8 AT Command Set Summaries 77

Basic AT Command Set 77

Description of ATI2 Output: 80

Extended AT& Command Set 83

Extended AT* Command Set 89

9 Status Registers & Result Codes 92

S-Register Descriptions 92

Basic S-Registers "ATSn=x" 92

Extended S-Registers "ATSn=x" 93

Result Code Options 111

"ATXn" Result Code Option Table 111 Result Code Field Descriptions 113

Connect Strings for Error Corrected Connections 113

10 Diagnostics & Troubleshooting 116

Diagnostics 116

Power-On Self Test 117

Loopback Tests 118

Indicator Lights 119

Line Condition Status Display 120

Link Status Report (ATI2) 122

Trouble Shooting 126

AT Command Set Problems 126

Command Echo Problems 128

Answer Problems 128

Dialing Problems 129

Data Transfer Problems 130

Connect Problems 130

11 Upgrading Your Modem 131

Upgrading by Flash EPROM 131

Kernel Recovery Mode 132

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ZyXEL Communications U-336R/RE AT Command Set Summaries, Status Registers & Result Codes, Diagnostics & Troubleshooting