Panasonic KX-NCP1000GR, Service Manual, Page: 16 / 159

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KX-NCP500GR
• 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