Industrial networking multiplexer Adtran TSU. We've been told that this is to connect your LAN equipment to a T1 broadband data line. This is marked with part number "1200.060L1". We powered this up and it successfully completes the Self-Test and boots.  We don't know much about this, if you have questions, please ask. We're including a 10 ft long data cable.

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Item No. w91405