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XRT73L00A Datasheet(PDF) 6 Page - Exar Corporation |
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XRT73L00A Datasheet(HTML) 6 Page - Exar Corporation |
6 / 53 page XRT73L00A áç áç áç áç E3/DS3/STS-1 LINE INTERFACE UNIT REV. 2.0.1 3 PIN DESCRIPTION PIN DESCRIPTION PIN #SYMBOL TYPE DESCRIPTION 1 TXLEV I Transmit Line Build-Out Enable/Disable Select: This input pin is used to enable or disable the Transmit Line Build-Out circuit in the XRT73L00A. Setting this pin to “High” disables the Line Build-Out circuit. In this mode, the XRT73L00A outputs partially shaped pulses onto the line via the TTIP and TRING output pins. Setting this pin to “Low” enables the Line Build-Out circuit. In this mode, the XRT73L00A outputs partially-shaped pulses onto the line via the TTIP and TRING output pins. To comply with the isolated DSX-3/STSX-1 Pulse Template Requirements per Bellcore GR-499-Core or Bellcore GR-253-Core: 1. Set this input pin to a "1" if the cable length between the Cross-Connect and the transmit output of the XRT73L00A is greater than 225 feet. 2. Set this input pin to a "0" if the cable length between the Cross-Connect and the transmit output of the XRT73L00A is less than 225 feet. This pin is active only if both of the following are true: (a) The XRT73L00A is configured to operate in either the DS3 or SONET STS-1 modes and (b) The XRT73L00A is configured to operate in the Hardware Mode. NOTE: This pin should be tied to GND if the XRT73L00A is to be operated in the HOST mode. 2TAOS I Transmit All Ones Select: A “High” on this pin causes a continuous AMI all “1’s” pattern to be transmitted onto the line. The frequency of this “1’s” pattern is determined by TCLK. NOTES: 1. This input pin is ignored if the XRT73L00A is operating in the HOST Mode. 2. Tie this pin to GND if the XRT73L00A is going to be operating in the HOST Mode. 3 TxAVDD **** Transmit Analog Power Supply 4DMO O Drive Monitor Output: If no bipolar line signal is detected on the TTIP/TRING output pins via the MTIP and MRING input pins for 128±32 TCLK periods, then the DMO output pin tog- gles and remains “High” until the next bipolar pulse is detected. 5 TxAGND **** Transmit Analog Ground 6 AGND **** Analog Ground (Substrate) 7 RxAGND **** Receive Analog Ground 8RTIP I Receive TIP Input: This input pin along with RRING is used to receive the line signal from the Remote DS3/E3/STS-1 Terminal. 9RRING I Receive RING Input: This input pin along with RTIP is used to receive the line signal from the Remote DS3/E3/STS-1 Terminal. |
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