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XRT81L27IV Datasheet(PDF) 1 Page - Exar Corporation |
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XRT81L27IV Datasheet(HTML) 1 Page - Exar Corporation |
1 / 30 page Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com áç áç áç áç XRT81L27 SEVEN CHANNEL E1 LINE INTERFACE UNIT WITH CLOCK RECOVERY NOVEMBER 2001 REV. 1.1.0 GENERAL DESCRIPTION The XRT81L27 is an optimized seven-channel, ana- log, 3.3V, line interface unit, fabricated using low pow- er CMOS technology. The device contains seven in- dependent E1 channels, including data and clock re- covery circuits. It is primarily targeted towards the SDH multiplexers that accommodate TU12 Tributary Unit Frames. Line cards in these units multiplex 21 E1 channels into higher SDH rates. Devices with seven E1 interfaces such as the XRT81L27 provide the most efficient method of implementing 21-channel line cards. Each channel performs the driver and re- ceiver functions necessary to convert bipolar signals to logical levels and vice versa. The receiver input accepts transformer or capacitor coupled signals, while the transmitter is coupled to the line using a 1:2 step-up transformer. The same transformer configuration can be used for both bal- anced 120 Ω and unbalanced 75 Ω interfaces. The Receiver Loss of Original Detection is compliant to G.775 and in Host Mode, the number of zeros re- ceived before RLOS is declared can be increased to 4096 bits. This feature provides the user with the flex- ibility to implement RLOS specifications that require greater than G.775 requirements FEATURES • Seven (7) Independent E1 (CEPT) Line Interface Units (Transmitter, Receiver, and Recovery) • Transmit Output Pulses that are Compliant with the ITU-T G.703 Pulse Template Requirement for 2.048Mbps (E1) Rates • On-Chip Pulse Shaping for both 75 Ω and 120Ω line drivers • Receiver Can Either Be Transformer or Capacitive- Coupled to the Line • Detects and Clears LOS (Loss of Signal) Per ITU-T G.775 and ETS 300 233 (programmable from Host) • Compliant with the ITU-T G.823 Jitter Tolerance Requirements • 3.3V operation with 5V Input compatibility • Low power consumption APPLICATIONS • SDH and lPDH Multiplexers • E1 Digital Cross-Connect Systems • DECT (Digital European Cordless Telephone) Base Stations • CSU/DSU Equipment FIGURE 1. BLOCK DIAGRAM Channel 6 Channel 5 Channel 4 Channel 3 Channel 2 Channel 1 Channel 0 Encoder MUX Timing Control TX Pulse Shaper Remote Loopback Decoder MUX Data & Timing Recovery Peak Detector Receive Equalizer Digital Loopback Analog Loopback LOS Detect Line Driver SR/DR Microprocessor Serial Interface (MSI) SDO MODE RClkP MCLK CS SDI SClk Timing Control TPOS_n LOS_n RNEG_n RClk_n RPOS_n TAOS_n PDTx_n TNEG_n TCLK_n ICT TTIP_n TRING_n RTIP_n RRING_n TClkP Encoded PDATA Encoded NDATA MCLK LBM LBEN Global Control TCLKP RST |
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