ZyXEL Omni TA 128 User Guide - Page 116

Diagnostics

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15 Diagnostics This chapter provides diagnostic tables for the TA128. The TA128 can perform its own diagnostic tests, providing you with valuable information. Diagnostics The TA128 ISDN TA provides several diagnostic capabilities: • Power-on Self-test • Local Digital Loopback Test • Diagnostic Command • TA128 Reset Power-on Self-test At each power-up or upon a reset command from the panel, the TA will test the ROM code checksum, system RAM memory, EEPROM, digital circuits and analog circuit calibrations. The following table is a summary of the TA128's self-tests: Test LED LED LED LED Test Description Seq. LNK B1 B2 AA 1 on* off off off Memory test 2 off on* off off ISDN chip interface test 3 off off on* off ISDN chip functional test 4 off off off on* HDLC functional test O NOTE: The LED lights up while test is in progress and blinks if a test fails. The LNK LED will light up for half a second to indicate the success of the TA128's power on self-test. After this, the LNK LED will become the normal physical layer (layer 1) active indicator. 104

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104
15
Diagnostics
This chapter provides diagnostic tables for the TA128. The TA128
can perform its own diagnostic tests, providing you with valuable
information.
Diagnostics
The TA128 ISDN TA provides several diagnostic capabilities:
•
Power-on Self-test
•
Local Digital Loopback Test
•
Diagnostic Command
•
TA128 Reset
Power-on Self-test
At each power-up or upon a reset command from the panel, the TA
will test the ROM code checksum, system RAM memory,
EEPROM, digital circuits and analog circuit calibrations.
The following table is a summary of the TA128's self-tests:
Test
Seq.
LED
LNK
LED
B1
LED
B2
LED
AA
Test Description
1
on*
off
off
off
Memory test
2
off
on*
off
off
ISDN chip interface test
3
off
off
on*
off
ISDN chip functional test
4
off
off
off
on*
HDLC functional test
O
NOTE
:
The LED lights up while test is in progress and blinks if a test
fails.
The LNK LED will light up for half a second to indicate the success
of the TA128's power on self-test. After this, the LNK LED will
become the normal physical layer (layer 1) active indicator.