User Guide
Page 21
... Introduction 1.1 Overview The ZyXEL Device is an ADSL2+ Integrated Access Device (IAD) that works over the analog telephone system, POTS (Plain Old Telephone Service). Only use a traditional analog telephone to allow you can be used to use firmware for example P-2612HNU(L)-F1, denote a device that... works over ISDN (Integrated Services Digital Network) or T-ISDN (UR-2). Ensure you know which phone this user's guide refer to the label on product specifications for making calls. The ZyXEL Device is , ...
... Introduction 1.1 Overview The ZyXEL Device is an ADSL2+ Integrated Access Device (IAD) that works over the analog telephone system, POTS (Plain Old Telephone Service). Only use a traditional analog telephone to allow you can be used to use firmware for example P-2612HNU(L)-F1, denote a device that... works over ISDN (Integrated Services Digital Network) or T-ISDN (UR-2). Ensure you know which phone this user's guide refer to the label on product specifications for making calls. The ZyXEL Device is , ...