XRT75L00D Datasheet, PDF (77/92 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

REV. 1.0.2
XRT75L00D
E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
FIGURE 52. ILLUSTRATION OF THE 87-3 ADD POINTER ADJUSTMENT PATTERN
Added Pointer Adjustment
43 Pointer Adjustments
43 Pointer Adjustments
No Pointer
Adjustments
T
t
Telcordia GR-253-CORE defines an "87-3 Add" Pointer Adjustment, as the "87-3 Continuous" Pointer
Adjustment pattern, with an additional pointer adjustment inserted, as shown above in Figure 52.
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 "87-3 Add" pattern of Pointer Adjustments, must not exceed 1.3UI-pp.
9.5.7 87-3 Cancel
Figure 53 presents an illustration of the 87-3 Cancel Pattern Pointer Adjustment Scenario per Telcordia GR-
253-CORE.
FIGURE 53. ILLUSTRATION OF 87-3 CANCEL POINTER ADJUSTMENT SCENARIO
86 or 87 Pointer Adjustments
No Pointer
Adjustments
T
Cancelled
Pointer Adjustment
72