ADTRAN 1291021L2 Termination Unit Circuit Board

The ADTRAN TRDDS-R 1291021L2 Termination Unit Circuit Board is a two-wire termination card designed for ADTRAN Total Reach DDS-R remote termination systems. This 1291021L2 circuit board is intended for indoor DDS deployments and fits in standard ADTRAN T200 or T400 shelves, or the single-mount housing 1212007L1, to terminate a DDS two-wire link at the remote end. As part of the TRDDS-R family, it provides termination for a DDS two-wire circuit and enables built-in testing capabilities to verify line integrity and performance, delivering data rates up to 64 kbps. The unit is span-powered, drawing operational power from the DDS network rather than requiring a separate local power source, which aligns with the architecture of Total Reach DDS-R installations.