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• Instantaneous power interruption operation

When instantaneous power interruption is 300msec or less, reset operation is not carried out because the voltage is retained by
the capacitor in the power supply.
After HALT from MPR is detected at the DC power down port, CPU goes into the sleep mode by executing the instruction of
SLEEP.
At the sleep mode, the CPU/Clock enters the halt state while the contents of the register, the internal RAM, and the I/O port  are
maintained.
When the instantaneous power interruption is released, HALT is negated, and CPU is recovered to the normal mode by the
detection of IRQ0=L

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• 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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• CODEC interface

Can connect up to four Infineon-manufactured PEB2466, and is intended for enabling the line control.

• GPIO interface

Parallel interface that is arbitrarily programmable bidirectionally.

Infineon PEB2466 CODEC is installed. The analogue features such as BN, frequency characteristic, volume level, sidetone are
configured by ASIC CODEC interface DCLK, CS, DOUT, DIN. In addition, the CODEC has an internal I/O port that supports Hook
detection, DTMF detection, BELL relay control and DIAG relay control. Also, it converts A/D to D/A, and 4-line-analogue signal to
PCM code in G.711 format. 

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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 HIC and a balanced network 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. 

Each port has its own DTMF receiver. The receiver detects the signal using IC1 for port A through D, IC2 for port E through H, IC4
for port I through L and IC6 for port M through P. The CODEC detects the DTMF data to be effective at EST terminal=H. This infor-
mation is detected in the MPR via SAMSON, then DTMF signal is detected by MPR reading the DTMF receiver data that came
through the SAMSON local bus.