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| 型號： | AN-04 |
| 英文描述： | SONET OC-3 Jitter Measurement |
| 中文描述： | 與SONET OC - 3抖動測量 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大?。?/td> | 46K |
| 代理商： | AN-04 |
APPLICATION NOTE
AN-04
3
Micrel
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.
Test Setup for Measuring Jitter Transfer on the SY69743
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
SONET OC-3 Category II Input Jitter Mask for
Jitter Transfer and Jitter Tolerance Measurement
Figure 4
Figure 3
Jitter
Gain
(dB)
0.1
130kHz
-20db/decade
-20
Frequency
Acceptable
Range
A
15
1.5
0.15
10
30
300
6.5kHz
65kHz
Sinusoidal
Input
Jitter
Amplitude
(p-p)
Frequency
-20db/decade
-20db/decade
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).
Figure 5
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.
CH 1
CH 2
Filter
RCK1-4
RIN1-4
SY69743
Filter
51.84MHz/
155.52MHz
HP 3325B Synthesizer
Function Generator
Modulation Source
HP 70841B Pattern Generator
HP 70820A Microwave Transition Analyzer &
HP 70004A Display
Receive
HP 83752A
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