User Guide
Page 23
...660N-TxA, P-660HN-T1H, P660HNU-Tx and P-660HU-Tx (x stands for example P-660HN-T1, denote a device that works over the analog telephone system, POTS (Plain Old Telephone Service). Only use firmware for everyday management of the product name format. • "H" denotes an integrated 4-port ... that works over ISDN (Integrated Services Digital Network) or T-ISDN (UR-2). The ZyXEL Device is an auto-configuration server used for troubleshooting by service engineers. • FTP for firmware upgrades and configuration backup/restore. • TR-069. Refer to the following methods...
...660N-TxA, P-660HN-T1H, P660HNU-Tx and P-660HU-Tx (x stands for example P-660HN-T1, denote a device that works over the analog telephone system, POTS (Plain Old Telephone Service). Only use firmware for everyday management of the product name format. • "H" denotes an integrated 4-port ... that works over ISDN (Integrated Services Digital Network) or T-ISDN (UR-2). The ZyXEL Device is an auto-configuration server used for troubleshooting by service engineers. • FTP for firmware upgrades and configuration backup/restore. • TR-069. Refer to the following methods...