### PortServer II Diagnostics Test Descriptions

The following descriptions explain the test philosophy for each functional PortServer diagnostic test. The basic test is the same whether it is run from the video display or the front panel display.

Test # | Test | Test Description
1 | Front Panel Light Test | This cycles the PortServer front panel LEDs on and off. It also cycles both alphanumeric displays.
2 | Memory Test | This is a memory test. It takes about two minutes for each pass.
3 | Timer Test | This ensures that the timer counts and interrupts. It tests the real-time clock, checking the set time for legal values and tests the battery-backed RAM in real-time clock.
4 | Built-in UART and External EBI Internal Loopback Test | This test ensures that the UARTs interrupt and that data loops back.
5 | Built-In UART and External EBI External Loopback Test | This test is the same as Test 4, but uses an external loopback (required for the test to pass). From the front panel, press the right pushbutton (>) to select the port to test. The display will cycle from 01 to 16 (or higher, if you have expansion modules connected) plus All. With the number of the port to test displayed, press the left pushbutton (<) to start the test.
6 | Ethernet Internal Loopback Test | This tests the 10BaseT and 10Base2 circuits within PortServer II.
7 | Ethernet External Loopback Test | This verifies correct operation of the Ethernet interfaces to the external network. You must have a dummy network (for example, a "T" connector with termination resistors) attached to each Ethernet connector for this test to pass.
8 | Flash ROM Test | (Read Only) This verifies that the Flash ROM can be read.
9 | Watchdog Timer Test | This checks out the watchdog timer used to check system reliability.