Panasonic KX-TES824CA / KX-TEM824CA / KX-TE82461X / KX-TE82474X / KX-TE82480X / KX-TE82483X / KX-TE82491X / KX-TE82492X / KX-TE82493X / KX-A227X Service Manual ▷ View online
25
KX-TES824CA/KX-TEM824CA
4.15. DTMF Generator Circuit
4.15.1. Composition
DTMF generator is controlled by the 8 bit I/O data of CO G/A. DTMF tone is sent to CO line.
DTMF GENERATOR
R1
R2
R3
R4
C1
C2
C3
C4
TRANSMIT SIGNAL
L
L
L
L
L
L
L
L
DISABLE
H
L
L
L
H
L
L
L
1
H
L
L
L
L
H
L
L
2
H
L
L
L
L
L
H
L
3
L
H
L
L
H
L
L
L
4
L
H
L
L
L
H
L
L
5
L
H
L
L
L
L
H
L
6
L
L
H
L
H
L
L
L
7
L
L
H
L
L
H
L
L
8
L
L
H
L
L
L
H
L
9
L
L
L
H
L
H
L
L
0
L
L
L
H
H
L
L
L
*
L
L
L
H
L
L
H
L
#
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KX-TES824CA/KX-TEM824CA
4.16. DTMF Receiver Circuit
4.16.1. Composition
The DTMF receiver circuit is composes of four DTMF receivers.
IC613 and IC614 are used for the DTMF receivers from SLT connected to the extension.
The DTMF signal is the 4bit parallel data and read by ASIC.
*In case of KX-TEM824, the system have two more DTMF receiver which are in KX-TE82483.
IC613 and IC614 are used for the DTMF receivers from SLT connected to the extension.
The DTMF signal is the 4bit parallel data and read by ASIC.
*In case of KX-TEM824, the system have two more DTMF receiver which are in KX-TE82483.
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KX-TES824CA/KX-TEM824CA
4.17. INT CALL ID Interface Circuit
By using the DSP built into the ASIC, it is possible to produce CALLID signal and send it through the cross point to each extension.
The CALL ID signal can be switched between FSK and DTMF. There are three sources of the extension CALL ID in the system.
The CALL ID signal can be switched between FSK and DTMF. There are three sources of the extension CALL ID in the system.
4.18. MODEM Interface Circuit
The ASIC incorporates a modem function. There is no specified line and modem communication from any line is possible. The
modem communication speed is 2400bps and the system programming rewrite can be operated at the equivalent of 9600bps at
maximum by using software compression technology.
modem communication speed is 2400bps and the system programming rewrite can be operated at the equivalent of 9600bps at
maximum by using software compression technology.
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KX-TES824CA/KX-TEM824CA
4.19. USB Interface Circuit
This unit have one USB port for using PC programming. ASIC have USB 1.1 controller inside, so this unit make up USB interface
only ASIC and USB connector.
only ASIC and USB connector.
4.20. OGM Interface Circuit
The TES/TEM824 model incorporates the functions of OGM, CNG and DTMF detection. At the OGM recording, it changes the ana-
log sound in the DSP of the ASIC into a digital signal of 16bits by A/D conversion. Then, the data is compressed (encoded) and
stored in a 4M serial flash. Conversely, when being recovered the data stored in the 4M serial flash are decompressed to 16-bit dig-
ital data, and then reproduced as an analog sound after the D/A conversion. The recording/reproducing is achieved by connecting
the path from external line through the cross point to the ASIC.The waveform coding method used at the recording/reproducing
stage is the LD-ADPCM method. The DSP compresses the sound and stores the 4M serial flash using the memory management
software in the DSP. The unit has the recording/reproducing function of 1CH as an initial mounting.The recording time of the OGM
is three minutes at maximum.
Also, the CNG and DTMF detection are the functions operated in conjunction with the OGM and realized by the DSP in the ASIC.
log sound in the DSP of the ASIC into a digital signal of 16bits by A/D conversion. Then, the data is compressed (encoded) and
stored in a 4M serial flash. Conversely, when being recovered the data stored in the 4M serial flash are decompressed to 16-bit dig-
ital data, and then reproduced as an analog sound after the D/A conversion. The recording/reproducing is achieved by connecting
the path from external line through the cross point to the ASIC.The waveform coding method used at the recording/reproducing
stage is the LD-ADPCM method. The DSP compresses the sound and stores the 4M serial flash using the memory management
software in the DSP. The unit has the recording/reproducing function of 1CH as an initial mounting.The recording time of the OGM
is three minutes at maximum.
Also, the CNG and DTMF detection are the functions operated in conjunction with the OGM and realized by the DSP in the ASIC.
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