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XRT75L04IV Datasheet(PDF) 41 Page - Exar Corporation |
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XRT75L04IV Datasheet(HTML) 41 Page - Exar Corporation |
41 / 57 page XRT75L04 39 REV. 1.0.4 FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR signal (TxClk or RxClk) and clocked out of the FIFO with the dejittered clock. When the FIFO is within two bits of overflowing or underflowing, the FIFO limit status bit, FL_n is set to “1” in the Alarm status register. Reading this bit clears the FIFO and resets the bit into default state. NOTE: It is recommended to select the 16-bit FIFO for delay-sensitive applications as well as for removing smaller amounts of jitter. Table 13 specifies the jitter transfer mask requirements for various data rates: The jitter attenuator in the XRT75L04 meets the latest jitter attenuation specifications and/or jitter transfer characteristics as shown in the Figure 24. TABLE 13: JITTER TRANSFER PASS MASKS RATE (KBITS) MASK F1 (HZ) F2 (HZ) F3 (HZ) F4 (KHZ) A1(dB) A2(dB) 34368 G.823 ETSI-TBR-24 100 300 3K 800K 0.5 -19.5 44736 GR-499, Cat I GR-499, Cat II GR-253 CORE 10 10 10 10k 56.6k 40 - - - 15k 300k 15k 0.1 0.1 0.1 - - - 51840 GR-253 CORE 10 40k - 400k 0.1 - FIGURE 24. JITTER TRANSFER REQUIREMENTS AND JITTER ATTENUATOR PERFORMANCE F1 A1 F2 J IT T E R F R E Q UE NCY (k H z ) A2 F3 F4 |
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