KX-NS5180X-SX, KX-NS5180XSX - Panasonic PBX Service Manual (repair manual). Page 10

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Configured by the photo couplers (PC100/101) that enable to detect each current in Tip 

 Ring, Ring  Tip direction. PC101 is

used in common as the bell detection photo coupler. Using software, it stores the current direction (the detected photo coupler) at
acquiring ilne and recognizes the action by changing of the current direction (the detected photo coupler changes).

When the current flows in the direction of Ring to Tip, PC100 4-pin (BELLDET) is Low and PC101 4-pin (REVDET) is High.

1. Ring 

 L100  R103  PC100  D104  Q100(C-E)  R112  D104  RL101  L100  Tip

When the current direction (polarity) is reversed from Tip to Ring, PC100 4-pin (BELLDET) is High and PC101 4-pin (REVDET)
turns to Low level. It recognizes the action by changing of the current direction (the detected photo cpupler changes).

2. Tip 

 L100  RL101  D104  R112  Q100(C-E)  D104  PC101  R103  L100  Ring

Pattern 1

BELL

 DET

REV DET

Pattern 2

BELL

 DET

REV DET

OFF HOOK

REVERSE

OFF HOOK

REVERSE

BELLDET (To DSP(IC101))

REVDET (To DSP(IC101))

+

-

-

-

+

-

+

-

REVDET[0]

VIN[0]

VOUT[0]

SHNT[0]

SHNT[0]

DP[0]

PC103A

1

2

3

4

R126A

SA100A

1

2

3

AL2

R103A

C110A

R112A

R115A

RL100A

NC

1

2

2

3

4

R102A

DG

DG

C104A

PC101A

1

2

3

4

C111A

R118A

DG

C109A

ZNR100A

+3.3V

+3.3V

R101A

+3.3V

RL101A

1

3

4

DG

DG

C112A

R106A

D104A

1

3

4

2

R117A

R125A

C113A

D109A

1

3

2

DG

SFG

R116A

D101A

+3.3V

PC100A

1

2

4

3

FG

VH1

VH1

C103A

R109A

D103A

VH1

R110A

+15V

+3.3V

TH100A

C105A

D110A

SFG

C102A

R121A

T100A

3

1

4
5
6

+3.3V

R108A

R171A

+3.3V

L100A

1

4

2

3

C138A

C139A

J100A

R122A

R124A

IC100A

4

VEE

8

VCC

Q100A

R113A

IC100A

3

2

1

IC100A

5

6

7

C107A C145A

C106A

R119A

R120A

R123A

R127A

R132A

R133A

C108A

C121A

C120A

A