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XRT75R12D Datasheet(PDF) 6 Page - Exar Corporation |
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XRT75R12D Datasheet(HTML) 6 Page - Exar Corporation |
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6 / 133 page  XRT75R12D IV TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.3 FIGURE 56. ILLUSTRATION OF BURST OF POINTER ADJUSTMENT SCENARIO ......................................................................................... 110 8.5.4 PHASE TRANSIENTS............................................................................................................................................... 110 FIGURE 57. ILLUSTRATION OF "PHASE-TRANSIENT" POINTER ADJUSTMENT SCENARIO .......................................................................... 110 8.5.5 87-3 PATTERN .......................................................................................................................................................... 111 FIGURE 58. AN ILLUSTRATION OF THE 87-3 CONTINUOUS POINTER ADJUSTMENT PATTERN .................................................................. 111 8.5.6 87-3 ADD ................................................................................................................................................................... 111 FIGURE 59. ILLUSTRATION OF THE 87-3 ADD POINTER ADJUSTMENT PATTERN..................................................................................... 112 8.5.7 87-3 CANCEL ............................................................................................................................................................ 112 FIGURE 60. ILLUSTRATION OF 87-3 CANCEL POINTER ADJUSTMENT SCENARIO .................................................................................... 112 8.5.8 CONTINUOUS PATTERN ......................................................................................................................................... 113 FIGURE 61. ILLUSTRATION OF CONTINUOUS PERIODIC POINTER ADJUSTMENT SCENARIO .................................................................... 113 8.5.9 CONTINUOUS ADD ................................................................................................................................................. 113 FIGURE 62. ILLUSTRATION OF CONTINUOUS-ADD POINTER ADJUSTMENT SCENARIO ............................................................................. 114 8.5.10 CONTINUOUS CANCEL ......................................................................................................................................... 114 FIGURE 63. ILLUSTRATION OF CONTINUOUS-CANCEL POINTER ADJUSTMENT SCENARIO ....................................................................... 114 8.6 A REVIEW OF THE DS3 WANDER REQUIREMENTS PER ANSI T1.105.03B-1997. ................................ 115 8.7 A REVIEW OF THE INTRINSIC JITTER AND WANDER CAPABILITIES OF THE LIU IN A TYPICAL SYSTEM APPLICATION .............................................................................................................................................. 115 8.7.1 INTRINSIC JITTER TEST RESULTS........................................................................................................................ 115 TABLE 44: SUMMARY OF "CATEGORY I INTRINSIC JITTER TEST RESULTS" FOR SONET/DS3 APPLICATIONS ......................................... 115 8.7.2 WANDER MEASUREMENT TEST RESULTS.......................................................................................................... 116 8.8 DESIGNING WITH THE LIU ......................................................................................................................... 116 8.8.1 HOW TO DESIGN AND CONFIGURE THE LIU TO PERMIT A SYSTEM TO MEET THE ABOVE-MENTIONED INTRIN- SIC JITTER AND WANDER REQUIREMENTS........................................................................................................... 116 FIGURE 64. ILLUSTRATION OF THE LIU BEING CONNECTED TO A MAPPER IC FOR SONET DE-SYNC APPLICATIONS .............................. 116 TABLE 45: CHANNEL CONTROL REGISTER - CHANNEL N, ADDRESS LOCATION; 0XM6 (M = 0-5 & 8-D) (N = [0:11]) ............................... 117 TABLE 46: CHANNEL CONTROL REGISTER - CHANNEL N, ADDRESS LOCATION; 0XM6 (M = 0-5 & 8-D) (N = [0:11]) ............................... 117 TABLE 47: JITTER ATTENUATOR CONTROL REGISTER - CHANNEL N, ADDRESS LOCATION; 0XM7........................................................... 118 TABLE 48: JITTER ATTENUATOR CONTROL REGISTER - CHANNEL N, ADDRESS LOCATION; 0XM7........................................................... 118 TABLE 49: JITTER ATTENUATOR CONTROL REGISTER - CHANNEL N, ADDRESS LOCATION; 0XM7........................................................... 119 8.8.2 RECOMMENDATIONS ON PRE-PROCESSING THE GAPPED CLOCKS (FROM THE MAPPER/ASIC DEVICE) PRIOR TO ROUTING THIS DS3 CLOCK AND DATA-SIGNALS TO THE TRANSMIT INPUTS OF THE LIU ...................... 119 FIGURE 65. ILLUSTRATION OF MINOR PATTERN P1 ......................................................................................................................... 120 FIGURE 66. ILLUSTRATION OF MINOR PATTERN P2 ......................................................................................................................... 120 FIGURE 67. ILLUSTRATION OF PROCEDURE WHICH IS USED TO SYNTHESIZE MAJOR PATTERN A....................................................... 121 FIGURE 68. ILLUSTRATION OF MINOR PATTERN P3 ......................................................................................................................... 121 FIGURE 69. ILLUSTRATION OF PROCEDURE WHICH IS USED TO SYNTHESIZE PATTERN B ................................................................... 122 FIGURE 70. ILLUSTRATION OF THE SUPER PATTERN WHICH IS OUTPUT VIA THE "OC-N TO DS3" MAPPER IC ................................... 122 FIGURE 71. SIMPLE ILLUSTRATION OF THE LIU BEING USED IN A SONET DE-SYNCHRONIZER" APPLICATION......................................... 123 8.8.3 HOW DOES THE LIU PERMIT THE USER TO COMPLY WITH THE SONET APS RECOVERY TIME REQUIREMENTS OF 50MS (PER TELCORDIA GR-253-CORE)? .......................................................................................................... 123 TABLE 50: MEASURED APS RECOVERY TIME AS A FUNCTION OF DS3 PPM OFFSET ............................................................................. 123 TABLE 51: JITTER ATTENUATOR CONTROL REGISTER - CHANNEL N, ADDRESS LOCATION; 0XM7........................................................... 124 8.8.4 HOW SHOULD ONE CONFIGURE THE LIU, IF ONE NEEDS TO SUPPORT "DAISY-CHAIN" TESTING AT THE END CUSTOMER'S SITE? ................................................................................................................................................... 124 TABLE 52: JITTER ATTENUATOR CONTROL REGISTER - CHANNEL N, ADDRESS LOCATION; 0XM7........................................................... 125 9.0 ELECTRICAL CHARACTERISTICS ..................................................................................................126 TABLE 53: ABSOLUTE MAXIMUM RATINGS ........................................................................................................................................... 126 TABLE 54: DC ELECTRICAL CHARACTERISTICS:................................................................................................................................... 126 ORDERING INFORMATION .................................................................................................................128 PACKAGE DIMENSIONS - ............................................................................................................................................ 128 REVISION HISTORY .................................................................................................................................................... 129 |
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