NEC 2400 ipx User Manual download pdf (Page 142)

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101

CHAPTER 2 NDA-24296

Page 116

Revision 1.0

PH-SW10

Time Division Switch

Figure 2-52 shows the clock signal routing around the Phase Locked Oscillator (PLO).

Figure 2-52 PLO Function Diagram

When the system operates as the clock source office of the digital network, the OSC (PA-CK14) card is required,

and the OSC supplies the high-precision clock signals (±0.3 ppm deviation) for the base clock of the PLO. When

the system operates as the clock subordinate office, the TSW internal oscillator (±5 ppm deviation) can be the

base clock of the PLO. The source clock of the subordinate office is either the digital clock supply (DCS) or the

digital interface clock (DIU0 - DIU3). When the clock source failure has occurred, the PLO chooses another

clock source automatically in the order of:

1. DCS0

2. DCS1

3. DIU0

4. DIU1

5. DIU2

6. DIU3

7. Drifting with the TSW internal oscillator

TSW#1

(PH-SW10)

TSW#0 (PH-SW10)

TSW

PLO

OSC#1 (PA-CK14)

OSC#0 (PA-CK14)

DCS 0

DCS 1

DCS 0

DIU 0

DIU 1

DIU 2

DIU 3

Multiple connection on MDF

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NEC 2400 ipx User Manual Page 142

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