ADTRAN INC | 1200103L2
TSU Dual FXO Plug-In Module

MFR PART #  1200103L2
PART #  397171
Minimum 1 EACH
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The 2FXO module is one of several expansion modules for the TSU 100, TSU 600 or the HSU 100. This module should be selected when a connection to one or two voice line cards of a key system or PBX is required. PBX extensions may be extended to a remote site by combining a TSU on the remote end with FXS modules. The module emulates the CO side of a DID (Direct Inward Dial) trunk when in DPT mode. The module provides standard 2FXO or DPT functionality to distances of 2400 feet. The module installs in the slot(s) of the TSU/HSU 100 or TSU 600 products and is subject to TSU operations and control. There is a plug-on version designed to provide an additional two ports.


  • Two RJ11 2-wire analog voice ports
  • Two voice circuit connections to PBX or key system line (station) modules at distances up to 2,500 feet
  • Extends phone lines to remote sites over T1/FT1 circuits
  • Passes message waiting when used with the TSU Dual FS Plus (MW) module
  • Dial Pulse Terminate (DPT) mode emulates central office side of Direct Inward Dial (DID) trunk


UNSPSC Code 55101515

Spec Sheet

Spec Sheet

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