ND-71762 (E) CHAPTER 2

Page 17

Issue 2

GENERAL INFORMATION FOR CCIS

5.2.2 Sub-Source Office

The Sub-Source Office extracts carrier clocks (24DTI: 1.544 MHz/30DTI: 2.048 MHz) from the DTI opposing to

the Source Office and supplies them to the PLO/OSC (High Precision Oscillator) in the user office.

In preparation for complete clock down from the Source Office, the Sub-Source Office is provided with external

oscillators (EXT. OSC) for backup. Figure 2-12 shows the routes for carrier clock extraction and for backup clocks.

Figure 2-12 Clock Extraction and Backup Routes

External

OSC 0

ACT

Change

CLOCK

Synchronization

Two systems each

ACT

8 kHz (FH)

To Switch

System side

PLO 1

(PH-CK17)

/OSC 1

(PA-CK14)

From DTI

For Backup

Clock receiving route

(max. 4 routes)

PLO 0

(PH-CK17)

/OSC 0

(PA-CK14)

32.768 MHz

External

OSC 1

Note: The OSC (PA-CK14) card is used for the 1-IMG system only.

The PLO (PH-CK17) card is used for the 4-IMG system.

This figure shows an example of the clock supply routes when the PLO0 is in ACT side.

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 137 138

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