Wander TDEV Measurements for Inexpensive Oscillator
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1 Wander TDEV Measurements for Inexpensive Oscillator Lee Cosart Symmetricom Geoffrey M. Garner SAMSUNG Electronics (Consultant) IEEE AVB TG
2 Outline Introduction Measurement setup Measurement results Conclusions IEEE AVB November
3 Introduction 1 Annex B of IEEE P802.1AS, D6.2 specifies a wander generation requirement for the free-running LocalClock entity in a time-aware system The wander generation is specified in terms of a Time Deviation (TDEV) mask TDEV is the square root of Time Variance (TVAR), which is defined as [( ) ] TVAR( τ ) = σ x ( τ ) = E Δ x 6 2 = 1 n E ( x + ) 2 i+ 2n 2xi+ n xi 6n i= 1 where τ = nτ = observation interval τ = sampling interval x 0 i 0 = measured phase (time) error at the i th sampling time (the units of x i and σ ( τ ) are the same x IEEE AVB November
4 Introduction 2 TDEV is estimated from a set of measurements as where TDEV( 2 N 3n+ 1 j+ n 1 1 τ ) ( x 2x + ) = 2 6 ( N 3n + 1) x, 2 i+ 2 n i+ n i 6n j= 1 i= j N n = 1, 2,, 3 y denotes the floor function, i.e., the greatest integer less than or equal to y IEEE AVB November
5 Introduction 3 B of IEEE P802.1AS/D6.2 2 states that the wander generation TDEV for the LocalClock entity shall not exceed the mask of Table B- 1 and Figure B-1, reproduced below IEEE AVB November
6 Introduction 4 The measurement interval shall be at least 120 s (i.e., at least 12 times the longest observation interval). The measurement shall be made using a low-pass filter with 3 db bandwidth of 10 Hz, first-order characteristic, and 20 db/decade roll-off. The sampling interval τ 0 shall not exceed 1/30 s. IEEE AVB November
7 Introduction 5 It is desirable to check whether the above specification can be met by inexpensive oscillators currently used in consumer router or bridge products (wireless or wired) This presentation gives measurement results for one such oscillator IEEE AVB November
8 Measurement Setup 1 The measurement was made using an Agilent E1725C Time Interval Analyzer Measurement data collected and analyzed using Symmetricom TimeMonitor Analyzer software E1725C has a single shot timing resolution of 50 ps, more than adequate for this test A 10 MHz reference was supplied to the time interval analyzer from a 5071A Cesium clock The measured oscillator was contained in a consumer-grade wireless router product the Netgear WGR Mbps Wireless Router g wireless 4 10/100 Mbit/s Ethernet LAN ports 1 10/100 Mbit/s Ethernet WAN port The measurements were made on one sample device (i.e., one unit) The oscillator was accessed by removing the top of the wireless router and using an oscilloscope probe IEEE AVB November
9 Measurement Setup 2 Initially, samples were collected over 50 s at a rate of 2.5 khz Later test used 1000 s measurement interval Timestamps were converted to phase deviation, for the TDEV calculation l The measured oscillator frequency was approximately 44 MHz IEEE AVB November
10 Measurement Results 1 TDEV result first 50 s measurement Passes, though not with a large margin IEEE AVB November
11 Measurement Results 2 TDEV result second 50 s measurement Marginally fails IEEE AVB November
12 Measurement Results 3 TDEV result 1000 s measurement Marginally fails IEEE AVB November
13 Measurement Results 4 TDEV result 1000 s measurement, region of marginal failure Mask is exceeded by approximately 16%, at 2 s observation interval IEEE AVB November
14 Measurement Results 5 Frequency measurement over 6 days (note diurnal cycle) IEEE AVB November
15 Measurement Results 6 Frequency measurement over 6 days, detail of final steep increase Maximum rate of frequency change is on the order of /1 min = /s = ppm/s IEEE AVB November
16 Measurement Results 7 Sample temperature (ambient room temperature) and phase error history (red plot is temperature, blue plot is phase error) Temperature variation is representative of conditions in lab for previous measurements (temperature does not change by more than 3 4 deg C) temperature IEEE AVB November
17 Measurement Results 8 TDEV result 6 day measurement interval (observation interval ranged from approximately 15 s to 200 s) TDEV is within an extrapolation of the requirement IEEE AVB November
18 Measurement Results 9 Frequency and temperature measurement over 14 days (red plot is temperature, t blue plot is frequency) Temperature measurement is at oscillator (it is higher than slide 16 temperature because that is ambient room temperature) Results are qualitatively similar to 6-day results; note diurnal cycle IEEE AVB November
19 Conclusions Measured TDEV is either very close to the mask or marginally fails for observation intervals in the range of approximately 1 3 s For observation intervals less than 0.5 s, measured TDEV is well within the mask For temperature conditions in the lab (slide 16), maximum rate of frequency change is on the order of ppm/s This indicates that the current 802.1AS assumption of 4 ppm/s or 1 ppm/s (assumption 9 of Annex Z) is extremely conservative Frequency variation over 14 days is qualitatively similar to variation over 6 days The results are very promising, but indicate that the present TDEV requirement should be increased to allow for margin for observation intervals in the range 1 3 s It appears an increase in the mask by a factor of 2 would suffice, providing the performance for timing transport is acceptable (this must be checked via simulation) IEEE AVB November
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