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• 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 2, the external paging output x 2 port. And also this provides the external music
on-hold input 1 system and exclusively the internal music on-hold output.
Configuration:
IC1501, IC1502 (CODEC), IC1503, IC1504 (OP Amp), IC1505 (Melody IC), Q1501~Q1505 (transistor), JK1501~JK1504 (pin
jack) and so on.
Function:
The external music on-hold 1 is input from JK1502 and is A/D converted in IC1501 via AGC (Auto Gain Control) circuit, which
consists of IC1503, Q1502, Q1504 and other CR, this is then connected to the call line HW.
Likewise, the external music on hold 2 is input from JK1504 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 2 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 IC1501
and IC1502. They are output via JK1501, JK1503 respectively.

• EC_CT CON block (BLOCK 10)

This is the connector that connects IPCEMPR 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

14

• 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.
Configuration: CN2001 (Connector for BUS-M ),IC2001-IC2001(buffer) and so on.
Function:
Control interface between IPCEMPR Card and BUS-M Card.

• SVM_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 SVM voice data are made D/A conversion in IC2201, IC2202 amd IC804 (SVM DSP). After these are amplified with the
amplifier, the sound is detected with the comparator.

15

The back board (BB) connects signals between all cards in KX-TDE600. It also supplies power from the power supply unit to the
cards.
CONNECTORS EXPLANATION
(1) Power Supply Unit Connector: CN100
(2) Free Slot Connectors: CN101-CN110
(3) IPCEMPR Card Slot Connector: CN111
(4) BUS-M Card Connector: CN112
(5) RS-232C Connector: CN113
CN113 is connected to the connector in front of the product.
(6) LED Connector: CN114
CN114 is connected to the Board on the product.
(7) FAN Connector: CN115
(8) BUS Connector: CN301, CN302
(9) Voltage drop Resistor for Fan Control: R400

16

The control system of this unit is composed of the main control section (IPCEMPR) controlling the entire system, exchanging
voice data, the circuit control section (LPR) controlling various telephone lines and the power supply section (POWER).
IPCEMPR, LPR and POWER are connected each other through the System BUS (ADDRESS BUS, DATA BUS and CONTROL
BUS). IPCEMPR LPR are under I/O control (I/O Read/Write) by MPR.
MPR controls LPR which has a microprocessor by the lnter-Microprocessor Communication System supported by ASIC. That
is, IPCEMPR and LPR exchange controlling messages through bi-directional buffer and CPU controls LPR so that it can man-
age multiple telephone lines.
I/O address for LPR access is fixed per each free slot. CPU discriminates the sort of LPR through the inter-processor communi-
cation system.
POWER detects the voltage drop of the AC input and the DC output and transfers it to IPCEMPR.

This card is the main control section of this unit. It controls all the cards mounted on the free slots, and communication of RS-
232C ports.
The front of the IPCEMPR card is equipped with two LEDs (LED1 and LED2) that indicate the operating status of this card,
There are no rotary switches on IPCEMPR and a push switch used to execute the system reset.
This control circuit execute the control signals for the exchange process, and this card is composed of the following
(A) 32bit CPU (32bit data bus)
(B) DDR_SDRAMs, SRAM
(C) Flash memory
(D) Lithium Battery for back-up of clock IC and Static RAM

BB (back board) is the mother board of the basic shelf. This board connects each card (POWER, IPCEMPR, and optional cards)
together. This board has one RS-232C connector.

This unit is switching regulator power supply and supplies DC voltages to IPCEMPR card, optional card (free slot).