Panasonic KX-TD500 System Reference Manual page 1473

5.03 PITS and ATT Test procedure
A PITS and an ATT test can be done according to the
following three test formats.
(a) => D N d d d d
Directory number (three or four
(Example) => DN 4000
Executing DN4000 Port Test
=> DN4000
2 ***** Executing
3
1 COMMON 2 3
4
(b) => Aa
Attendant console number (1,2 or *)
PITS and ATT test can be done by entering physical port
number of PITS or ATT
(c) => x y y zz
Port number (01 to 16, or **)
Card number (01 to 14 or **)
Shelf number ( 1: Basic 2: Expansion 1
digits)
4 5 6 HRD CPY 7
3: Expansion 2)
15-F-13
8