ADC 600F User Manual page 116

Returns
5 Write the ADC Wireline Systems Division address and the Return Material Authorization
Number you received from Customer Service clearly on the outside of the carton and return
to:
ADC Wireline Systems Division
14352 Franklin Ave.
Tustin, CA 92780-7013
Attention: RMA (Number)
All shipments are to be returned prepaid. ADC will not accept any collect
shipments.
106 Megabit Modem 400F, 500L, 600F, and 700F User Manual