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6

• LED Operation status indicating LED (Two colors)

OFF: Fault
Red ON: Fault (RESET included)
Green ON: Normal (Line not in use)
Green Flash (60/minute): Normal (Line in use)
Orange: OUS (Because OUS needs to be controlled by MPR, reset terminal and port control terminal are Red Blinking: OUS to
generate OUS)

• 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

7

• 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.

8

• CODEC interface

Can connect up to 12 Silicon Labs Si32261, and is intended for enabling the line control.

• GPIO interface

Parallel interface that is arbitrarily programmable bidirectionally.

Silicon Labs Si32261 CODEC is installed. The analogue features such as BN, frequency characteristic, volume level, sidetone are
configured by PLD 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. 

9

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. 

Each port has its own DTMF receiver in the codec. 
Detection of DTMF signal by Codec transmits this data to the MPR via the PLD.
Via the PLD, MPR reads the DTMF signal which is received in the Codec.

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).

TA

RA

DG

CLK

FH

UHW

DHW

nC_CS0

DIN[0]

DCLK[0]

DOUT[0]

+3.3V

+3.3V

C316A

DG

C300A

C313A

C317A

DG

CN201

2

DIAG_T

RL201A

6

7

5

CN201

3

DIAG_R

RL201A

3

2

4

C313B

DG

C302A

C303A

C302B

C303B

C318A

R300A

R320A

VBATa

J300A

DG

DG

+40V

R310A

J301A

R308A

R309A

R308B

R309B

D305A

C304A

DG

D304A

FG

C305A

C321A

C310A

R315A

R316A

C309A

L300A

DG

DG

R314A

D301A

1

2

C308A

L301A

+40V

DG

Q300A

S

1 2 3

G

4

D

5 6 7 8

J699

Q301A

S

D

G

CN200

26

1

C307A

IC300A

TIPa

1

N/C2 2

SRINGDCa

5

SRINGACa

6

STIPACa

7

STIPDCa

8

SVBATa

11

SVDC 12

FSYNC 15

SDITHRU 16

PCLK 17

DTX 18

DRX 19

SDCHa

20

SDCLa

21

DCDRVa

22

DCFFa

23

DCFFb

24

VDDD 28

VDDREG

29

CSB 30

SCLK 31

SDO 32

SDI 33

STIPDCb

38

STIPACb

39

SRINGACb

40

SRINGDCb

41

VDDA 44

N/C49 49

N/C56 56

RINGa

59

R321A

R319A

R318A

R313A

R306A

R306B

R307A

R307B

RL200A

9

10

8

RL200A

4

3

5

R317A

R260A

R261A

A

To ASIC

To PLD

m

b

m

b

b

m

m

b

SDCL

SDCH

DCDRV

2W-VOX

Audio codec

DSP

PCM I/F

SPI I/F

TA

RA

DG

CLK

FH

UHW

DHW

nC_CS0

DIN[0]

DCLK[0]

DOUT[0]

+3.3V

+3.3V

C316A

DG

C300A

C313A

C317A

DG

CN201

2

DIAG_T

RL201A

NC

6

7

5

CN201

3

DIAG_R

RL201A

3

2

4

C313B

DG

C302A

C303A

C302B

C303B

C318A

R300A

R320A

VBATa

J300A

DG

DG

+40V

R310A

J301A

R308A

R309A

R308B

R309B

D305A

C304A

DG

D304A

FG

C305A

C321A

C310A

R315A

R316A

C309A

L300A

DG

DG

R314A

D301A

1

2

C308A

L301A

+40V

DG

Q300A

S

1 2 3

G

4

D

5 6 7 8

J699

Q301A

S

D

G

CN200

26

1

C307A

IC300A

TIPa

1

N/C2 2

SRINGDCa

5

SRINGACa

6

STIPACa

7

STIPDCa

8

SVBATa

11

SVDC 12

FSYNC 15

SDITHRU 16

PCLK 17

DTX 18

DRX 19

SDCHa

20

SDCLa

21

DCDRVa

22

DCFFa

23

DCFFb

24

VDDD 28

VDDREG

29

CSB 30

SCLK 31

SDO 32

SDI 33

STIPDCb

38

STIPACb

39

SRINGACb

40

SRINGDCb

41

VDDA 44

N/C49 49

N/C56 56

RINGa

59

R321A

R319A

R318A

R313A

R306A

R306B

R307A

R307B

RL200A

9

10

8

RL200A

4

3

5

R317A

R260A

R261A

A

To ASIC

To PLD

m

b

m

b

b

m

m

b

SDCL

SDCH

DCDRV

DTMF signal

Audio codec

DSP

PCM I/F

SPI I/F

TA

RA

C313A

CN201

2

DIAG_T

RL201A

6

7

5

CN201

3

DIAG_R

RL201A

3

2

4

C313B

DG

C302A

C303A

C302B

C303B

VBATa

J300A

DG

DG

R310A

R308A

R309A

R308B

R309B

D305A

C304A

DG

D304A

FG

C305A

C321A

C310A

R315A

R316A

C309A

L300A

DG

DG

R314A

D301A

1

2

C308A

L301A

+40V

DG

Q300A

S

1 2 3

G

4

D

5 6 7 8

Q301A

S

D

G

CN200

26

1

C307A

IC300A

TIPa

1

SRINGDCa

5

SRINGACa

6

STIPACa

7

STIPDCa

8

SVBATa

11

SDCHa

20

SDCLa

21

DCDRVa

22

DCFFa

23

DCFFb

24

STIPDCb

38

STIPACb

39

SRINGACb

40

SRINGDCb

41

RINGa

59

R319A

R318A

R313A

R306A

R306B

R307A

R307B

RL200A

9

10

8

RL200A

4

3

5

R317A

R260A

R261A

m

b

m

b

b

m

m

b

SDCL

SDCH

DCDRV

TIP

RING

0

-26V