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| SONET OC-3 JITTER MEASUREMENT APPLICATION NOTE AN-04 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 in Figure 1. SONET OC-3 Category II Jitter Generation Measurement Filter Characteristics UI (rms) 0.01 +20dB/decade 12kHz Frequency 5MHz (minimum) Figure 1 Rev.: C Amendment: /0 1 Issue Date: June, 1998 Micrel APPLICATION NOTE AN-04 JITTER GENERATION (Continued) Measuring Jitter Generation on the SY69743 Jitter Generation is measured on the TCLK1-4 outputs from the device. These outputs are differential ECL signals at the 51.84MH/155.52MHz rate that is synthesized from the reference clock input of 12.96MHz or 19.44MHz. Measuring Jitter Generation on the SY69952 Jitter Generation is measured on the TCLK outputs from the device. These outputs are differential ECL signals at the 51.84MHz/155.52MHz rate that is synthesized from the reference clock inputs of 6.84MHz or 19.44MHz. Test Setup for Measuring Jitter Generation on the SY69743 HP 11801B Digital Oscilloscope TCLK1-4 TCLK HP70841B 12.96MHz or 19.44MHz HP83752A Synthesized Sweeper SY69743 Transmit { 51.84MHz/ 155.52MHz HP3325B Synthesizer Figure 2 2 Micrel APPLICATION NOTE AN-04 JITTER TRANSFER Jitter Transfer Definition Bellcore TR-NWT-000499 (Issue 4), section 7.3.2: "The transfer of jitter through an individual unit of digital equipment is characterized by the relationship between the applied input jitter and the resulting output jitter as a function of frequency. For equipment in which a linear process describes the transfer of jitter from the input to the output port, the jitter transfer function is the ratio of the output jitter spectrum to the applied (deterministic) input jitter spectrum. (The term transfer function implies a linear process, where the conventional definition of linearity applies, i.e., a process that is both additive and homegeneous.)" SONET OC-3 Category II Jitter Transfer Function Jitter Transfer Requirement Bellcore TA-NWT-000253 (Issue 2), section 5.6.3.2: "For Category II interfaces, the jitter transfer function shall be under the curve in Figure 3, when input sinusoidal jitter up to the mask level in Figure 4 is applied, with the parameters specified in Figure 3 for each OC-N rate." Figures 3 and 4 show the Bellcore specification for Jitter Transfer. ITU/CCITT Recommendation G.958, section 6.3.2, is stated similarly to Bellcore specification. Jitter Gain (dB) 0.1 SONET OC-3 Category II Input Jitter Mask for Jitter Transfer and Jitter Tolerance Measurement A 15 -20db/decade Acceptable Range Sinusoidal Input Jitter Amplitude (p-p) -20db/decade 1.5 -20db/decade -20 0.15 130kHz Frequency 10 30 300 6.5kHz 65kHz Frequency Figure 3 Figure 4 Measuring Jitter Transfer on the SY69743 Jitter Transfer is the relationship between jitter applied at the input and the resulting output jitter as a function of frequency. On the SY69743 jitter transfer is measured by applying sinusoidal input jitter at the serial data input to the receive section. The receive section then recovers the data and clock and provides the recovered clock, RCK1-4, and recovered data, RSER1-4, to the outside world. Jitter transfer is measured at the RCK1-4 outputs (51.84MHz or 155.52MHz). Test Setup for Measuring Jitter Transfer on the SY69743 HP 70820A Microwave Transition Analyzer & HP 70004A Display CH 1 CH 2 Filter RCK1-4 HP 3325B Synthesizer Function Generator Filter RIN1-4 SY69743 Modulation Source 51.84MHz/ 155.52MHz HP 70841B Pattern Generator HP 83752A Receive Figure 5 3 Micrel APPLICATION NOTE AN-04 JITTER TOLERANCE Jitter Tolerance Definition 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 1dB 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: "OC3/STS-3 and OC-3 Category II SONET interfaces shall tolerate, as a minimum, the input jitter applied according to the mask in Figure 3, with the parameters specified in the figure for OC-3." Test Setup for Measuring Jitter Tolerance on the SY69743 HP 70820A Microwave Transition Analyzer & HP 70004A Display CH 2 Filter HP 70842B Error Detector & HP70004A Display HP 3325B Synthesizer Function Generator RIN 51.84MHZ/ 155.52MHZ HP 70841B Pattern Generator & HP 83752A RCK1-4 Transmit SY69743 Receive Modulation Source Figure 6 APPENDIX Equipment List HP 0955-0969 155.52Mb/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 83752A (Range 10MHz - 20MHz) 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 70874C 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 TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA FAX + 1 (408) 980-9191 + 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. (c) 2000 Micrel Incorporated 4 |
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