XRT75R12D_06 Datasheet, PDF (6/134 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET

XRT75R12D
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.1
FIGURE 57. ILLUSTRATION OF "PHASE-TRANSIENT" POINTER ADJUSTMENT SCENARIO .......................................................................... 110
8.5.5 87-3 PATTERN.......................................................................................................................................................... 110
FIGURE 58. AN ILLUSTRATION OF THE 87-3 CONTINUOUS POINTER ADJUSTMENT PATTERN .................................................................. 110
8.5.6 87-3 ADD ................................................................................................................................................................... 111
FIGURE 59. ILLUSTRATION OF THE 87-3 ADD POINTER ADJUSTMENT PATTERN..................................................................................... 111
8.5.7 87-3 CANCEL............................................................................................................................................................ 111
FIGURE 60. ILLUSTRATION OF 87-3 CANCEL POINTER ADJUSTMENT SCENARIO .................................................................................... 112
8.5.8 CONTINUOUS PATTERN......................................................................................................................................... 112
FIGURE 61. ILLUSTRATION OF CONTINUOUS PERIODIC POINTER ADJUSTMENT SCENARIO .................................................................... 112
8.5.9 CONTINUOUS ADD ................................................................................................................................................. 113
FIGURE 62. ILLUSTRATION OF CONTINUOUS-ADD POINTER ADJUSTMENT SCENARIO ............................................................................. 113
8.5.10 CONTINUOUS CANCEL......................................................................................................................................... 113
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. ................................ 114
8.7 A REVIEW OF THE INTRINSIC JITTER AND WANDER CAPABILITIES OF THE LIU IN A TYPICAL SYSTEM
APPLICATION .............................................................................................................................................. 114
8.7.1 INTRINSIC JITTER TEST RESULTS........................................................................................................................ 114
TABLE 42: 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
CHANNEL CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X06................................................................... 117
CHANNEL 1 ADDRESS LOCATION = 0X0E .......................................................... 117
CHANNEL 2 ADDRESS LOCATION = 0X16 ........................................................... 117
CHANNEL CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X06................................................................... 118
CHANNEL 1 ADDRESS LOCATION = 0X0E ............................................................... 118
CHANNEL 2 ADDRESS LOCATION = 0X16 ................................................................. 118
JITTER ATTENUATOR CONTROL REGISTER - (CHANNEL 0 ADDRESS LOCATION = 0X07................................................. 118
CHANNEL 1 ADDRESS LOCATION = 0X0F.................................................... 118
CHANNEL 2 ADDRESS LOCATION = 0X17 .................................................... 118
JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................................. 119
CHANNEL 1 ADDRESS LOCATION = 0X0F.............................................. 119
CHANNEL 2 ADDRESS LOCATION = 0X17 .............................................. 119
JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................................. 119
CHANNEL 1 ADDRESS LOCATION = 0X0F............................................. 119
CHANNEL 2 ADDRESS LOCATION = 0X17 ............................................. 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 ......................................................................................................................... 121
FIGURE 67. ILLUSTRATION OF PROCEDURE WHICH IS USED TO SYNTHESIZE MAJOR PATTERN A....................................................... 121
FIGURE 68. ILLUSTRATION OF MINOR PATTERN P3 ......................................................................................................................... 122
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 ................................... 123
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 43: MEASURED APS RECOVERY TIME AS A FUNCTION OF DS3 PPM OFFSET ............................................................................. 124
JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................................. 125
CHANNEL 1 ADDRESS LOCATION = 0X0F............................................. 125
CHANNEL 2 ADDRESS LOCATION = 0X17 ............................................. 125
8.8.4 HOW SHOULD ONE CONFIGURE THE LIU, IF ONE NEEDS TO SUPPORT "DAISY-CHAIN" TESTING AT THE END
CUSTOMER'S SITE? ................................................................................................................................................... 125
JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................................. 125
CHANNEL 1 ADDRESS LOCATION = 0X0F.................................................... 125
CHANNEL 2 ADDRESS LOCATION = 0X17 .................................................... 125
9.0 ELECTRICAL CHARACTERISTICS ..................................................................................................126
TABLE 44: ABSOLUTE MAXIMUM RATINGS ........................................................................................................................................... 126
TABLE 45: DC ELECTRICAL CHARACTERISTICS:................................................................................................................................... 126
ORDERING INFORMATION.................................................................................................................128
PACKAGE DIMENSIONS - ............................................................................................................................................ 128
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