NEC ND-70919 system manual Plo

CHAPTER 1 GENERAL INFORMATION

System Outline

PLO

The Phase Locked Oscillator (PLO) equipped on the MP card synchronizes the system to an ISDN clock.

The PLO generates the clock signals according to the source clocks received from network. The source clock signals are extracted at DTI/BRT/PRT cards and supplied to the PLO. Two clock routes are available; one is Route 0 that receives clock signals from DTI0/BRT0/PRT0, and the other is a standby Route 1 (DTI1/BRT1/PRT1) that receives clock signals when no clock signals appear on Route 0. When no clock signals come from either Route 0 or Route 1, the PLO keeps generating the clock signals at the frequency of the last source clock. The PLO can receive different frequencies of source clocks from Route 0 and Route 1.

Figure 1-6shows an example of clock supply route.

Figure 1-6 Clock Supply Route

PBX

TDSW

NOTE

DTI0/BRT0

/PRT0

DTI1/BRT1

/PRT1

PLO

ISDN

:CLOCK SIGNAL SUPPLY ROUTE 0

:CLOCK SIGNAL SUPPLY ROUTE 1

NOTE: DTI0/BRT0/PRT0 and DTI1/BRT1/PRT1 must be mounted in PIM0.

Page 12	NEAX2000 IVS2 ISDN System Manual
	ND-70919 (E), Issue 1.0