KX-NS5173XSX, KX-NS5174XSX - Panasonic PBX Service Manual (repair manual). Page 5

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This card is plugged into a free slot on NS300/500/320/520 systems and randomly connects up to 
8 (KX-NS5173) or 16 (KX-NS5174) SLT devices.
This card doesn't have CPU device, and every Monitoring and/or Controlling functions are realized by CPU board.
Also, this card has capability to send Caller ID signal to extension ports.

Functional Block

Functional contents

Extension Interface

Number of Ports

8 Port/NS5173, 16 Port/NS5174

SLT Interface

-26V / 26mA 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
/A Iaw switching function
Test function (Loop back, Tone generation)
Programmable digital filtering function
Serial interface function
PIO function

DTMF Receiver

8 Lines for each port/NS5173, 16 Lines for each port/NS5174

Extension Caller ID

Supported standard 

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

On-board Ringer

20/25Hz 65Vrms
Phase control (Three-phase / Four-phase)

ASIC

Local bus interface function
Time switch function, Gain controlling function, DPRAM function
Private telephone controlling interface function
Parallel IO function

External Interface Connector

Extension interface

RJ45: 4port