KX-NCP1170XJ (serv.man2) - Panasonic PBX Service Manual (repair manual). Page 5

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This card, which is used in the free slot of the NCP system, can randomly connect four of SLT, DPT, and APT. 
In DPT connection, the XDP function allows SLT to be connected to each port in parallel.

Functional Block

Functional contents

Extension Interface

Number of Ports

4 ports

PT Interface

+40V/+15V Over current protective function, Voltage switching function Inter-
APT communications
D (Upward: 0.25kbps, Downward: 0.69kbps)
2W Ping-pong transmission system (31.25kbps)
Inter-DPT communications, Inter-CS (TDA0141) communications (from ver.1.1)
2B+D (144kbps) 2W Ping-pong transmission system (512kbps)
Dch-control HDLC embeds eight channels in ASIC
Surge protective function

SLT Interface

+30V 30mA Feeding function
Dial-pulse signal detecting function
DTMF signal detecting function
Bell signal issuing function
Hook detecting function
Ring trip detecting function
2W/4W converting function
Surge protective function
Infineon-manufactured 4ch codec function
CODEC function
µ/A Iaw switching function
Test function (Loop back, Tone generation)
Programmable digital filtering function
Serial interface function
PIO function

DTMF Receiver

4 lines for each port

Extension Caller ID

Supported standard 

ITU-TV.23 (1200bps) FSK
BELL202 (1200bps) FSK

On-board Ringer

20/25Hz 75Vrms
Phase control (Three-phase / Four-phase)

On-board DC/DC Power Supply

Input +15V
Output +15V, +5V, +3.3V

Power Failure Forwarding Function

1 lines supported

ASIC

EC bus interface function
CT bus interface function, Digital PLL function
Local bus interface function
Time switch function, Gain controlling function, DPRAM function
Private telephone controlling interface function
Parallel IO function

SRAM

128kbyte

LED Display Circuit

Card status indicating LED: Two colors (Red/Green)

External Interface Connector

Extension interface

RJ45: 4port

Power failure forwarding RJ45: 1port