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XRT75L02 Datasheet(PDF) 5 Page - Exar Corporation |
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XRT75L02 Datasheet(HTML) 5 Page - Exar Corporation |
5 / 50 page XRT75L02 xr xr xr xr TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER REV. 1.0.3 II 5.2 CLOCK AND DATA RECOVERY: .................................................................................................................. 28 FIGURE 17. INTERFERENCE MARGIN TEST SET UP FOR DS3/STS-1................................................................................................ 28 FIGURE 18. INTERFERENCE MARGIN TEST SET UP FOR E3.............................................................................................................. 28 TABLE 9: INTERFERENCE MARGIN TEST RESULTS ........................................................................................................................... 28 5.3 B3ZS/HDB3 DECODER: ................................................................................................................................. 29 5.4 LOS (LOSS OF SIGNAL) DETECTOR: .......................................................................................................... 29 5.4.1 DS3/STS-1 LOS CONDITION: .................................................................................................................................... 29 DISABLING ALOS/DLOS DETECTION:...........................................................................................................29 5.4.2 E3 LOS CONDITION: .................................................................................................................................................. 29 TABLE 10: THE ALOS (ANALOG LOS) DECLARATION AND CLEARANCE THRESHOLDS FOR A GIVEN SETTING OF REQEN (DS3 AND STS-1 APPLICATIONS) ............................................................................................................................................................... 29 5.4.3 MUTING THE RECOVERED DATA WITH LOS CONDITION: ................................................................................... 30 FIGURE 19. LOSS OF SIGNAL DEFINITION FOR E3 AS PER ITU-T G.775 .......................................................................................... 30 FIGURE 20. LOSS OF SIGNAL DEFINITION FOR E3 AS PER ITU-T G.775. ......................................................................................... 30 6.0 JITTER: ................................................................................................................................................31 6.1 JITTER TOLERANCE - RECEIVER: .............................................................................................................. 31 6.1.1 DS3/STS-1 JITTER TOLERANCE REQUIREMENTS: ............................................................................................... 31 FIGURE 21. JITTER TOLERANCE MEASUREMENTS............................................................................................................................ 31 6.1.2 E3 JITTER TOLERANCE REQUIREMENTS:............................................................................................................. 32 FIGURE 22. INPUT JITTER TOLERANCE FOR DS3/STS-1 ................................................................................................................ 32 FIGURE 23. INPUT JITTER TOLERANCE FOR E3 .............................................................................................................................. 32 6.2 JITTER TRANSFER - RECEIVER/TRANSMITTER: ...................................................................................... 33 6.3 JITTER GENERATION: .................................................................................................................................. 33 6.4 JITTER ATTENUATOR: ................................................................................................................................. 33 TABLE 11: JITTER AMPLITUDE VERSUS MODULATION FREQUENCY (JITTER TOLERANCE)................................................................... 33 TABLE 12: JITTER TRANSFER SPECIFICATION/REFERENCES............................................................................................................. 33 TABLE 13: JITTER TRANSFER PASS MASKS .................................................................................................................................... 34 FIGURE 24. JITTER TRANSFER REQUIREMENTS AND JITTER ATTENUATOR PERFORMANCE................................................................ 34 7.0 SERIAL HOST INTERFACE: ...............................................................................................................35 TABLE 14: FUNCTIONS OF SHARED PINS ......................................................................................................................................... 35 TABLE 15: REGISTER MAP AND BIT NAMES .................................................................................................................................... 35 TABLE 16: REGISTER MAP DESCRIPTION - GLOBAL......................................................................................................................... 36 TABLE 17: REGISTER MAP AND BIT NAMES - CHANNEL 0 REGISTERS .............................................................................................. 36 TABLE 18: REGISTER MAP AND BIT NAMES - CHANNEL 1 REGISTERS .............................................................................................. 37 TABLE 19: REGISTER MAP DESCRIPTION - CHANNEL 0.................................................................................................................... 38 8.0 DIAGNOSTIC FEATURES: ..................................................................................................................42 8.1 PRBS GENERATOR AND DETECTOR: ........................................................................................................ 42 8.2 LOOPBACKS: ................................................................................................................................................. 42 8.2.1 ANALOG LOOPBACK:............................................................................................................................................... 42 FIGURE 25. PRBS MODE ............................................................................................................................................................. 42 8.2.2 DIGITAL LOOPBACK: ................................................................................................................................................ 43 8.2.3 IREMOTE LOOPBACK: .............................................................................................................................................. 43 FIGURE 26. ANALOG LOOPBACK ..................................................................................................................................................... 43 FIGURE 27. DIGITAL LOOPBACK...................................................................................................................................................... 43 8.3 TRANSMIT ALL ONES (TAOS): .................................................................................................................... 44 FIGURE 28. REMOTE LOOPBACK .................................................................................................................................................... 44 FIGURE 29. TRANSMIT ALL ONES (TAOS) ...................................................................................................................................... 44 TABLE 20: TRANSFORMER RECOMMENDATIONS .................................................................................................................. 45 TABLE 21: TRANSFORMER DETAILS ................................................................................................................................................ 45 ORDERING INFORMATION.............................................................................................47 PACKAGE DIMENSIONS.................................................................................................47 REVISION HISTORY.......................................................................................................................................48 |
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