This document outlines the testing, validation, and training activities carried out for the SDH and DWDM platforms in the context of the Proximus optical transport network. The main focus was on Ericsson SDH nodes (SPO 1460 and SPO 1410), Huawei OSN series (OSN 8800/1800/6800/9800), and high-capacity DWDM deployments using 10G/40G/100G/200G modulation technologies.

· Standalone testing of Ericsson SPO 1460 & SPO 1410 Network Elements (NEs)

· Cross-connect setup and validation

· Performance monitoring and analysis (PM)

· Protection mechanisms (MSP 1+1): STM-1o, STM-1e, STM-4, STM-16, STM-64

· Switch time validation under protection events

· Stability testing under full load conditions

· Switch matrix redundancy validation

· Ring topology tests (SNCP, MS-SPRing for 2 and 4 fibers at STM-16 and STM-64)

· NE synchronization test procedures

· Switch command prioritization and response handling

· Minimum switching quality validation with card replacement scenarios

· Synchronization accuracy in ring networks

· 2 Mbit/s retiming precision verification

· DCC (Data Communication Channel) testing

· Scheduled maintenance testing

· Power load testing, UPS integration, and SFP hot-swap validation

· Jitter & electrical interface testing

· Optical tests including eye diagram measurement and pulse shape analysis

· Wavelength spectrum width and stability verification

DWDM transport layer validation involved Huawei OSN 9800 and advanced modulation formats including NRZ, OOK, DQPSK, and DP-DQPSK. Ring design and spectrum optimization were verified in line with ROADM deployment practices.

· System validation with 10 Gbit/s NRZ, 40 Gbit/s OOK DQPSK, and 100 Gbit/s DP-DQPSK modulation

· 200 Gbit/s 16-QAM modulation for high-capacity transport channels

· ROADM design and integration: lambda routing, add/drop wavelength assignment, and spectrum stability tests

· Validation of OTU-1, OTU-2, OTU-3, OTU-4, and OTU-Flex configurations

· OCH trail creation and path-level configuration

· Lambda tuning and span optimization

· Testing of Ethernet over SDH, OTN signal encapsulation

· Routing protocol validation (OSPF, IS-IS, OSI stack configurations)

In addition to field and lab validation, design and support tasks were provided to solution engineers, including:

· DWDM and SDH topology setup and optical path design

· Span engineering and OSN/ROADM trail configuration

· Technical support for power budget calculation and link loss modeling

· End-to-end integration support including UPS & U16 solutions

· On-site and remote training for Operations Engineers on SDH technologies and procedures

This validation and support program was critical to the success of the high-reliability SDH and DWDM backbone maintained by Proximus. The tests ensured resilience, synchronization integrity, and spectral efficiency across legacy and next-gen optical platforms.