Use the same setting for both switches. ♦ To convert to a 75 Q Balanced Circuit, set both switches to the Open position. ♦ To convert to a 75 Q Unbalanced Circuit, set both switches to the Earthed position. CUSTOMER SERVICE For sales, support, Customer and Product Service (CAPS) requests, or further information, contact one of the following numbers: ADTRAN, Inc. Attention: International Department 901 Explorer Boulevard Huntsville, Alabama 35806 USA 1 256 963-8000 voice 1 256 963-6300 fax adtran. com international@adtran.com Warranty: ADTRAN will replace or repair this product within the warranty period if it does not meet its published specifications or fails while in service. Warranty information can be found online at www.adtran.com/warranty....