Panasonic KX-TDA6178X / KX-TDA6178XJ Service Manual ▷ View online
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KX-TDA6178X/KX-TDA6178XJ
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.
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KX-TDA6178X/KX-TDA6178XJ
5.2.6.
Power Supply
Voltage and current generated by the SLIC is supplied to the phones.
Preset voltage is -26V, but is switched over to -45V for ports 1-8, depending on circuit distance.
Current is set as 26mA.
Preset voltage is -26V, but is switched over to -45V for ports 1-8, depending on circuit distance.
Current is set as 26mA.
5.2.7.
Dial Pulse Detection
When a telephone initiates pulse dialing, this feature detects the pulse-dialing signal.
When the telephone initiates dialing, changes in voltage is detected in SLIC, and this information is transmitted to the ITA/ITB pin of
SLIC (27, 36pin) as Make=L/Break=H signal. This digital signal is received by CODEC IC and recognized as dialing signal. Both
10pps and 20pps can be received. The dialing speed is analyzed by software.
When the telephone initiates dialing, changes in voltage is detected in SLIC, and this information is transmitted to the ITA/ITB pin of
SLIC (27, 36pin) as Make=L/Break=H signal. This digital signal is received by CODEC IC and recognized as dialing signal. Both
10pps and 20pps can be received. The dialing speed is analyzed by software.
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KX-TDA6178X/KX-TDA6178XJ
5.2.8.
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.
5.2.9.
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.
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KX-TDA6178X/KX-TDA6178XJ
5.2.10. Surge Protection
Thyristor is installed between T or R and FG protect from extraneous surge.
5.2.11. Self-Diagnosis
A self-diagnosis relay (RL201A) is installed in A port. In the normal operation mode, it breaks the self-diagnosis relay, and in the
self-diagnosis mode, it makes the self-diagnosis relay. In the self-diagnostic mode, A Tip-Ring is connected to the paired Tip-Ring of
the outside-line card via backboard, and self-diagnosis is feasible.
The self-diagnosis of the outside-line card includes outside call pick up, dial pulse transmission, DTMF transmission, BELL recep-
tion and CPC detection.
self-diagnosis mode, it makes the self-diagnosis relay. In the self-diagnostic mode, A Tip-Ring is connected to the paired Tip-Ring of
the outside-line card via backboard, and self-diagnosis is feasible.
The self-diagnosis of the outside-line card includes outside call pick up, dial pulse transmission, DTMF transmission, BELL recep-
tion and CPC detection.
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