XRT75VL00D datasheet(78/92 Pages) EXAR

78 / 92 page

XRT75VL00D

E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

REV. 1.0.3

Telcordia GR-253-CORE defines an "87-3 Cancel" Pointer Adjustment, as the "87-3 Continuous" Pointer

Adjustment pattern, with an additional pointer adjustment cancelled (or not executed), as shown above in

Figure 53.

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 Cancel" pattern of Pointer Adjustments, must not exceed

1.3UI-pp.

9.5.8

Continuous Pattern

Figure 54 presents an illustration of the "Continuous" Pointer Adjustment Scenario per Telcordia GR-253-

CORE.

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 "Continuous" pattern of Pointer Adjustments, must not exceed 1.0UI-

pp. The spacing between individual pointer adjustments (within this scenario) can range from 7.5ms to 10s.

9.5.9

Continuous Add

Figure 55 presents an illustration of the "Continuous Add Pattern" Pointer Adjustment Scenario per Telcordia

GR-253-CORE.

FIGURE 54. ILLUSTRATION OF CONTINUOUS PERIODIC POINTER ADJUSTMENT SCENARIO

Initialization

Measurement Period

Repeating Continuous Pattern (see below)

Pointer Adjustment Events

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