Diagnostics & Troubleshooting; Power-On Self Test - ZyXEL Communications U-336S User Manual

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Diagnostics &
Troubleshooting
Diagnostics
The U-336S/SA 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, DSP
128 Diagnostics & Troubleshooting