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XRT75VL00DIV Datasheet(PDF) 10 Page - Exar Corporation |
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XRT75VL00DIV Datasheet(HTML) 10 Page - Exar Corporation |
10 / 92 page XRT75VL00D E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER REV. 1.0.3 5 51 TRING O Transmit Ring Output The XRT75VL00D uses this pin along with TTIP to transmit a bipolar signal to the line using a 1:1 transformer. 1TxLEV I Transmit Line Build-Out Enable/Disable Select This input pin is used to enable or disable the Transmit Line Build-Out circuit. Setting this pin to "High" disables the Line Build-Out circuit. In this mode, par- tially-shaped pulses are output onto the line via the TTIP and TRING output pins. Setting this pin to "Low" enables the Line Build-Out circuit. In this mode, shaped pulses are output onto the line via the TTIPand 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 pin to "1" if the cable length between the Cross-Connect and the transmit output is greater than 225 feet. 2. Set this pin to "0" if the cable length between the Cross-Connect and the transmit output is less than 225 feet. This pin is active only if the following two conditions are true: a. The XRT75VL00D is configured to operate in either the DS3 or SONET STS- 1 Modes. b. The XRT75VL00D is configured to operate in the Hardware Mode. NOTES: 1. This pin is internally pulled down. 2. If the XRT75VL00D is configured in HOST mode, this pin may be tied to GND. TRANSMIT INTERFACE PIN #SIGNAL NAME TYPE DESCRIPTION |
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