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CS61574A Datasheet(PDF) 11 Page - Cirrus Logic |
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CS61574A Datasheet(HTML) 11 Page - Cirrus Logic |
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11 / 44 page  Transmitter The transmitter takes digital T1 or E1 input data and drives appropriately shaped bipolar pulses onto a transmission line. The transmit data (TPOS & TNEG or TDATA) is supplied synchronously and sampled on the falling edge of the input clock, TCLK. Either T1 (DSX-1 or Network Interface) or E1 CCITT G.703 pulse shapes may be selected. Pulse shaping and signal level are controlled by "line length select" inputs as shown in Table 3. The CS61575 and CS61574A line drivers are de- signed to drive a 75 Ω equivalent load. For E1 applications, the CS61574A and CS61575 drivers provide 14 dB of return loss during the transmission of both marks and spaces. This im- proves signal quality by minimizing reflections off the transmitter. Similar levels of return loss are provided for T1 applications. For T1 DSX-1 applications, line lengths from 0 to 655 feet (as measured from the transmitter to the DSX-1 cross connect) may be selected. The five partition arrangement in Table 3 meets ANSI T1.102 and AT&T CB-119 requirements when using #22 ABAM cable. A typical output pulse is shown in Figure 8. These pulse settings can also be used to meet CCITT pulse shape requirements for 1.544 MHz operation. For T1 Network Interface applications, two addi- tional options are provided. Note that the optimal pulse width for Part 68 (324 ns) is narrower than the optimal pulse width for DSX-1 (350 ns). The CS61575 and CS61574A automatically adjusts the pulse width based upon the "line length" se- lection made. 500 1.0 0.5 0 -0.5 0 250 750 1000 TIME (nanoseconds) OUTPUT PULSE SHAPE NORMALIZED AMPLITUDE ANSI TI.102, AT&T CB 119 SPECIFICATIONS Figure 8. Typical Pulse Shape at DSX-1 Cross Connect MODE FUNCTION PIN HARDWARE EXTENDED HARDWARE HOST TRANSMITTER 3TPOS TDATA TPOS 4TNEG TCODE TNEG RECEIVER/DPM 6 RNEG BPV RNEG 7RPOS RDATA RPOS 11 DPM AIS DPM 17 MTIP RCODE MTIP 18 MRING - MRING CONTROL 18 - PCS - 23 LEN0 LEN0 INT 24 LEN1 LEN1 SDI 25 LEN2 LEN2 SDO 26 RLOOP RLOOP CS 27 LLOOP LLOOP SCLK 28 TAOS TAOS CLKE Table 2. Pin Definitions LEN2 LEN1 LEN0 Option Selected Application 0 1 1 0-133 FEET DSX-1 ABAM (AT&T 600B or 600C) 1 0 0 133-266 FEET 1 0 1 266-399 FEET 1 1 0 399-533 FEET 1 1 1 533-655 FEET 000 120 Ω (1:1.26) 75 Ω (1:1) E1 CCITT G.703 0 0 1 AT&T CB113 Repeater 0 1 0 FCC PART 68, OPT. A Network Interface 011 ANSI T1.403 Table 3. Line Length Selection CS61574A CS61575 DS154F2 11 |
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Similar Description - CS61574A |
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