ADTRAN 1203384L2 Echo Canceller

ADTRAN 1203384L2 Echo Canceller is a modular ADPCM-enabled echo cancellation accessory for the Total Access 850 family, delivering G.168-compliant echo cancellation for voice links in legacy T1 deployments. Identified as Echo Canceller Module P/N 1203384L2, it is designed for use with legacy T1 RCUs (P/N 1200376L1 with ATM firmware). Echo cancellation and ADPCM resources are built into the 3rd‑Generation T1 RCUs (P/N 1203376L1) and SDSL RCUs (P/N 1200377Lx), so this module is not required when using those RCUs. In the TA-850 system, built-in echo cancellation covers up to 24 voice ports and ADPCM resources cover up to 16 ports, and the module provides dedicated echo cancellation functionality for voice over ATM applications in legacy configurations.