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PTX1000 System Overview

PTX1000 Packet Transport Router Description

The Juniper Networks PTX1000 Packet Transport Router is a fixed-configuration router that supports 10-Gbps, 40-Gbps, and 100-Gbps port speeds in a compact 2U form factor, enabling service providers to organically distribute peering points throughout the network.

The system architecture cleanly separates control operations from packet forwarding operations. This design eliminates processing and traffic bottlenecks, permitting the PTX1000 to achieve high performance.

  • Control operations are performed by the Routing Engine, which runs the Juniper Networks Junos operating system (Junos OS). The Routing Engine handles routing protocols, traffic engineering, policy, policing, monitoring, and configuration management. Junos OS is installed on the PTX1000 router’s internal 2 x 64-gigabyte (GB) M.2 SATA solid-state drives (SSDs). The 64-GB SSDs have 50 GB of usable space—the remaining space is reserved. The Routing Engine is enhanced by a 2.5-GHz quad core Intel CPU and 32 GB of SDRAM.


    The 2 x 64-GB SSDs installed in the PTX1000 support the request vmhost snapshot command, which creates a recovery snapshot of the currently running and active file system partitions, and request vmhost snapshot recovery command, which recovers the primary disk from the snapshot content stored in the backup disk. In addition, the 64-GB SSDs support enhanced hardware resiliency through storage partitioning and redundancy.

    Earlier versions of the PTX1000 have 2 x 32-GB M.2 SATA SSDs. PTX1000 routers with 32-GB SSDs do not support the request vmhost snapshot and request vmhost snapshot recovery commands, and do not support enhanced hardware resiliency. To determine the size of the SSDs installed in your device, issue the show vmhost hardware CLI command. The capacity of Disk1 and Disk2 is displayed in the output as 32.0 GB if 32-GB SSDs are installed, and the capacity is displayed as 50.0 GB if 64-GB SSDs are installed. See the Junos OS Software Installation and Upgrade Guide for more information.

  • Forwarding operations are performed by the Packet Forwarding Engines, which include ASICs designed by Juniper Networks. The custom ExpressPlus ASICs enable the PTX1000 to provide up to 2.88 terabits per second (Tbps) of forwarding capacity. The ExpressPlus ASICs are connected to Hybrid Memory Cubes (HMCs). These high-efficiency memory modules provide packet buffering, virtual output queue (VOQ) memory, and improved logical system scale.


For information about features supported on PTX Series routers, see Feature Explorer.

Benefits of the PTX1000 Router

  • Increased scalability—The PTX1000 scales to 3 Tbps in a single chassis, supporting up to 288 10-Gigabit Ethernet interfaces, 72 40-Gigabit Ethernet interfaces, and 24 100-Gigabit Ethernet interfaces, giving service providers the performance and scalability needed as networks grow. The purpose-built ASICs in the PTX1000 provide enhanced packet processing for both full IP functionality and MPLS transport, accommodating scale as traffic continues to increase and optimizing IP/MPLS transit functionality.

  • Space efficiency—Providing high capacity in a compact 2U form-factor, the PTX1000 meets installation needs for peering Internet exchange points, peering collocations, central offices, and regional networks, especially in emerging markets.

  • Always-on infrastructure base—The PTX1000 is engineered with full hardware redundancy for cooling, power supplies, and forwarding, allowing service providers to meet stringent service-level agreements across the core.

Port Panel and Management Panel

The port panel of the PTX1000 contains 72 network ports and port LEDs. The management panel of the PTX1000 contains console and management ports, a reset button, system status LEDs, clocking ports, and a USB port. Figure 1 shows the PTX1000 port panel and management panel.

Figure 1: PTX1000 Port Panel and Management PanelPTX1000 Port Panel and Management Panel
Port panel
Management panel

Each of the 72 network ports on the port panel supports quad small form-factor pluggable plus (QSFP+) transceivers, and is configured as a channelized 4 x 10-Gigabit Ethernet interface by default (for a maximum of 288 10-Gigabit Ethernet ports). You can configure each of the 72 ports as a 40-Gigabit Ethernet interface. You can also configure 24 of the 72 network ports as 100-Gigabit Ethernet interfaces. Table 1 describes the maximum number of ports for each interface type supported by the PTX1000.

Table 1: Maximum Supported Ports at Each Interface Speed

Interface Type

Maximum Supported Ports

10-Gigabit Ethernet


40-Gigabit Ethernet


100-Gigabit Ethernet



You can purchase a licensed model of the PTX1000 that allows you to use 18 of the 72 network ports. You can use 18 ports in any combination, for a maximum of 72 10-Gigabit Ethernet interfaces, 18 40-Gigabit Ethernet interfaces, or 6 100-Gigabit Ethernet interfaces. You can purchase additional licenses to enable the remaining network ports. Each license enables an additional 18 of the 72 total network ports.

You manage the PTX1000 by using the Junos OS CLI, which is accessible through the console and out-of-band management ports on the management panel. In addition, the management panel has system status LEDs that alert you to minor or major alarms or other issues with the router, external clock synchronization ports, and a USB port to support software installation and recovery.

For more information about the port and management panels, see PTX1000 Port Panel and PTX1000 Management Panel.

FRU Panel

The field-replaceable unit (FRU) panel of the PTX1000 contains the fan modules and power supplies for the PTX1000. Figure 2 shows the PTX1000 FRU panel.

Figure 2: PTX1000 FRU PanelPTX1000 FRU Panel
Power supplies (4)
ESD point
Fan modules (3)

The cooling system in a PTX1000 consists of three 80-W fan modules that operate at 150 cubic feet per minute (CFM) at full speed as well as fans housed in the power supplies. Each fan module has dual counter-rotating fans. These fan modules can be hot-swapped—you do not need to power off the router or disrupt routing function to replace a fan module.

In the PTX1000 cooling system, cool air enters through the vents in the port panel and hot air exhausts through the FRU panel. This type of airflow is known as airflow out or port-to-FRU airflow.

The PTX1000 has four 1600-W power supplies, either AC or DC depending on your configuration. Each power supply provides 12-VDC output with a standby voltage of 12 VDC. The power supplies can be hot-swapped—you do not need to power off the router or disrupt routing function to replace a power supply

For more information about the components on the FRU panel, see PTX1000 Cooling System Description, PTX1000 AC Power Supply Description, and PTX1000 DC Power Supply Description.

PTX1000 Hardware Component Overview

The PTX1000 supports the components in Table 2 listed in alphabetic order. See PTX1000 Physical Specifications for the dimensions and weight of the PTX1000.

Table 2: PTX1000 Hardware Components


Spare Juniper Model Number

CLI Output





PTX1000 Packet Transport Router Description

Fan module


PTX1000 Fan Tray

PTX1000 Cooling System Description

Power supplies



PTX1000 AC Power Supply Description



PTX1000 DC Power Supply Description

PTX1000 Component Redundancy

The following hardware components provide redundancy on PTX1000 models:

  • Cooling system—The PTX1000 has three fan modules. Each fan module is a redundant unit containing two fans. If a fan module fails and the remaining fan modules are unable to keep the PTX1000 within the desired temperature thresholds, chassis alarms are raised and the PTX1000 might shut down.

  • Power supplies—The PTX1000 is shipped with four power supplies. A PTX1000 provides for twice the number of power supplies needed to power all the components in the router, which is known as 2N redundancy. If one power supply fails or is removed, the remaining power supplies balance the electrical load without interruption and still provide N + 1 redundancy while the failing power supply is replaced.

    For power feed redundancy, connect power source feed A to power supplies 0 and 1 and connect power source feed B to power supplies 2 and 3. A single feed can provide power to all components in the PTX1000.


    Do not connect feed A and feed B to the same power supply input terminal.

PTX1000 Field-Replaceable Units

Field-replaceable units (FRUs) are components that you can replace at your site. The PTX1000 FRUs are hot-removable and hot-insertable—you can remove and replace them without powering off the PTX1000 or disrupting the routing function.


Replace a failed fan module with a new fan module within 30 seconds of removal to prevent chassis overheating.

Table 3 lists the FRUs for the PTX1000 and actions to take before removing them.

Table 3: Required Actions Before Removing a FRU from the PTX1000


Required Actions Before Removal

Power supplies (4)

Remove the power cord or cable for the power supply unit.


You need a minimum of two powered power supplies for the PTX1000 to operate properly.

Fan modules (3)


Optical transceivers

None. We recommend that you disable the interface by using the set interfaces interface-name disable command before you remove the transceiver. See Disconnecting a Fiber-Optic Cable from the PTX1000.

See Figure 3 for the location of the power supplies and fan modules on the FRU panel of the PTX1000.

Figure 3: FRUs on the FRU Panel in a PTX1000FRUs on the FRU Panel in a PTX1000
Power supplies (4)
Fan modules (3)

If you have a Juniper Care service contract, register any addition, change, or upgrade of hardware components at . Failure to do so can result in significant delays if you need replacement parts. This note does not apply if you replace existing components with the same type of component.