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XRT75VL00DIV Datasheet(PDF) 5 Page - Exar Corporation |
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XRT75VL00DIV Datasheet(HTML) 5 Page - Exar Corporation |
5 / 92 page XRT75VL00D 2 REV. 1.0.4 E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER 4.3.2 Interfacing to the line: ....................................................................................................................... 26 4.4 TRANSMIT DRIVE MONITOR: ............................................................................................................................. 26 Figure 16. Transmit Driver Monitor set-up. ..................................................................................................... 26 4.5 TRANSMITTER SECTION ON/OFF: ...................................................................................................................... 27 5.0 The Receiver Section: ...................................................................................................................... 27 5.1 AGC/EQUALIZER: ............................................................................................................................................ 27 5.1.1 Interference Tolerance: ..................................................................................................................... 27 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 .............................................................................................. 29 5.2 CLOCK AND DATA RECOVERY: ......................................................................................................................... 29 5.3 B3ZS/HDB3 DECODER: .................................................................................................................................. 29 5.4 LOS (LOSS OF SIGNAL) DETECTOR: ................................................................................................................ 29 5.4.1 DS3/STS-1 LOS Condition: ................................................................................................................ 29 TABLE 10: THE ALOS (ANALOG LOS) DECLARATION AND CLEARANCE THRESHOLDS FOR A GIVEN SETTING OF REQEN (DS3 AND STS-1 APPLICATIONS) ......................................................................................... 30 DISABLING ALOS/DLOS DETECTOR: ......................................................................................................... 30 5.4.2 E3 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. .................................................................... 31 5.4.3 Muting the Recovered Data with LOS condition: ............................................................................ 31 6.0 Jitter: ................................................................................................................................................. 32 6.1 JITTER TOLERANCE - RECEIVER: ...................................................................................................................... 32 Figure 21. Jitter Tolerance Measurements ..................................................................................................... 32 6.1.1 DS3/STS-1 Jitter Tolerance Requirements: ..................................................................................... 32 Figure 22. Input Jitter Tolerance For DS3/STS-1 .......................................................................................... 33 6.1.2 E3 Jitter Tolerance Requirements: ................................................................................................... 33 Figure 23. Input Jitter Tolerance for E3 ......................................................................................................... 33 TABLE 11: JITTER AMPLITUDE VERSUS MODULATION FREQUENCY (JITTER TOLERANCE) ..................................... 34 6.2 JITTER TRANSFER - RECEIVER/TRANSMITTER: .................................................................................................. 34 TABLE 12: JITTER TRANSFER SPECIFICATIONS ................................................................................................... 34 6.3 JITTER GENERATION: ....................................................................................................................................... 34 6.4 JITTER ATTENUATOR: ...................................................................................................................................... 34 TABLE 13: JITTER TRANSFER PASS MASKS ....................................................................................................... 35 Figure 24. Jitter Transfer Requirements and Jitter Attenuator Performance .................................................. 35 7.0 Serial Host interface: ....................................................................................................................... 35 TABLE 14: FUNCTIONS OF SHARED PINS ............................................................................................................ 36 TABLE 15: REGISTER MAP AND BIT NAMES ....................................................................................................... 36 TABLE 16: REGISTER MAP DESCRIPTION ........................................................................................................... 37 TABLE 17: REGISTER MAP DESCRIPTION - GLOBAL ............................................................................................ 41 8.0 Diagnostic Features: ........................................................................................................................ 43 8.1 PRBS GENERATOR AND DETECTOR: ................................................................................................................ 43 Figure 25. PRBS MODE ................................................................................................................................. 43 8.2 LOOPBACKS: ............................................................................................................................................... 43 8.2.1 ANALOG LOOPBACK: ....................................................................................................................... 43 Figure 26. Analog Loopback ........................................................................................................................... 44 8.2.2 DIGITAL LOOPBACK: ........................................................................................................................ 44 Figure 27. Digital Loopback ............................................................................................................................ 45 8.2.3 REMOTE LOOPBACK: ....................................................................................................................... 45 Figure 28. Remote Loopback ......................................................................................................................... 45 8.3 TRANSMIT ALL ONES (TAOS): ................................................................................................................... 45 Figure 29. Transmit All Ones (TAOS) ............................................................................................................. 46 9.0 THE SONET/SDH DE-SYNC FUNCTION within THE liu ................................................................ 47 9.1 BACKGROUND AND DETAILED INFORMATION - SONET DE-SYNC APPLICATIONS .......................... 47 Figure 30. A Simple Illustration of a DS3 signal being mapped into and transported over the SONET Network 48 9.2 MAPPING/DE-MAPPING JITTER/WANDER ................................................................................................ 49 |
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