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SY89426

SONET OC-12/OC-3 CLOCK SYNTHESIZER

Micrel 

Micrel, Inc.

Precision Edge®

SY89426

JITTER GENERATION

Jitter Generation Definition

Bellcore TR-NWT-000499 (Issue 4), section 7.3.3 "Jitter

generation is the process whereby jitter appears at the output

port of an individual unit of digital equipment in the absence of

applied input jitter."

Jitter Generation Requirement

Bellcore TA-NWT-000253 (Issue 2), section 5.6.5.2 "For

Category II interfaces, jitter generation shall not exceed 0.01

UI rms. For OC-N and STSX-N interfaces, a high-pass

measurement filter with a 12kHz cutoff frequency shall be

used." The low-pass cutoff frequency of the measurement

filter shall be higher than 5MHz.

The characteristic of the measurement filter is shown

below.

SONET OC-12 Category II Jitter Generation Measurement Filter Characteristics

UI (rms)

0.01

+20dB/decade

12kHz

Figure 1

Frequency

5MHz

(minimum)

M9999-112105

hbwhelp@micrel.com or (408) 955-1690

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