3Com T1/PRI manual Menu Option 1 Checking power-up self test status, Ram

4-2CHAPTER 4: DUAL T1/PRI STATUS DISPLAYS

Menu Option 1 Checking power-up self test status

Upon power-up, the T1/PRI software performs various tests to ensure proper operation of the Network Application Card (NAC) hardware. Selecting option 1 from the status menu displays the results for these tests:

■RAM

This test fills the SRAM of the NAC with a pattern sequence, and then performs a comparison check. The failure level for this test is Critical.

■Flash ROM

This test performs a CRC check on the Flash ROM. The failure level for this test is Critical.

■Non-maskable Interrupt

This is a write-to-ROM test that results in a non-maskable interrupt (NMI). Any attempt to write to ROM causes the NMI test code to run. The failure level for this test is Non-critical.

■Watch Dog

This test verifies the watch-dog circuitry on the NAC functions properly. The failure level for this test is Non-critical.

■Management Bus UART

This is a simple loopback test to verify that the UART that communicates with the management bus functions properly. The failure level for this test is Non-critical.

■User Interface UART

This is a simple loopback test to verify that the UART that communicates with the UI port functions properly. The failure level for this test is Non-critical.

■Time/Space Switch

The NAC’s software runs two built-in self-tests of the time space interchange (TSI), as well as a write/read test of the TSI registers. The failure level for this test is Non-critical.

■Framer 1/2

The T1/PRI software performs various diagnostic exercises to test the framer chips. The failure level for this test is Non-critical.