AN-03 [ETC]

SONET OC-12 Jitter Measurement ; SONET OC -12的抖动测量\n


型号：	AN-03
厂家：	ETC
描述：	SONET OC-12 Jitter Measurement SONET OC -12的抖动测量\n
文件：	总6页 (文件大小：59K)
中文：	中文翻译
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SONET OC-12

JITTER MEASUREMENT

APPLICATION NOTE

AN-03

JITTER GENERATION

Jitter Generation Definition

Jitter Generation Requirement

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."

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

5MHz

(minimum)

12kHz

Frequency

Figure 1

Rev.: C

Amendment:/0

Issue Date: June, 1998

APPLICATION NOTE

AN-03

Micrel

JITTER GENERATION (continued)

Measuring Jitter Generation on the SY69712 Transmit

Measuring Jitter Generation on the SY69712 Receive

Jitter generation is measured on the CKE622 output from

the device. This output is a differential ECL signal at the

622.08MHz rate that is synthesized from the reference clock

input of 77.76MHz, 51.84MHz or 19.44MHz. Figure 2a shows

the test setup for measuring jitter generation on the SY69712

transmit.

Jitter generation is measured on the CKE622 (recovered

clock) output from the device. This output is recovered from

the clock recovery circuit. Figure 2b shows the test setup for

measuring jitter generation on the SY69712 receive.

Test Setup for Measuring Jitter Generation

on the SY69612 and SY69712 Transmit

HP 70820A Microwave Transition Analyzer &

HP 70004A Display

CH 1

Filter

HP 70841B Pattern Generator &

HP 70311A Clock Source

÷ 8 / ÷ 12 / ÷ 32

RFCLKIN

CKE622

SY69612

77.76MHz,

51.84MHz

SY69712

19.44MHz

Figure 2a

Test Setup for Measuring Jitter Generation

on the SY69712 Receive

HP 70820A Microwave Transition Analyzer &

HP 70004A Display

CH 1

Filter

SDIN

622MHz

CKE622

(recovered clock)

HP 3325B Synthesizer

Function Generator

SY69712

HP 70841B Pattern Generator &

HP 70311A Clock Source

Figure 2b

APPLICATION NOTE

AN-03

Micrel

JITTER TRANSFER

Jitter Transfer Definition

Jitter Transfer Requirement

Bellcore TA-NWT-000253 (Issue 2), section 5.6.3.2: "For

Bellcore TR-NWT-000499 (Issue 4), section 7.3.2:

"The transfer of jitter through an individual unit of digital CategoryIIinterfaces,thejittertransferfunctionshallbeunder

equipment is characterized by the relationship between the the curve in Figure 4, when input sinusoidal jitter up to the

applied input jitter and the resulting output jitter as a function masklevelinFigure5isapplied,withtheparametersspecified

of frequency. For equipment in which a linear process in Figure 4 for each OC-N rate."

describes the transfer of jitter from the input to the output port,

Figures 4 and 5 show the Bellcore specification for Jitter

the jitter transfer function is the ratio of the output jitter Transfer.

spectrum to the applied (deterministic) input jitter spectrum.

ITU/CCITTRecommendationG.958,section6.3.2,isstated

(Thetermtransferfunctionimpliesalinearprocess, wherethe similarly to Bellcore specification.

conventional definition of linearity applies, i.e., a process that

is both additive and homegeneous.)"

Measuring Jitter Transfer on the SY69712

Jitter Transfer is measured by applying the appropriate

reference frequency (77.76MHz, 51.84MHz or 19.44MHz) to

the RFCLKIN. The jitter on the synthesized 622MHz Clock

output is then measured and compared to the jitter on the

RFCLKIN to determine the jitter transfer of the Transmit PLL.

Test Setup for Measuring Jitter Transfer

on the SY69712

HP 70820A Microwave Transition Analyzer &

HP 70004A Display

CKE622

CH 1

Filter

CH 2

Filter

HP 3325B Synthesizer

Function Generator

Transmit

RFCLKIN

SY69712

÷ 8 / ÷ 12 / ÷ 32

77.76MHz/

Modulation Source

51.84MHZ/

HP 70841B Pattern Generator

19.44MHZ

& HP 70311A Clock Source

Figure 3a

APPLICATION NOTE

AN-03

Micrel

JITTER TRANSFER (continued)

Figure 3b shows the test setup for measuring jitter transfer

on the SY69712 receive.

Measuring Jitter Transfer on the SY69712 Receive

Jitter transfer is measured at the CKE622 (recovered

clock) output.

Test Setup for Measuring Jitter Transfer

on the SY69712 Receive

HP 70820A Microwave Transition Analyzer &

HP 70004A Display

CKE622 (recovered clock)

CH 1

CH 2

Filter

HP 3325B Synthesizer

Function Generator

Filter

SDIN

SY69712

622MHz

Modulation Source

HP 3325B Pattern Generator &

HP 70311A Clock Source

Figure 3b

SONET OC-12 Category II Input Jitter Mask

for Jitter Transfer and Jitter Tolerance

Measurement

SONET OC-12 Category II Jitter

Transfer Function

Jitter

Gain

(dB)

0.1

-20db/decade

Sinusoidal

Input

Jitter

Amplitude

(p-p)

-20db/decade

1.5

Acceptable

Range

-20

0.15

500kHz

Frequency

300

25kHz 250kHz

Frequency

Figure 5

Figure 4

APPLICATION NOTE

AN-03

Micrel

JITTER TOLERANCE

Measuring Jitter Tolerance on the SY69712

Jitter Tolerance Definition

On the SY69712 jitter tolerance is measured by applying

sinusoidal input jitter at the serial data input. Jitter tolerance

ismeasuredatSDOUT(retimeddata)withCKE622(recovered

clock). Figure 6 shows the test setup for measuring jitter

tolerance.

Bellcore TA-NWT-000253 (Issue 2), section 5.6.4.2:

“For Category II SONET interfaces, jitter tolerance is defined

as the peak-to-peak amplitude of sinusoidal jitter applied on

the input OC-N/STS-N signal that causes a 1-dB power

penalty. This is a stress test intended to ensure that no

additional penalty is incurred under operating conditions.”

Jitter Tolerance Requirement

Bellcore TA-NWT-000253 (Issue 2), section 5.6.4.2:

"OC-12 Category II SONET interface shall tolerate, as a

minimum, the input jitter applied according to the mask in

Figure 4 and 5, with the parameters specified in the figure for

OC-12."

Test Setup for Measuring Jitter Tolerance

on the SY69712

HP 70820A Microwave Transition Analyzer &

HP 70004A Display

CH 2

Filter

(Recovered Clock & Data)

SDOUT

CKE622

SDIN

HP 70842B Error Detector &

HP 70004A Display

SY69712

HP 3325B Synthesizer

Function Generator

Receive

622MHz Data

Modulation Source

HP 70841B Pattern Generator &

HP 70311A Clock Source

Figure 6

APPLICATION NOTE

AN-03

Micrel

APPENDIX

Equipment List

HP 0955-0732 622 Mb/s Bandpass Filter (2)

HP 3325B Synthesizer Function Generator

HP 6623A System DC Power Supply

HP 7090A Measurement Plotting System

HP 8082A Pulse Generator

HP 8493C 6dB Attenuator

HP 70001A Mainframe

HP 70004A Color Display

HP 70311A Clock Source (Range 16.1MHz - 3.3GHz)

HP 70820A Microwave Transition Analyzer

HP 70841B Pattern Generator (Range 0.1 - 3 Gbit/s)

HP 70842B Error Detector (Range 0.1 - 3 Gbit/s)

HP 70874A Eye Diagram Analyzer Personality Card

HP 70874B Jitter Analyzer Personality Card

HP 53132A 225 MHz Universal Counter with high

frequency option

HP 85700A 32 kbyte RAM Card

Tektronix 11801B Digital Sampling Oscilloscope

SD26 Sampling Heads (4)

MICREL-SYNERGY 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA

TEL + 1 (408) 980-9191 FAX + 1 (408) 914-7878 WEB http://www.micrel.com

This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or

other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.

AN-03 [ETC]

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