XRT75R12D Datasheet, PDF (6/131 Pages) Exar Corporation – TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER

XRT75R12D
TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER
REV. P1.0.1
PRELIMINARY
FOR DS3 APPLICATIONS ........................................................................................................................... 106
TABLE 46: SUMMARY OF "CATEGORY I INTRINSIC JITTER REQUIREMENT PER TELCORDIA GR-253-CORE, FOR DS3 APPLICATIONS ...... 106
8.5.1 DS3 DE-MAPPING JITTER....................................................................................................................................... 107
8.5.2 SINGLE POINTER ADJUSTMENT ........................................................................................................................... 107
8.5.3 POINTER BURST...................................................................................................................................................... 107
FIGURE 55. ILLUSTRATION OF SINGLE POINTER ADJUSTMENT SCENARIO.............................................................................................. 107
8.5.4 PHASE TRANSIENTS............................................................................................................................................... 108
FIGURE 56. ILLUSTRATION OF BURST OF POINTER ADJUSTMENT SCENARIO ......................................................................................... 108
FIGURE 57. ILLUSTRATION OF "PHASE-TRANSIENT" POINTER ADJUSTMENT SCENARIO .......................................................................... 108
8.5.5 87-3 PATTERN.......................................................................................................................................................... 109
8.5.6 87-3 ADD ................................................................................................................................................................... 109
FIGURE 58. AN ILLUSTRATION OF THE 87-3 CONTINUOUS POINTER ADJUSTMENT PATTERN .................................................................. 109
8.5.7 87-3 CANCEL ............................................................................................................................................................ 110
FIGURE 59. ILLUSTRATION OF THE 87-3 ADD POINTER ADJUSTMENT PATTERN..................................................................................... 110
FIGURE 60. ILLUSTRATION OF 87-3 CANCEL POINTER ADJUSTMENT SCENARIO .................................................................................... 110
8.5.8 CONTINUOUS PATTERN......................................................................................................................................... 111
8.5.9 CONTINUOUS ADD ................................................................................................................................................. 111
FIGURE 61. ILLUSTRATION OF CONTINUOUS PERIODIC POINTER ADJUSTMENT SCENARIO .................................................................... 111
8.5.10 CONTINUOUS CANCEL ......................................................................................................................................... 112
FIGURE 62. ILLUSTRATION OF CONTINUOUS-ADD POINTER ADJUSTMENT SCENARIO ............................................................................. 112
FIGURE 63. ILLUSTRATION OF CONTINUOUS-CANCEL POINTER ADJUSTMENT SCENARIO ....................................................................... 112
8.6 A REVIEW OF THE DS3 WANDER REQUIREMENTS PER ANSI T1.105.03B-1997. ................................ 113
8.7 A REVIEW OF THE INTRINSIC JITTER AND WANDER CAPABILITIES OF THE LIU IN A TYPICAL SYSTEM
APPLICATION .............................................................................................................................................. 113
8.7.1 INTRINSIC JITTER TEST RESULTS........................................................................................................................ 113
TABLE 47: SUMMARY OF "CATEGORY I INTRINSIC JITTER TEST RESULTS" FOR SONET/DS3 APPLICATIONS ......................................... 113
8.7.2 WANDER MEASUREMENT TEST RESULTS.......................................................................................................... 114
8.8 DESIGNING WITH THE LIU ......................................................................................................................... 114
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........................................................................................................... 114
FIGURE 64. ILLUSTRATION OF THE LIU BEING CONNECTED TO A MAPPER IC FOR SONET DE-SYNC APPLICATIONS .............................. 114
CHANNEL CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X06................................................................... 115
CHANNEL 1 ADDRESS LOCATION = 0X0E .......................................................... 115
CHANNEL 2 ADDRESS LOCATION = 0X16 ........................................................... 115
CHANNEL CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X06................................................................... 116
CHANNEL 1 ADDRESS LOCATION = 0X0E ............................................................... 116
CHANNEL 2 ADDRESS LOCATION = 0X16 ................................................................. 116
JITTER ATTENUATOR CONTROL REGISTER - (CHANNEL 0 ADDRESS LOCATION = 0X07................................................. 116
CHANNEL 1 ADDRESS LOCATION = 0X0F.................................................... 116
CHANNEL 2 ADDRESS LOCATION = 0X17 .................................................... 116
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 ...................... 117
JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................................. 117
CHANNEL 1 ADDRESS LOCATION = 0X0F.............................................. 117
CHANNEL 2 ADDRESS LOCATION = 0X17 .............................................. 117
JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................................. 117
CHANNEL 1 ADDRESS LOCATION = 0X0F............................................. 117
CHANNEL 2 ADDRESS LOCATION = 0X17 ............................................. 117
FIGURE 65. ILLUSTRATION OF MINOR PATTERN P1 ......................................................................................................................... 118
FIGURE 66. ILLUSTRATION OF MINOR PATTERN P2 ......................................................................................................................... 119
FIGURE 67. ILLUSTRATION OF PROCEDURE WHICH IS USED TO SYNTHESIZE MAJOR PATTERN A....................................................... 119
FIGURE 68. ILLUSTRATION OF MINOR PATTERN P3 ......................................................................................................................... 120
FIGURE 69. ILLUSTRATION OF PROCEDURE WHICH IS USED TO SYNTHESIZE PATTERN B ................................................................... 120
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)? .......................................................................................................... 121
FIGURE 70. ILLUSTRATION OF THE SUPER PATTERN WHICH IS OUTPUT VIA THE "OC-N TO DS3" MAPPER IC ................................... 121
FIGURE 71. SIMPLE ILLUSTRATION OF THE LIU BEING USED IN A SONET DE-SYNCHRONIZER" APPLICATION......................................... 121
TABLE 48: MEASURED APS RECOVERY TIME AS A FUNCTION OF DS3 PPM OFFSET ............................................................................. 122
JITTER ATTENUATOR CONTROL REGISTER - CHANNEL 0 ADDRESS LOCATION = 0X07.................................................. 122
CHANNEL 1 ADDRESS LOCATION = 0X0F............................................. 122
CHANNEL 2 ADDRESS LOCATION = 0X17 ............................................. 122
8.8.4 HOW SHOULD ONE CONFIGURE THE LIU, IF ONE NEEDS TO SUPPORT "DAISY-CHAIN" TESTING AT THE END
CUSTOMER’S SITE? ................................................................................................................................................... 123
IV