Mfr Part 1200927F8. Manufacturer Adtran. RJ-21M (50-pin amp) to 8 RJ-48. Eliminates the need for punch down block and cable for installs requiring less than 8 analog ports. Works with all Total Access 600, 850, 900, 900e, NetVanta 6240, NetVanta 6250, and 6330 Series IADs.