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XRT75R03DIV Datasheet(PDF) 7 Page - Exar Corporation |
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XRT75R03DIV Datasheet(HTML) 7 Page - Exar Corporation |
7 / 135 page XRT75R03D IV REV. 1.0.4 THREE CHANNEL E3/DS3/STS-1 LINE 10.6 A REVIEW OF THE DS3 WANDER REQUIREMENTS PER ANSI T1.105.03B-1997. ............................. 118 10.7 A REVIEW OF THE INTRINSIC JITTER AND WANDER CAPABILITIES OF THE XRT75R03D IN A TYPICAL SYSTEM APPLICATION .............................................................................................................................. 118 10.7.1 INTRINSIC JITTER TEST RESULTS...................................................................................................................... 118 TABLE 32: SUMMARY OF "CATEGORY I INTRINSIC JITTER TEST RESULTS" FOR SONET/DS3 APPLICATIONS................................... 118 10.7.2 WANDER MEASUREMENT TEST RESULTS........................................................................................................ 120 10.8 DESIGNING WITH THE XRT75R03D ......................................................................................................... 120 10.8.1 HOW TO DESIGN AND CONFIGURE THE XRT75R03D TO PERMIT A SYSTEM TO MEET THE ABOVE-MENTIONED INTRINSIC JITTER AND WANDER REQUIREMENTS .............................................................................................. 120 FIGURE 58. ILLUSTRATION OF THE XRT75R03D BEING CONNECTED TO A MAPPER IC FOR SONET DE-SYNC APPLICATIONS ......... 120 CHANNEL CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X06................................................... 121 CHANNEL 1 ADDRESS LOCATION = 0X0E........................................... 121 CHANNEL 2 ADDRESS LOCATION = 0X16 ........................................... 121 CHANNEL CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X06................................................... 122 CHANNEL 1 ADDRESS LOCATION = 0X0E................................................ 122 CHANNEL 2 ADDRESS LOCATION = 0X16 ................................................. 122 JITTER ATTENUATOR CONTROL REGISTER - (CHANNEL 0 ADDRESS LOCATION = 0X07................................. 122 CHANNEL 1 ADDRESS LOCATION = 0X0F.................................... 122 CHANNEL 2 ADDRESS LOCATION = 0X17 .................................... 122 JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................. 123 CHANNEL 1 ADDRESS LOCATION = 0X0F.............................. 123 CHANNEL 2 ADDRESS LOCATION = 0X17 .............................. 123 JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................. 123 CHANNEL 1 ADDRESS LOCATION = 0X0F............................. 123 CHANNEL 2 ADDRESS LOCATION = 0X17 ............................. 123 10.8.2 RECOMMENDATIONS ON PRE-PROCESSING THE GAPPED CLOCKS (FROM THE MAPPER/ASIC DEVICE) PRI- OR TO ROUTING THIS DS3 CLOCK AND DATA-SIGNALS TO THE TRANSMIT INPUTS OF THE XRT75R03D . 123 FIGURE 59. ILLUSTRATION OF MINOR PATTERN P1 .................................................................................................................. 124 FIGURE 60. ILLUSTRATION OF MINOR PATTERN P2 .................................................................................................................. 125 FIGURE 61. ILLUSTRATION OF PROCEDURE WHICH IS USED TO SYNTHESIZE MAJOR PATTERN A ................................................ 125 FIGURE 62. ILLUSTRATION OF MINOR PATTERN P3 .................................................................................................................. 126 FIGURE 63. ILLUSTRATION OF PROCEDURE WHICH IS USED TO SYNTHESIZE PATTERN B............................................................. 126 FIGURE 64. ILLUSTRATION OF THE SUPER PATTERN WHICH IS OUTPUT VIA THE "OC-N TO DS3" MAPPER IC ............................. 127 FIGURE 65. SIMPLE ILLUSTRATION OF THE XRT75R03D BEING USED IN A SONET DE-SYNCHRONIZER" APPLICATION ................... 127 10.8.3 HOW DOES THE XRT75R03D PERMIT THE USER TO COMPLY WITH THE SONET APS RECOVERY TIME RE- QUIREMENTS OF 50MS (PER TELCORDIA GR-253-CORE)? ................................................................................. 127 TABLE 33: MEASURED APS RECOVERY TIME AS A FUNCTION OF DS3 PPM OFFSET ....................................................................... 128 JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................. 129 CHANNEL 1 ADDRESS LOCATION = 0X0F............................. 129 CHANNEL 2 ADDRESS LOCATION = 0X17 ............................. 129 10.8.4 HOW SHOULD ONE CONFIGURE THE XRT75R03D, IF ONE NEEDS TO SUPPORT "DAISY-CHAIN" TESTING AT THE END CUSTOMER'S SITE? .................................................................................................................................. 129 JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................. 129 CHANNEL 1 ADDRESS LOCATION = 0X0F.................................... 129 CHANNEL 2 ADDRESS LOCATION = 0X17 .................................... 129 ORDERING INFORMATION ................................................................................................................ 130 PACKAGE DIMENSIONS - 14X20 MM, 128 PIN PACKAGE ............................................................................... 130 REVISIONS................................................................................................................................................. 131 |
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