User Guide
Page 38
...the P-2602HWL-D3A) denote a device that works over T-ISDN (UR-2). Models with "1" or "7" as the next to either half-duplex or full-duplex mode depending on your ZyXEL Device. ZyXEL Devices which work over ISDN (Integrated Services Digital Network). Note: Only use firmware for each ...standard are also auto-crossover (MDI/MDI-X) meaning they automatically adjust to the last character (like the P-2602HWL-D1A or the P-2602HWL-D7A)...
...the P-2602HWL-D3A) denote a device that works over T-ISDN (UR-2). Models with "1" or "7" as the next to either half-duplex or full-duplex mode depending on your ZyXEL Device. ZyXEL Devices which work over ISDN (Integrated Services Digital Network). Note: Only use firmware for each ...standard are also auto-crossover (MDI/MDI-X) meaning they automatically adjust to the last character (like the P-2602HWL-D1A or the P-2602HWL-D7A)...