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XRT75R12D Datasheet(PDF) 81 Page - Exar Corporation |
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XRT75R12D Datasheet(HTML) 81 Page - Exar Corporation |
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81 / 134 page  XRT75R12D 76 REV. 1.0.1 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER 2 TAOS R/W Transmit All OneS Pattern - Channel_n: This READ/WRITE bit-field is used to command the Transmit Section of Channel_n to generate and transmit an unframed, All Ones pattern via the DS3, E3 or STS-1 line signal (to the remote terminal equipment). Whenever the user implements this configuration setting, the Transmit Sec- tion will ignore the data that it is accepting from the System-side equipment and output the "All Ones" Pattern. 0 - Configures the Transmit Section to transmit the data that it accepts from the System-side Interface. 1 - Configures the Transmit Section to generate and transmit the Unframed, All Ones pattern. 1 TxCLKINV R/W Transmit Clock Invert Select - Channel_n: This READ/WRITE bit-field is used to select the edge of the TxCLK_n input that the Transmit Section of Channel_n will use to sample the TxPOS_n and TxNEG_n input pins, as described below. 0 - Configures the Transmit Section (within the corresponding channel) to sample the TxPOS_n and TxNEG_n input pins upon the falling edge of TxCLK_n. 1 - Configures the Transmit Section (within the corresponding channel) to sample the TxPOS_n and TxNEG_n input pins upon the rising edge of TxCLK_n. NOTE: This is done on a per-channel basis. 0 TxLEV R/W Transmit Line Build-Out Select - Channel_n: This READ/WRITE bit-field is used to enable or disable the Transmit Line Build-Out (e.g., pulse-shaping) circuit within the corresponding channel. The user should set this bit-field to either "0" or to "1" based upon the follow- ing guidelines. 0 - If the cable length between the Transmit Output (of the corresponding Channel) and the DSX-3/STSX-1 location is 225 feet or less. 1 - If the cable length between the Transmit Output (of the corresponding Channel) and the DSX-3/STSX-1 location is more than 225 feet . The user must follow these guidelines 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 Tel- cordia GR-253-CORE. NOTE: This bit-field is ignored if the channel has been configured to operate in the E3 Mode. TRANSMIT CONTROL REGISTER - CHANNEL N ADDRESS LOCATION = 0XM4 BIT NUMBER NAME TYPE DESCRIPTION |
Similar Part No. - XRT75R12D |
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Similar Description - XRT75R12D |
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