XRT75R12D_06 Datasheet, PDF (114/134 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET

XRT75R12D
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.1
2. Testing must be performed for both Incrementing and Decrementing Pointer Adjustments.
8.5.3 Pointer Burst
Figure 56 presents an illustration of the "Pointer Burst" Pointer Adjustment Scenario per Telcordia GR-253-
CORE.
FIGURE 56. ILLUSTRATION OF BURST OF POINTER ADJUSTMENT SCENARIO
Pointer Adjustment Events
Pointer Adjustment Burst Train
0.5ms
t
0.5ms
>30s
Initialization
Cool Down
Measurement Period
Telcordia GR-253-CORE mandates that the Intrinsic Jitter, within the DS3 signal that is de-mapped from a
SONET signal, which is experiencing the "Burst of Pointer Adjustment" scenario, must NOT exceed 1.3UI-pp.
8.5.4 Phase Transients
Figure 57 presents an illustration of the "Phase Transients" Pointer Adjustment Scenario per Telcordia GR-
253-CORE.
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