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LED Lamp (BATT ALARM): Turns on to indicate the dropping of the lithium battery voltage (less than 2.8V).
LED Lamp (SD ACCESS): Turns on when the SD card is accessing.
SD card slot: Mounts the system program SD card.
Reset Switch: Press at the system reset. 
System Initialize Switch: On default startup, set the switch to the "SYSTEM INITIALIZE" position for the power ON. Return the
switch to the "NORMAL" position when the main power switch starts to flash. On normal startup, turn the power ON with the
"NORMAL" position.
LAN connector: 1, 2. Used for the PC programming and the VoIP.
PAGING: External PAGING output. Connect to the device with the built-in amplifier.
MOH: External music on-hold input.
LED Lamp (LINK / ACT) Turns on: LINK OK. Blinking: ACTive data is communicated.
LED Lamp (100 / 10) Turns on: 100BASE-TX. Turns off: 10BASE-T.

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• CPU2 block (BLOCK1) 

This block operates the main unit control. Besides this operates various controls, select signal generation, DMA control and
serial port control. This contains the built-in clock function.
Configuration: IC101 (CPU), IC102 (clock buffer for PCI), and so on.
Function:
(IC101) Generates the select signal in accordance with the memory map and operates Readout/Storage of data between each
peripheral.
Controls the DMA transfer between built-in serial controller and memory.
Operates input/output control of each I/O signal in accordance with the program.

• CPU_POWER block (BLOCK2)

This block is a power supply part of CPU.
Configuration: IC101 (CPU), X501 (33.33MHz clock for CPU), and so on.
Function:
Power pins of CPU.(+3.3VD,+2.5VD,+1.25VD)
Clock oscillation circuit for CPU operation.

• MEMORY2 block (BLOCK3)

This is a work area and the main unit control program storage or the system boot program storage area.
Configuration: IC602 (Flash ROM), IC601, IC603 (DDR-SDRAM), CN601 (IPCMEC card connector) and so on.
Function:
(IC602) Saves (some of) the system boot program and the system data.
(IC601, IC603) The main program is loaded from the SD card on the system start-up.
Used as the program area and the CPU work area after start-up.
It is independent bus connection to CPU due to high-speed action (bus clock 166MHz).

• FPGA + RTC + ESVM block (BLOCK 4)

The FPGA is a CPU Peripheral function IC.
Configuration: IC801 (FPGA), IC802 (RTC, 32.768kHz clock for CPU), IC804 (ESVM DSP), IC805 (ESVM voice data FLASH)
and so on.
Function:
(IC801) has the functions of RTC I/F, LAN SW I/F(SPI I/F), reset control port, LED driver and address decoder and so on.
(IC802)This is working in the Real time clock function when system stops.
This IC is maintained by the onboard battery back-up.
(IC804,IC805) These are the simple voice mail function.

• LAN block (BLOCK 5)

It is LAN controller connected with PCI.
Configuration: IC1002 (MAC+PHY (LAN controller)), X1001 (25MHz clock for LAN controller) and so on.
Function:
(IC1002) This is a function to communicate LAN through LAN SW.

• LAN_SW_5P block (BLOCK 6)

5ports LAN SW and the external I/F LAN connector. 
Configuration: IC1101 (LAN SW), JK1102, JK1103 (LAN connector) and so on.
Function:
(IC1101) It is a hub that does LAN signal of two internal ports and two external ports in the switching.
(JK1102, JK1103) These are connectors with built-in LAN transformer and LED.

• SD and RS232 block (BLOCK 7)

SD card I/F and RS232 (serial) I/F
Configuration: IC1201 (SD card controller), CN1201 (SD card connector), IC1202 (RS232 D/R)and so on.
Function:
(IC1201) This provides the SD card I/F function and loads the main unit program and the system data from the SD card storing
the main unit control program.
(IC1202). This provides the serial I/F driver / receiver function.

15

• NEXUS (+ SRAM) block (BLOCK 8)

This provides the communication function between each option card, call control (TSW function), conference call, tone genera-
tion and gain control function.
Configuration: IC1303(ASIC(NEXUS)), IC1302, X1301,IC1301(SRAM), CN1301(RMT card connector) and so on.
Function:
(IC1303) This functions as the bus master of EC bus (synchronous bus with 16 bit width, transmission rate max.10Mbps).
Communicates with ASIC mounted to each option card via EC bus and controls the option card.
Controls CT bus (HW clock 8.192MHz, 8 highway, 128 timeslot) for TSW function.
Controls the conference call for 3 people x -8 parties-8 people x-3 parties.
Generates single and DTMF tone in any highway and timeslot.
Provides the digital gain control function by data conversion.Provides some I/O ports for CODEC channel pulse generation,
modem encoding rule setting and music on-hold switching and is controlled by CPU.
(IC1301) Saves the user configuration data (such as key assign data per PT).
The memory is maintained by the onboard battery back-up.

• MOH/PAGING block (BLOCK 9)

This provides the external music on-hold input x 1, the external paging output x 1 port. And also this provides the external music
on-hold input 1 system and exclusively the internal music on-hold output.
Configuration:
IC1502 (CODEC), IC1504 (OP Amp), IC1505 (Melody IC), Q1501, Q1503, Q1505 (transistor), JK1502, JK1503 (pin jack) and so
on.
Function:
Likewise, the external music on hold is input from JK1502 and is made A/D conversion in IC1502 via AGC (Auto Gain Control)
circuit, which consists of IC1504, Q1503, Q1505 and other CR, this is then connected to the call line HW. The external music on-
hold and IC1505 is exclusively connected to IC1502 input (by software control).
The various tones & DTMF tone and the voice data generated in IC1303 (ASIC(NEXUS)) are made D/A conversion in IC1502.
They are output via JK1503 respectively.

• EC_CT CON block (BLOCK 10)

This is the connector that connects IPCMPR and Back Board.
Configuration: CN1601 (Back Board connector) and so on.
Function:
(CN1601) Connection of EC bus, CT bus, and control signals for the option card.

• VOIP_PCI_CON block (BLOCK 11)

This is the connector for 16 VOIP DSP/ 64 VOIP DSP card.
Configuration: CN1701 (Original PCI connector) and so on.
Function:
(CN1601) Connection of PCI bus and LAN data for 16 VOIP DSP/ 64 VOIP DSP card.

• debug_PCI_CON block (BLOCK 12)

This is the connector for debug. (Not mounted connector)
Configuration: CN1801 (Original PCI connector) and so on.
Function:
Nothing

16

• POWER block (BLOCK 13)

This consists of DC/DC converter circuit and various regulators.
Configuration:
IC1901 (3.3V, 2.5V DC/DC converter), IC1902 (1.25 DC/DC converter), IC1908 (1.8V regulator), IC1907 (1.2V regulator),
IC1903 (Comparator), Q1901, Q1902, Q1903 (FET, transistor), B1901, IP1901 (circuit protection device) and so on.
Function:
+15V_CON input is stepped down to +3.3VD and +2.5VD by DC/DC converter circuit which consists of IC1901, Q1901 and
Q1902 and is supplied to each IC power. 
Q1901 and Q1902 and is supplied to each IC power. 
+3.3VD is generated by the DC/DC converter is converted to +1.25VD and supplied to IC101 core power.
+2.5VD is generated by the DC/DC converter is converted to +1.8VD and supplied to IC1101 core power.
+2.5VD is generated by the DC/DC converter is converted to +1.2VD and supplied to IC801 core power.
BAT1901, which is a lithium battery for backup, is connected to the power supply of IC1301 (SRAM) and IC802 (RTC) via D1904,
D1905.
IC1903 compares B1901 output voltage to the reference voltage (about +2.7V) and drives LED (BATT ALARM) that indicates
dropping of backup voltage.

• TDA600_CON block (BLOCK 14)

This provides the control interface between IPCEMPR Card and BUS-M Card. (Not mounted connector and so on)
Configuration: CN2001 (Connector for BUS-M),IC2001-IC2001(buffer) and so on.
Function:
Nothing

• ESVM_VOX block (BLOCK 15)

It is VOX detection circuit.
Configuration: IC2201, IC2202 (CODEC), IC2203, IC2204 (OP Amp), IC2205, IC2206 (Comparator) and so on.
Function:
The ESVM voice data are made D/A conversion in IC2201, IC2202 and IC804 (ESVM DSP). After these are amplified with the
amplifier, the sound is detected with the comparator.