NEC NEAX2000 IVS2 system manual Plo

CHAPTER 1 GENERAL INFORMATION

System Configuration

PLO

The Phase Locked Oscillator (PLO) equipped on the MP card is responsible to synchronize the system to Q-SIG clocks.

The PLO generates the clock signals according to the source clocks received from network. The source clock signals are extracted at DTI cards and supplied to the PLO. Two clock routes are available; one is the Route 0 to receive clock signals from DTI0, and the other is a standby Route 1 (DTI1) to receive clock signals when no clock signals appear on the Route 0. When clock signals come from neither the Route 0 nor the Route 1, the PLO keeps generating the clock signals with the frequency of previous source clock. The PLO can receive different frequency of source clocks from the Route 0 and Route 1.

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

Figure 1-6 Clock Supply Route Configuration

PBX
TDSW
NOTE
DTI0	Q-SIG
	NETWORK
DTI1
PLO

: CLOCK SIGNAL SUPPLY ROUTE 0

: CLOCK SIGNAL SUPPLY ROUTE 1

NOTE: DTI0 and DTI1 must be mounted in PIM0.

NEAX2000 IVS2 Q-SIG System Manual	Page 9
ND-70923 (E), Issue 1.0