NETGEAR XM128 ISDN - Manual (Page 89)

Troubleshooting 10-1
Chapter 10
Troubleshooting
This chapter provides quick easy-reference troubleshooting tables for the Model XM128 ISDN
Digital Modem. For troubleshooting purposes, the Model XM128 modem performs its own
diagnostic tests, which can provide information about each of its functions.
The Model XM128 modem provides several diagnostic capabilities:
• Power-on self-test
• Local digital loopback tests
• Diagnostic command
• Modem reset
Power-on Self-test
At each power-up sequence or upon a reset command from the panel, the Model XM128 modem
tests the ROM code checksum, system RAM memory, EEPROM, digital and analog circuit
calibrations, and analog circuit calibrations.
Table 10-1 summarizes the power-on self-test of the Model XM128 modem.
Table 10-1. Power-on self-test
Test Sequence 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