

  • fan-ctrl-n, Back to Front Airflow - AFI

n has a value 0 through 4, corresponding to the fan module slot number.

QFX5120-48YM

One of the following:

  • Fan-board Fan Tray n, Front to Back Airflow - AFO

  • Fan-board Fan Tray n, Back to Front Airflow - AFI

n has a value 0 through 4, corresponding to the fan module slot number.

Power Supply (n)

QFX5120-32C

One of the following:

  • QFX520048Y

    -650W-AC

    -AFI

  • QFX520048Y

    -650W-AC

    -AFO

n has a value 0 through 1, corresponding to the power supply slot number.

Power supply

QFX5120 Power System

QFX5120-48T

One of the following:

  • JPSU

    -650W-AC

    -AO

  • JPSU

    -650W-AC

    -AI

  • JPSU

    -850W-HV

    -AFO

  • JPSU

    -850W-HV

    -AFI

  • JPSU

    -650W-DC

    -AFO

  • JPSU

    -650W-DC

    -AFI

QFX5120-48Y

One of the following:

  • JPSU

    -650W-AC

    -AO

  • JPSU

    -650W-AC

    -AI

  • JPSU

    -650W-DC

    -AFO

  • JPSU

    -650W-DC

    -AFI

QFX5120-48YM

One of the following:

  • JPSU

    -850W-AC

    -AFO

  • JPSU

    -850W-AC

    -AFI

  • JPSU

    -850W-DC

    -AFO

  • JPSU

    -850W-DC

    -AFI

Caution

Do not mix:

  • AC and DC power supplies in the same chassis.

  • 650-W and 850-W power supplies in the same QFX5120-48T chassis.

  • Power supplies with different airflow directions in the same chassis.

  • Fan modules with different airflow directions in the same chassis.

  • Fan modules and power supplies with different airflow directions in the same chassis.