ADTRAN offers a complete line of ISDN Service Units (ISUs) for terminating basic rate service from PBXs and Central Offices. The ISDN Terminal Adapters are ideal for solutions requiring speeds of 128 Kbps. Some models have built-in NT1 functionality. ADTRAN ISDN Inverse Multiplexers provide additional functionality at rates up to 512 Kbps.
The Adtran 1903022L1 is also known as
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