Panasonic KX-TD500 System Reference Manual page 1462

2.00 Test Main Menu
From the Main Menu screen, select "2. Test";
then the following "Test Main Menu" appears on
the screen.
Test Main Menu
=>
1 COMMON 2
Description
1. Card Test -------Verifies the card status.
2. Port Test --------Verifies the port status.
3. PITS and ATT Test -----Verifies the PITS and ATT(Attendant Console) status.
1. Card Test
2. Post Test
3. PITS and ATT Test
3 4 5
15-F-2
ONL TST LIN DIR
6 HRD CPY 7 8