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Optical ILA System Overview


Optical Inline Amplifier Description

The Juniper Networks Optical Inline Amplifier is a stand-alone erbium-doped fiber amplifier (EDFA) with dual AC or DC power supplies. The optical inline amplifier (ILA) supports bidirectional optical inline amplification. The optical ILA provides periodic amplification of a dense wavelength-division multiplexing (DWDM) signal to enable long-distance transmission as it propagates along the fiber-optic cable. Optical ILAs are typically placed between 50 miles (80 km) and 62 miles (100 km) apart along the length of the fiber. They are used in conjunction with the integrated photonic line cards (IPLCs) that are installed in the Juniper Networks PTX3000 Packet Transport Routers. An optical ILA connects to an IPLC through the LINE IN and LINE OUT LC port connectors on the front panel. It also connects to other optical ILAs through the same LC port connectors.

The optical ILA operates with redundant hot-swappable pluggable power supplies that are either AC or DC. The optical ILA can be managed by using Connectivity Services Director (CSD), or by using the CLI console commands. The optical ILA does not run the Juniper Networks Junos operating system (Junos OS).

Starting with Junos OS release 17.1, you can control and manage optical inline amplifiers (ILA) over the optical supervisory channel (OSC) of the PTX3000 integrated photonic line system. For information about managing the ILAs over the OSC of the the IPLCs, see the Integrated Photonic Line Card (IPLC) System User Guide.

Figure 1 shows a point-to-point configuration with the optical ILA and IPLC.

Figure 1: Point-to-Point Configuration
Point-to-Point Configuration

In this example, the optical ILA is connected to the IPLC in the PTX3000 chassis, which is connected to compatible PICs in the same chassis through the add and drop ports. The multiplexed wavelengths from the IPLC are amplified and transmitted in a single fiber toward the line (through the Line OUT port on the IPLC), which is connected to the optical ILA (through the LINE IN port on the ILA). Based on the distance, you can have multiple ILAs connected. In this example, there are three ILAs to enable long-distance transmission.

For more information about the IPLCs, see the PTX3000 Packet Transport Router Hardware Guide. For information about configuring the IPLCs, see the Integrated Photonic Line Card (IPLC) System User Guide.

Front Panel

The front panel of the optical ILA contains six LC port connectors, the ON/OFF button, the console and management ports, the system status LEDs, and the USB ports. Figure 2 shows the front panel of the optical ILA.

Figure 2: Optical ILA Front Panel
Optical ILA Front Panel
Status LEDs
Management (MGMT) Ethernet port
LC port connectors
Console (CON) port
USB (USB) port
On/off button (ON/OFF)
USB (USB) port

FRU Panel

The field-replaceable unit (FRU) panel of the optical ILA contains the fan modules and power supplies for the optical ILA. Figure 3 shows the FRU panel on the optical ILA.

Figure 3: Optical ILA FRU Panel
Optical ILA FRU Panel
Grounding points
Fan modules
ESD point
Power supplies

The cooling system in an optical ILA consists of three 12.4-W fan modules. These fan modules can be hot-swapped—you do not need to power off the optical ILA or disrupt the functioning of the optical ILA to replace a fan module. The optical ILA has two 150-W power supplies, either AC or DC depending on your configuration. The power supplies need to be both AC or both DC. Only one power supply is required to power the device, while the second power supply provides redundancy.

Optical ILA Hardware Component Overview

Table 1 describes the hardware components of the optical ILA.

Table 1: Optical ILA Hardware Components


Spare Model Number






Optical ILA Chassis Description

Fan module


Optical ILA Cooling System Description

Power supplies


Optical ILA AC Power Supply Description


Optical ILA DC Power Supply Description

Optical ILA Component Redundancy

The following hardware components provide redundancy on the optical ILA models:

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

  • The optical ILA ships with two power supplies that provide 1+1 redundancy. If one power supply fails or is removed, the second power supply balances the electrical load without interruption and still provides 1+1 redundancy while the failing power supply is replaced.

Optical ILA Field-Replaceable Units

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


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

Table 2 lists the FRUs for the optical ILA and actions to take before removing them.

Table 2: Required Actions Before Removing a FRU from the Optical ILA


Required Actions Before Removal

Power supplies (2)

Disconnect the AC power and remove the AC power cord or cable for the power supply unit.

Disconnect the DC power and remove the power connector.

Note: You need a minimum of one powered power supply for the optical ILA to operate properly.

Fan modules (3)


Figure 4 shows the FRU panel on an optical ILA.

Figure 4: Optical ILA FRU Panel
Optical ILA FRU Panel
Fan modules
ESD point
Power supplies

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.