User Guide
Page 39
... system, POTS (Plain Old Telephone Service). P-662H/HW-D Series User's Guide 39 " All wireless features in "1", for your ZyXEL Device's specific model. Models ending in "3" denote a device that works over T-ISDN (UR-2). 1 Only use firmware for example P-662HW-D1, denote a device that works over ISDN (Integrated Services Digital Network). CHAPTER 1 Getting To Know Your...
... system, POTS (Plain Old Telephone Service). P-662H/HW-D Series User's Guide 39 " All wireless features in "1", for your ZyXEL Device's specific model. Models ending in "3" denote a device that works over T-ISDN (UR-2). 1 Only use firmware for example P-662HW-D1, denote a device that works over ISDN (Integrated Services Digital Network). CHAPTER 1 Getting To Know Your...