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XRT75R03DIV Datasheet(PDF) 2 Page - Exar Corporation |
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XRT75R03DIV Datasheet(HTML) 2 Page - Exar Corporation |
2 / 134 page XRT75R03D REV. 1.0.2 THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER 2 TRANSMIT INTERFACE CHARACTERISTICS • Accepts either Single-Rail or Dual-Rail data from Terminal Equipment and generates a bipolar signal to the line • Integrated Pulse Shaping Circuit • Built-in B3ZS/HDB3 Encoder (which can be disabled) • Accepts Transmit Clock with duty cycle of 30%-70% • Generates pulses that comply with the ITU-T G.703 pulse template for E3 applications • Generates pulses that comply with the DSX-3 pulse template, as specified in Bellcore GR-499-CORE and ANSI T1.102_1993 • Generates pulses that comply with the STSX-1 pulse template, as specified in Bellcore GR-253-CORE • Transmitter can be turned off in order to support redundancy designs RECEIVE INTERFACE CHARACTERISTICS • Integrated Adaptive Receive Equalization (optional) for optimal Clock and Data Recovery • Declares and Clears the LOS defect per ITU-T G.775 requirements for E3 and DS3 applications • Meets Jitter Tolerance Requirements, as specified in ITU-T G.823_1993 for E3 Applications • Meets Jitter Tolerance Requirements, as specified in Bellcore GR-499-CORE for DS3 Applications • Declares Loss of Signal (LOS) and Loss of Lock (LOL) Alarms • Built-in B3ZS/HDB3 Decoder (which can be disabled) • Recovered Data can be muted while the LOS Condition is declared • Outputs either Single-Rail or Dual-Rail data to the Terminal Equipment FIGURE 1. BLOCK DIAGRAM OF THE XRT 75R03D HOST/HW STS-1/DS3_(n) E3_(n) REQEN_(n) RTIP_(n) RRing_(n) SR/DR XRT75R03D XRT75R03D RLB_(n) RLOS_(n) JATx/Rx TPData_(n) TNData_(n) TxClk_(n) TAOS_(n) TxLEV_(n) TxON_(n) Channel 2 Channel 0 Channel 1 Notes: 1. (n) = 0, 1 or 2 for respective Channels 2. Serial Processor Interface input pins are shared by the three Channels in "Host" Mode and redefined in the "Hardware" Mode. Device Monitor MTIP_(n) MRing_(n) DMO_(n) Timing Control TTIP_(n) TRing_(n) Tx Pulse Shaping HDB3/ B3ZS Encoder RLOL_(n) RxON RxClkINV RxClk_(n) RPOS_(n) RNEG_(n)/ LCV_(n) Tx Control Jitter Attenuator MUX Line Driver LOSTHR LLB_(n) Invert Remote LoopBack HDB3/ B3ZS Decoder MUX AGC/ Equalizer Peak Detector LOS Detector Slicer Jitter Attenuator Serial Processor Interface Local LoopBack Clock & Data Recovery Clock Synthesizer E3Clk,DS3Clk, STS-1Clk RESET CS SClk INT SDO SDI CLKOUT |
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