KX-NS5110X, KX-NS5111X, KX-NS5112X - Panasonic PBX Service Manual (repair manual). Page 7

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CN101 (Connector 80pin)

• Connection with the main board.

IC103 (Buffer)

• Card ID generation

IC101 (DSP #0)

• VoIP Function
• Supported Voice Codec Standards : G.711, G.729A.
• Echo Cancellation.
• RTP/RTCP.
• Fax Tones Detection and Generation.
• DTMF Detection and Generation. 
• The legacy voice data is connected with main board with the TDM bus, and the VoIP data is connected with main board with LAN

I/F.

IC102 (DDR SDRAM #0 64MByte)

• 64MByte main memory for DSP #0

IC202 (PHY 100BASE-TX)

• LAN-I/F for connection with main board.

X201(25MHz Clock)

• Clock for DSP and LAN.

IC201 (Buffer)

• Buffer for 25MHz Clock.

IC303 (DC/DC converter)

• +3.3VD is made from +15V.

IC302 (DC/DC converter)

• +1.05VD_DSP0 is made from +3.3VD.

IC301 (Series regulator)

• +2.5VD_DSP0 is made from +3.3VD.

It is only NS5112 as follows.
IC501 (DSP #1)

• VoIP Function
• Supported Voice Codec Standards : G.711, G.729A.
• Echo Cancellation.
• RTP/RTCP.
• Fax Tones Detection and Generation.
• DTMF Detection and Generation.
• DSP#1 is connected with main board by LAN through DSP#0.

IC502 (DDR SDRAM #1 64MByte) 

• 64MByte main memory for DSP #1

IC702 (DC/DC converter)

• +1.05VD_DSP1 is made from +3.3VD.

IC701 (Series regulator)

• +2.5VD_DSP1 is made from +3.3VD.