Catalog > Manufacturer > AdTran   Product Type Part Number Description Detail Price External Modems 1200.060L1 AdTran TSU Unit Ext. $69.00 External Modems 1200.062L1 AdTran 56/64 DSU Ext. $46.00 External Modems 1202.081L6 ISU Express Data/Pots/MPPP New $78.00 Hardware Books MPNISUEX ISU Express User Manual Paperback $23.00 Copyright © 1996-2018 Computer Parts Galore. All rights reserved.