Diagnostics; Power-On Self-Test - ZyXEL Communications omni TA128 User Manual

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
Seq. LNK
on*
1
off
2
off
3
off
4
: The LED lights up while test is in progress and blinks if a test
O O
NOTE
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
LED LED
B1 B2
off off
on* off
off on*
off off
LED Test Description
AA
off Memory test
off ISDN chip interface test
off ISDN chip functional test
on* HDLC functional test