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XRT59L91 Datasheet(PDF) 8 Page - Exar Corporation |
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XRT59L91 Datasheet(HTML) 8 Page - Exar Corporation |
8 / 28 page XRT59L91 8 Rev. P2.00 Preliminary SYSTEM DESCRIPTION The XRT59L91 device is a single channel E1 trans- ceiver that provides an electrical interface for 2.048Mbps applications. XRT59L91 includes a receive circuit that converts an ITU-T G.703 compliant bipolar signal into a TTL compatible logic levels. Each receiver also includes an LOS (Loss of Signal) detection circuit. Similarly, in the Transmit Direction, the Transmitter converts TTL compatible logic levels into a G.703 compatible bipolar signal. The Transmitter may be operated in either a “Clocked” or “Clockless” Mode. The XRT59L91 device consists of both a Transmit Section and a Receive Section; each of these sections will be discussed in detail below. 1.0 The Transmit Section In general, the purpose of the “Transmit Section” (within the XRT59L91 device) is to accept TTL/CMOS level digital data (from the Terminal Equipment), and to encode it into a format such that it can: 1. Be efficiently transmitted over coaxial- or twisted- pair cable at the E1 data rate; and 2. Be reliably received by the Remote Terminal Equipment at the other end of the E1 data link. 3. Comply with the ITU-T G.703 pulse template requirements, for E1 applications. The circuitry that the Transmit Section (within the XRT59L91 device) uses to accomplish this goal is discussed below. The Transmit Section of the XRT59L91 device consists of the following blocks: l Transmit Input Interface l Pulse Shaping Block 1.1 The Transmit Input Interface The Transmit Input Interface accepts either “clocked” or “clockless” data from the Terminal Equipment. The manner in which the Terminal Equipment should apply data to the XRT59L91 device depends upon whether the device is being operated in the “clocked” or “clockless” mode. 1.2.1 Operating the Transmitter in the Clocked Mode The user can configure the XRT59L91 device to operate in the “Clocked” mode by simply applying a 2.048MHz clock signal to the “TxClk” input pin. The XRT59L91 device contains detectioncircuitry that sense activity on the “TxClk” line. If this circuit senses activity on the “TxClk” line, then the XRT59L91 will automatically be operating in the “Clocked” Mode. In the Clocked Mode, a 2.048 mHz clock should be applied toTxClk input pin and NRZ data at the TxPOS and TxNEG input pins. The “Transmit Input Interface” circuit will sample the data, at the TxPOS and TxNEG input pins, upon the falling edge of TxClk, as illustrated below. |
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