Panasonic KX-TDA600BX Service Manual page 63

11.1.1.1. Local Loop Back Diagnosis
Daignose faults by transmission of the data from the EMPR to the Option Card and back using the Loop back test.
Since loopback points differ from each card, they consist of loopback tests of the following items:
Primary circuit
Framer IC ST path (Analog)
Framer IC (Digital)
ASIC CODEC (PITS)
Local HW I/F point
Local TSW point
OK
NG
11.1.1.2. DTMF Receive Test
Diagnostic test for DTMF receiver
OK
NG
11.1.1.3. PT Loop Back Diagnosis
Diagnostic test for PT by Loop back test
PT loop back diagnostic test channel
Cch port xx
Dch port xx
Bch port xx
PT loop back diagnostic test
Primary circuit
ASIC (PT I/F)
OK
NG
Local loop back diagnosis test
Primary circuit loop back test
IC Analog I/F loop back test
IC Digital I/F loop back test
PITS I/F test loop back
Local HW I/F loop back test
Local TSW loop back test
Diagnosis result of every test points
loop back diagnosis OK
loop back diagnosis NG
Diagnosis result
DTMF receive test OK
DTMF receive test NG
C channel Port No.xx test
D channel Port No. xx test
B channel Port No. xx test
Primary circuit loopback test
PT I/F loopback test
Diagnosis result
PT loop back diagnosis OK
PT loop back diagnosis NG
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