Panasonic KX-TDA1178X (serv.man5) Service Manual ▷ View online
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KX-TDA1178X
5.2.2.
IC3 (ASIC)
• EC bus interface
Independent bus for 16bit/8MHz two-way address data multiplex.
• CT bus interface
Supports eight 8.192MHz highways (128 time slots).
• Local TSW
Exchanges the time slots between CT bus (1024ch) and local highway (64ch).
• Local highway interface
Accommodates 2.048, 4.096, and 8.192MHz highways (Up to 64 time slots).
• Local gain control
Controls the gain of the local highway up-and-down 64ch in 1db step arbitrarily.
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KX-TDA1178X
• CODEC interface
Can connect up to 12 Infineon-manufactured PEB3265, and is intended for enabling the line control.
• GPIO interface
Parallel interface that is arbitrarily programmable bidirectionally.
5.2.3.
CODEC Function (IC201A-X)
Infineon PEB3265 CODEC is installed. The analogue features such as BN, frequency characteristic, volume level, sidetone are
configured by FPGA CODEC interface DCLK, CS, DOUT, DIN. Also, it converts A/D to D/A, and 4-line-analogue signal to PCM
code in G.711 format.
configured by FPGA CODEC interface DCLK, CS, DOUT, DIN. Also, it converts A/D to D/A, and 4-line-analogue signal to PCM
code in G.711 format.
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KX-TDA1178X
5.2.4.
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.
5.2.5.
DTMF Signal Detection
Each port has its own DTMF receiver in the codec.
Detection of DTMF signal by Codec transmits this data to the MPR via the FPGA.
Via the FPGA, MPR reads the DTMF signal which is received in the Codec.
Detection of DTMF signal by Codec transmits this data to the MPR via the FPGA.
Via the FPGA, MPR reads the DTMF signal which is received in the Codec.
5.2.6.
Power Supply
Voltage and current generated by the SLIC is supplied to the phones.
Preset voltage is -26V.
Current is set as 26mA.
Preset voltage is -26V.
Current is set as 26mA.
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KX-TDA1178X
5.2.7.
Hook Detection
The off-hook status is detected when the telephone is off-hook. When a telephone is off-hook, change in current is detected in SLIC,
and this information is transmitted to the ITA/B pin of SLIC (27, 36pin) as OFF-HOOK=L/ON HOOK=H signal. This digital signal is
received by CODEC IC and recognized as off-hook signal. The off-hook status is analyzed by software.
and this information is transmitted to the ITA/B pin of SLIC (27, 36pin) as OFF-HOOK=L/ON HOOK=H signal. This digital signal is
received by CODEC IC and recognized as off-hook signal. The off-hook status is analyzed by software.
5.2.8.
Ring Trip Feature
During ringing, the ring current is permanently sensed by the SLIC(IC200A-X). Signal of the ring current is supplied to the
CODEC(IC201A-X) by means of the ITA/B signal.This current signal is continuously sampled by the CODEC.
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 is automatically removed from the Tip-Ring interface during zero cross-
ing.
CODEC(IC201A-X) by means of the ITA/B signal.This current signal is continuously sampled by the CODEC.
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 is automatically removed from the Tip-Ring interface during zero cross-
ing.
5.2.9.
Surge Protection
Thyristor is installed between T or R and FG protect from extraneous surge.
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