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proNX Optical Director System and Optical Control Levels

 

This topic provides an overview of the optical control and management provided as part of the proNX Optical Director software. It includes the following sections:

Introduction

All products in the TCX Series Optical Transport System portfolio are controlled and managed by the proNX Optical Director. The proNX Optical Director is a highly available platform that runs on a three-node server cluster. It is an integral component of the TCX1000 Series Optical Transport System and it is the combination of the TCX1000 Series hardware and the proNX Optical Director control and management software platform that provide the full TCX Optical Transport System solution.

The proNX Optical Director control and management software abstracts the optical control layer from the TCX1000 Series managed device and moves control of the optical layer off of the managed device to a centralized and programmable optical control layer called the Juniper Programmable Photonic Layer. By disaggregating the optical control plane from the TCX1000 Series hardware, you can more regularly and flexibly modify control plane behavior while maintaining service continuity, lowering operational expense, and fine-tuning transport-layer performance.

In traditional optical networks, the optical control function resides on the device hardware and the devices exchange proprietary control messages with each other on an optical service channel (OSC). This makes interworking across vendor equipment difficult and often leads to the deployment of single-sourced networks. Moving the optical control layer to a centralized software controller makes heterogeneous networks with equipment from multiple vendors possible.

System Controls

The proNX Optical Director control and management software provides comprehensive systems control functions that:

  • Prevent or eliminate degradation of any part of the system — TCX1000 Series managed devices constantly send streams of real-time optical link measurements to the proNX Optical Director, which then uses the data to build an always current view of the optical links in the network. This allows the proNX Optical Director to make real-time control decisions on all aspects of optical link management.

  • Initiate immediate response to demands that are placed on the system — As demands are placed on the system, the proNX Optical Director evaluates the information it collects from the managed devices, calculates corrective actions and makes configurations changes to the device in order to compensate for the increased demands on the system.

  • Respond to changes in the system to meet long term requirements, such as continuous control of equipment performance — The proNX Optical Director continuously collects information from the managed devices in the network, evaluates that information and automatically makes configurations changes that may be required to any of the managed devices in the network.

Optical Control Levels

The proNX Optical Director control and management software provides three additional level of optical controls:

  • Device Control — Responsible for maintaining the optical configuration of a device. The proNX Optical Director receives streams of real-time optical link measurements from the TCX1000 Series managed device and builds an always current view of the optical links in the network. This allows the proNX Optical Director to make real-time control decisions on all aspects of optical link management. The proNX Optical Director discovers OLS network elements and reads and displays their configuration. You can change the configuration, view the equipment inventory, pull up a visual representation of the device, or view performance monitoring parameters and alarm details.

  • Span Loss Compensation — Responsible for controlling the optical path over a span (between two sites). By abstracting the optical controls from the hardware, the proNX Optical Director can read optical power levels on devices at both ends of a span, decide whether changes need to be made to the device configuration to compensate for span loss and then send commands to the hardware to make the appropriate adjustments.

  • Pass-Through Nodal Loss Measurement— Responsible for calculating the loss in the pass-through fiber connection between two TCX1000-RDM20s universal ports in a multi-degree ROADM node and reporting out-of-range (OOR) alarms to the proNX Optical Director. Pass-through nodal loss is the loss in power across the fiber between the two universal ports that form the pass-through connection between two degrees in a multi-degree ROADM node. The pass-though loss is measured within the total optical power over the pass-through fiber connection and is represented mathematically as the difference between the transmitted dBm power on the Ux Out port of one TCX1000-RDM20 and the received dBm power on the Ux In port of the other TCX1000-RDM20.

    Note

    This release of the TCX Series Optical Transport System calculates pass-through nodal loss and reports nodal loss out-of-range alarms but does not control nodal loss. If the pass-through loss calculation is not within range, Nodal loss OOR alarms are raised at both ends of the pass-through fiber connection. If a Nodal loss OOR alarm occurs, inspect and verify the pass-through fiber connections.

  • Network Control — Responsible for controlling the optical paths within an optical network (endpoint-to-endpoint). The proNX Optical Director supports A-to-Z provisioning and activation of optical services.