Panasonic KX-HT82480 / KX-HT82470 / KX-HT82460 Service Manual ▷ View online
17
KX-HT82480/82470/82460 Series
4.2.2.3.
2W-4W Conversion
It converts 4W-VOX signal used in the PBX to 2W-VOX signal used in SLT, and vice versa. It consists of an operational amplifier in
the SLIC and a balanced network (B/N) in the CODEC. It can control the return loss of the audio data and frequency characteristics.
By modifying the CODEC program, it can match the corresponding impedance.
the SLIC and a balanced network (B/N) in the CODEC. It can control the return loss of the audio data and frequency characteristics.
By modifying the CODEC program, it can match the corresponding impedance.
4.2.2.4.
DTMF Signal Detection
Each port has its own DTMF receiver in the code.
Detection of DTMF signal by codec transmits this data to the CPU board via the PLD.
Via the PLD, CPU board reads the DTMF signal which is received in the codec.
Detection of DTMF signal by codec transmits this data to the CPU board via the PLD.
Via the PLD, CPU board reads the DTMF signal which is received in the codec.
C730A
C729A
R711A
R712A
R714A
R713A
C732A
R708A
R707A
R710A
R709A
D702A
C713A
R710B
R709B
R708B
R707B
D702B
D700A
D701A
D701B
D700B
+3.3V_SLIC
DG
R719A
DG
DG
C722A
CL700A
DG
CL701A
C725A
R716A
CL703B
CL704A
UHW1
CL703A
FH_HW1
CL702A
DHW1
+15V
R718A
DG
C711A
+15V
DG
DG
FG
DG
DG
DG
C718A
DG
DG
CL701B
DG
C716A
C717A
C720A
DG
C723A
DG
R703B
C719A
R700B
nINT_IN0
R700A
C700B
DOUT0
nRESET_OUT0
DG
R703A
DG
C712A
C700A
DG
DG
DG
SCLK0
DG
CS_SPI00
R717A
DIN0
C721A
DG
CL700B
+3.3V_SLIC
CL704B
+1.5V
DG
CL702B
DG
C733A
C715A
C714A
CLK_HW1
C705A
C705B
R704A
R704B
DG
*C708A
DG
*C736A
*C708B
*C736B
DG
C709A
C709B
C710B
C710A
*C706B
*C706A
D703B
D704B
D703A
D704A
FG
L700B
L700A
*C737B
DG
DG
*C737A
DG
DG
DG
DG
C734A
C735A
C734B
C735B
D705A
D706A
D706B
D705B
C740A
R715A
L701B
L701A
R720A
DG
C704B
C704A
C743A
C744A
C741A
C742A
C748A
C749A
C747A
C746A
C745A
C750A
C751A
*C707A
*C707B
*C738A
*C738B
*C739A
*C739B
IC700A
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
76
76
77
77
78
78
79
79
80
80
81
81
82
82
83
83
84
84
1
1
2
2
12
12
13
13
14
14
23
23
24
24
34
34
35
35
36
36
45
45
46
46
56
56
57
57
58
58
74
74
75
75
85
85
86
86
87
87
15
15
37
37
59
59
88
88
89
89
16
16
17
17
18
18
19
19
20
20
21
21
22
22
38
38
39
39
40
40
41
41
42
42
43
43
44
44
60
60
61
61
62
62
63
63
64
64
65
65
66
66
67
67
68
68
69
69
70
70
71
71
72
72
73
73
Q700B
1
3
24
Q700A
1
3
24
C703B
Q701B
Q701A
R701A
R702A
R701B
R702B
C701A
C702A
C701B
C702B
R705A
R705B
R706A
R706B
A
B
CH-B 2W VOX
CH-A 2W VOX
TDM-I/F
1)CLK_HW
2)FH_HW
3)UHW
4)DHW
2)FH_HW
3)UHW
4)DHW
Audio Codec
DSP
TDM I/F
C730A
C729A
R711A
R712A
R714A
R713A
C732A
R708A
R707A
R710A
R709A
D702A
C713A
R710B
R709B
R708B
R707B
D702B
D700A
D701A
D701B
D700B
+3.3V_SLIC
DG
R719A
DG
DG
C722A
CL700A
DG
CL701A
C725A
R716A
CL703B
CL704A
UHW1
CL703A
FH_HW1
CL702A
DHW1
+15V
R718A
DG
C711A
+15V
DG
DG
FG
DG
DG
DG
C718A
DG
DG
CL701B
DG
C716A
C717A
C720A
DG
C723A
DG
R703B
C719A
R700B
nINT_IN0
R700A
C700B
DOUT0
nRESET_OUT0
DG
R703A
DG
C712A
C700A
DG
DG
DG
SCLK0
DG
CS_SPI00
R717A
DIN0
C721A
DG
CL700B
+3.3V_SLIC
CL704B
+1.5V
DG
CL702B
DG
C733A
C715A
C714A
CLK_HW1
C705A
C705B
R704A
R704B
DG
*C708A
DG
*C736A
*C708B
*C736B
DG
C709A
C709B
C710B
C710A
*C706B
*C706A
D703B
D704B
D703A
D704A
FG
L700B
L700A
*C737B
DG
DG
*C737A
DG
DG
DG
DG
C734A
C735A
C734B
C735B
D705A
D706A
D706B
D705B
C740A
R715A
L701B
L701A
R720A
DG
C704B
C704A
C743A
C744A
C741A
C742A
C748A
C749A
C747A
C746A
C745A
C750A
C751A
*C707A
*C707B
*C738A
*C738B
*C739A
*C739B
IC700A
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
47
47
48
48
49
49
50
50
51
51
52
52
53
53
54
54
55
55
76
76
77
77
78
78
79
79
80
80
81
81
82
82
83
83
84
84
1
1
2
2
12
12
13
13
14
14
23
23
24
24
34
34
35
35
36
36
45
45
46
46
56
56
57
57
58
58
74
74
75
75
85
85
86
86
87
87
15
15
37
37
59
59
88
88
89
89
16
16
17
17
18
18
19
19
20
20
21
21
22
22
38
38
39
39
40
40
41
41
42
42
43
43
44
44
60
60
61
61
62
62
63
63
64
64
65
65
66
66
67
67
68
68
69
69
70
70
71
71
72
72
73
73
Q700B
1
3
24
Q700A
1
3
24
C703B
Q701B
Q701A
R701A
R702A
R701B
R702B
C701A
C702A
C701B
C702B
R705A
R705B
R706A
R706B
A
B
CH-B DTMF Signal
CH-A DTMF Signal
SPI Interface
Audio Codec
DSP
SPI I/F
18
KX-HT82480/82470/82460 Series
4.2.2.5.
Power Supply to Tip/Ring
Voltage and current generated by the SLIC is supplied to the phones.
Preset voltage is -26V (On-hook).
Current is set as 26mA (Off-hook).
Preset voltage is -26V (On-hook).
Current is set as 26mA (Off-hook).
4.2.2.6.
Hook Detection
The SLIC/CODEC provides a programmable off-hook detection mechanism.
The off-hook detection scheme provides two unique thresholds to allow hysteresis, and also includes a programmable debounce fil-
ter to eliminate false detection.
The off-hook detection scheme provides two unique thresholds to allow hysteresis, and also includes a programmable debounce fil-
ter to eliminate false detection.
4.2.2.7.
Ring Trip Feature
During ringing, the ring current is permanently sensed by the SLIC.
When the handset of a ringing telephone is picked up, the current is compared against the programmed ring trip threshold.
If it is above the programmed ring trip threshold, the ringing signal automatically stop and move to the off-hook status.
When the handset of a ringing telephone is picked up, the current is compared against the programmed ring trip threshold.
If it is above the programmed ring trip threshold, the ringing signal automatically stop and move to the off-hook status.
R714A
R713A
R710B
R709B
R708B
R707B
D702B
D700A
D701A
CL703B
+15V
FG
DG
DG
DG
DG
CL701B
R700A
R703A
C700A
DG
DG
DG
CL700B
CL704B
DG
CL702B
C705B
R704B
*C708B
*C736B
DG
C709B
C710B
*C706B
D703B
D704B
L700B
*C737B
DG
DG
DG
C734A
C735A
D705A
D706A
L701B
C704B
*C707B
*C738B
*C739B
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
23
23
24
24
34
34
21
21
22
22
Q700B
1
3
24
C703B
Q701B
R701A
R702A
C701A
C702A
R705B
R706B
A
0V
TIP
TIP
RING
-26V
-26V
R714A
R713A
R710B
R709B
R708B
R707B
D702B
D700A
D701A
CL703B
+15V
FG
DG
DG
DG
DG
CL701B
R700A
R703A
C700A
DG
DG
DG
CL700B
CL704B
DG
CL702B
C705B
R704B
*C708B
*C736B
DG
C709B
C710B
*C706B
D703B
D704B
L700B
*C737B
DG
DG
DG
C734A
C735A
D705A
D706A
L701B
C704B
*C707B
*C738B
*C739B
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
23
23
24
24
34
34
21
21
22
22
Q700B
1
3
24
C703B
Q701B
R701A
R702A
C701A
C702A
R705B
R706B
A
RING
On-hook
Off-hook
TIP
RING
R714A
R713A
R710B
R709B
R708B
R707B
D702B
D700A
D701A
CL703B
+15V
FG
DG
DG
DG
DG
CL701B
R700A
R703A
C700A
DG
DG
DG
CL700B
CL704B
DG
CL702B
C705B
R704B
*C708B
*C736B
DG
C709B
C710B
*C706B
D703B
D704B
L700B
*C737B
DG
DG
DG
C734A
C735A
D705A
D706A
L701B
C704B
*C707B
*C738B
*C739B
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
23
23
24
24
34
34
21
21
22
22
Q700B
1
3
24
C703B
Q701B
R701A
R702A
C701A
C702A
R705B
R706B
A
RING
On-hook
Off-hook
TIP
RING
19
KX-HT82480/82470/82460 Series
4.2.2.8.
Surge Protection
Thyristor is installed between T or R and FG protect from extraneous surge.
4.2.2.9.
Bell Signal Genarator and Transmission
In ringing mode, the ringing DC offset and the ringing signal are summed within SLIC/CODEC in accordance with the programmed
values.
The SLIC/CODEC supplies the line with 65 Vrms.
The bell signal is generated with VBAT supplied to the SLIC/CODEC.
values.
The SLIC/CODEC supplies the line with 65 Vrms.
The bell signal is generated with VBAT supplied to the SLIC/CODEC.
R714A
R713A
R710B
R709B
R708B
R707B
D702B
D700A
D701A
CL703B
+15V
FG
DG
DG
DG
DG
CL701B
R700A
R703A
C700A
DG
DG
DG
CL700B
CL704B
DG
CL702B
C705B
R704B
*C708B
*C736B
DG
C709B
C710B
*C706B
D703B
D704B
L700B
*C737B
DG
DG
DG
C734A
C735A
D705A
D706A
L701B
C704B
*C707B
*C738B
*C739B
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
23
23
24
24
34
34
21
21
22
22
Q700B
1
3
24
C703B
Q701B
R701A
R702A
C701A
C702A
R705B
R706B
A
VBAT
VBAT
R711A
R712A
R714A
R713A
R708A
R707A
R710A
R709A
D702A
R710B
R709B
R708B
R707B
D702B
D700A
D701A
D701B
D700B
CL700A
CL701A
CL703B
CL704A
CL703A
CL702A
+15V
+15V
DG
FG
DG
DG
DG
DG
DG
CL701B
DG
R703B
R700B
R700A
C700B
DG
R703A
DG
C700A
DG
DG
DG
DG
CL700B
CL704B
DG
CL702B
C705A
C705B
R704A
R704B
DG
*C708A
DG
*C736A
*C708B
*C736B
DG
C709A
C709B
C710B
C710A
*C706B
*C706A
D703B
D704B
D703A
D704A
FG
L700B
L700A
*C737B
DG
DG
*C737A
DG
DG
DG
DG
C734A
C735A
C734B
C735B
D705A
D706A
D706B
D705B
L701B
L701A
C704B
C704A
*C707A
*C707B
*C738A
*C738B
*C739A
*C739B
25
25
26
26
27
27
28
28
29
29
30
30
31
31
32
32
33
33
23
23
24
24
34
34
35
35
36
36
45
45
46
46
37
37
21
21
22
22
38
38
39
39
40
40
41
41
42
42
43
43
44
44
Q700B
1
3
24
Q700A
1
3
24
C703B
Q701B
Q701A
R701A
R702A
R701B
R702B
C701A
C702A
C701B
C702B
R705A
R705B
R706A
R706B
A
B
20
KX-HT82480/82470/82460 Series
4.2.2.10. EXT-CID Transmission
The SLIC/CODEC generates the extension Caller ID signals (FSK signal) with the CPU board control.
The data flow is shown below.
The data flow is shown below.
1. The CPU board control signals are received.
2. PLD controls the tone generator inside SLIC/CODEC.
3. The SLIC/CODEC generates Caller ID signals (FSK).
4. Caller ID signals are sent to extension ports.
2. PLD controls the tone generator inside SLIC/CODEC.
3. The SLIC/CODEC generates Caller ID signals (FSK).
4. Caller ID signals are sent to extension ports.
4.2.2.11. Power Supply Voltage Generator
The input from the main power supply is in 3 voltage levels: +3.3V, +15V and +1.5V.
Each required voltage levels are generated on board DC-DC converter or LDO devices.
Power supply block diagram is described as below figure.
Each required voltage levels are generated on board DC-DC converter or LDO devices.
Power supply block diagram is described as below figure.
PLD
SLIC/CODEC
CPU Interface
FSK Signal (Analog Signal)
TONE FSK
TONE1
TONE2
TONE=OFF
DCDC
SLIC/CODEC
SLIC/CODEC
Vbat
Control
SLT Power Supply
Bell Signal
MW
Bell Signal
MW
+3.3V
+15V Input
+3.3V Input
+1.5V
+1.5V Input
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