KX-NS8290CE - Panasonic PBX Service Manual (repair manual). Page 49

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7 PRI-TX at PRI23 Mode

Description: PRI23 Interface Tx Signal
Ch1: TP(PRI_TX+)-TP(PRI_TX-)
Remark: This Signal can be measured when KX-NS8290X line interface is
               Link up with DSU. Please check [LINE] LED.

8 FCS

Description: Framer LSI(IC700) frame sync signal
Ch1: TP(FCS)-DG
Remark: FCS Signal is 8kHz interval frame sync signal.

9 CLK2

Description: Framer LSI(IC700) 2.048MHz system clock
Ch1: TP(CLK2)-DG

10 RCLK

Description: Framer LSI(IC700) 2.048MHz receiver circuit system clock
Ch1: TP(RCLK)-DG

UEXP_CLK

Description: CPU internal bus cycle clock (34.375MHz)
Ch1: TP(UEXP_CLK)-DG
Remark: When CPU (IC100) is operating, this clock can be 
               monitored at TP(UEXP_CLK).

UEXP_CS0

Description: Framer LSI (IC700) Chip Select Signal
Ch1: TP(UEXP_CS0)-DG
Remark: This signal can be monitored when software boot-up is completed.
               When software is operating correctly, CPU is monitoring the Framer LSI.

11

12

1.544MHz  

6.16V 

488ns 

(2.048MHz)

3.3V 

2.048MHz  

3.3V 

2.048MHz  

3.3V 

34.375MHz  

3.3V 

3.3V