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XRT75L04D Datasheet(PDF) 9 Page - Exar Corporation |
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XRT75L04D Datasheet(HTML) 9 Page - Exar Corporation |
9 / 98 page áç áç áç áç XRT75L04D REV. 1.0.1 FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER 5 45 33 176 12 TPOS_0 TPOS_1 TPOS_2 TPOS_3 I Transmit Positive Data Input - Channel 0: Transmit Positive Data Input - Channel 1: Transmit Positive Data Input - Channel 2: Transmit Positive Data Input - Channel 3: By default sampled on the falling edge of TxCLK 41 29 4 16 TTIP_0 TTIP_1 TTIP_2 TTIP_3 O Transmit TTIP Output - Channel 0: Transmit TTIP Output - Channel 1: Transmit TTIP Output - Channel 2: Transmit TTIP Output - Channel 3: These pins along with TRING transmit bipolar signals to the line using a 1:1 transformer. 39 27 6 18 TRING_0 TRING_1 TRING_2 TRING_3 O Transmit Ring Output - Channel 0: Transmit Ring Output - Channel 1: Transmit Ring Output - Channel 2: Transmit Ring Output - Channel 3: These pins along with TTIP transmit bipolar signals to the line using a 1:1 trans- former. 50 47 171 174 TxLEV_0 TxLEV_1 TxLEV_2 TxLEV_3 I Transmit Line Build-Out Enable/Disable Select - Channel 0: Transmit Line Build-Out Enable/Disable Select - Channel 1: Transmit Line Build-Out Enable/Disable Select - Channel 2: Transmit Line Build-Out Enable/Disable Select - Channel 3: These input pins are used to select the Transmit Line Build-Out circuit of Chan- nel n. Setting these pins to "High" disables the Line Build-Out circuit of Channel n. In this mode, Channel n outputs partially-shaped pulses onto the line via the TTIP_n and TRing_n output pins. Setting these pins to "Low" enables the Line Build-Out circuit of Channel n. In this mode, Channel n outputs shaped pulses onto the line via the TTIP_n and TRing_n 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 these pins to "1" if the cable length between the Cross-Connect and the transmit output of Channel is greater than 225 feet. 2. Set these pins to "0" if the cable length between the Cross-Connect and the transmit output of Channel is less than 225 feet. These pins are active only if the following two conditions are true: a. The XRT75L04D is configured to operate in either the DS3 or SONET STS-1 Modes. b. The XRT75L04D is configured to operate in the Hardware Mode. NOTES: 1. These pins are internally pulled down. 2. If the XRT75L04D is configured in HOST mode, these pins should be tied to GND. TRANSMIT INTERFACE PIN #SIGNAL NAME TYPE DESCRIPTION |
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