Diagnostics & Troubleshooting - ZyXEL Communications U-336S User Manual

10
Diagnostics &
Troubleshooting
Diagnostics
The U-336S is equipped with several diagnostic capabilities:
• Power-on Self Test.
• Analog Loop-back Test.
• Analog Loop-back with Self-Test.
• Local Digital Loop-back Test.
• Remote Digital Loop-back Test.
• Remote Digital Loop-back with Self-Test.
The diagnostic tests listed above apply to several modes of
operation: asynchronous or synchronous, error controlled or non-
error controlled, data compression enabled or disabled data mode.
You can use these capabilities to verify the line condition and the
modem's functioning and performance, and to locate the source of a
communication problem.
Power-On Self Test
At each power-up or upon a reset command from the panel, the
modem will test the ROM code checksum, system RAM memory,
128 Diagnostics & Troubleshooting