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XRT75R03D Datasheet(PDF) 10 Page - Exar Corporation |
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XRT75R03D Datasheet(HTML) 10 Page - Exar Corporation |
10 / 135 page XRT75R03D 6 THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCRONIZER REV. 1.0.4 37 7 8 TAOS_0 TAOS_1 TAOS_2 I Transmit "All Ones" Input - Channel 0: Transmit "All Ones" Input - Channel 1: Transmit "All Ones" Input - Channel 2: These input pin are used to configure the Transmit Section of the corre- sponding channel to generate and transmit an unframed "All Ones" pattern via the DS3, E3 or STS-1 line signal to the remote terminal equipment. When this configuration is implemented the Transmit Section will ignore the data that it is accepting from the System-side equipment and will overwrite this data will the "All Ones" Pattern. "Low" - Does not configure the channel to transmit an unframed "All Ones" Pattern to the remote terminal equipment. In this mode, the Transmit Sec- tion of the Channel will output data based upon the signals that are applied to the TxPOS_n and TxNEG_n input pins. "High" - Configures the Channel to transmit an unframed "All Ones" Pattern to the remote terminal equipment. In this mode, the Transmit Section will override the data that is applied to the TxPOS_n and TxNEG_n input pins, and will proceed to generate and transmit an unframed "All Ones" pattern. 4. This input pin is ignored if the XRT75R03D is operating in the HOST Mode and should be tied to GND. 5. These input pins are internally pulled down. 36 9 10 TxLEV_0 TxLEV_1 TxLEV_2 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: These input pins are used to enable or disable the Transmit Line Build-Out (e.g., pulse-shaping) circuit within the corresponding channel. The user should set these input pins either "High" or "Low" based upon the following guidelines. "Low" - If the cable length between the Transmit Output of the correspond- ing Channel and the DSX-3/STSX-1 location is 225 feet or less. "High" - If the cable length between the Transmit Output of the correspond- ing Channel and the DSX-3/STSX-1 location is 225 feet or more. NOTES: 1. These guidelines must be followed in order to insure that the Transmit Section of Channel_n will always generate a DS3 pulse that complies with the Isolated Pulse Template requirements per Bellcore GR-499-CORE, or an STS-1 pulse that complies with the Pulse Template requirements per Telcordia GR-253-CORE. 2. This input pin is inactive if the XRT75R03D has been configured to operate in the Host Mode, or if the corresponding channel has been configured to operate in the E3 Mode. If either of these cases are true, then tie this input pin to GND. 3. These input pins are internally pulled "Low". SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS PIN # SIGNAL NAME TYPE DESCRIPTION |
Similar Part No. - XRT75R03D_06 |
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Similar Description - XRT75R03D_06 |
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