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Appendix A Specifications
Jitter and Wander specifications
T-BERD/MTS/SC Getting Started Guide
March 2018 22046537, Rev. 016 Page 229
Modulation specifications
Table 148 describes the modulation specifications for the electrical wander generator.
Error limits
The error limits conform to the requirements of ITU-T Recommendation O.172 (04/
2005) , with a modulation frequency accuracy of ± 0.1%.
Synchronization
When generating wander, the device must be synchronized with an external timing
source. For more details, see
“Reference clock” on page 229 .
Wander measurement
This section provides specifications for wander measurements.
Reference clock
Table 149 lists the wander clock frequency and input level specifications.l
Measurement range
The upper limit of the wander frequency range is set by a first-order low-pass filter. The
sample rate is selected automatically to correspond with the selected low-pass filter.
Table 150 lists the sample rates for various low pass filters.
Table 148 Modulation specifications
Item Description
Jitter modulation signal sinusoidal
Frequency range 10
μ
Hz to 100 MHz
Amplitude range at 155.52 Mbps 0.01 UI to 3600 UI
Table 149 Wander clock frequency and input level specifications
Permissible offset ± 1000 ppm
Wander transfer bandwidth Driven by the low pass filter as specified in
Table 150 on page 229 .
Table 150 Sample rates for various low pass filters
Low pass filter/fc Sample rate
0.1 Hz 1/s
10 Hz 30/s
20 Hz 60/s
100 Hz 1000/s