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CS61305A-IP1 Scheda tecnica(PDF) 10 Page - Cirrus Logic |
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CS61305A-IP1 Scheda tecnica(HTML) 10 Page - Cirrus Logic |
10 / 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 output options in Table 3 are specified with a 1:1.15 transmitter transformer turns ratio for T1 and a 1:1 turns ratio for E1 without external se- ries resistors. Other turns ratios may be used if approriate resistors are placed in series with the TTIP and TRING pins. Table A1 in the applica- tions section lists other combinations which can be used to provide transmitter impedance match- ing. 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 T1.102-1993 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 re- quirements 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 CS61305A automatically adjusts the pulse width based upon the "line length" selection made. The E1 G.703 pulse shape is supported with line length selections LEN2/1/0 = 0/0/0 and 0/0/1. The pulse width will meet the G.703 pulse shape template shown in Figure 9, and specified in Ta- ble 4. The CS61305A transmitter provides short-circuit current limiting protection and meets OFTEL OTR-001 short-circuit current limiting require- ments for E1 applications. The CS61305A will detect a static TCLK, and will force TTIP and TRING low to prevent trans- mission when data is not present. When any transmit control pin (TAOS, LEN0-2 or LLOOP) is toggled, the transmitter outputs will require ap- proximately 22 bit periods to stabilize. The transmitter will take longer to stabilize when RLOOP is selected because the timing circuitry must adjust to the new frequency. 500 1.0 0.5 0 -0.5 0 250 750 1000 NORMALIZED AMPLITUDE AT&T CB 119 SPECIFICATIONS PULSE SHAPE OUTPUT TIME (nanoseconds) ANSI T1.102, Figure 8. Typical Pulse Shape at DSX-1 Cross Connect LEN2 LEN1 LEN0 Option Selected Application 01 1 0-133 ft DSX-1 ABAM (AT&T 600B or 600C) 10 0 133-266 ft 10 1 266-399 ft 11 0 399-533 ft 11 1 533-655 ft 00 0 75 Ω coax E1 CCITT G.703 00 1 120 Ω twisted-pair 0 1 0 FCC PART 68, OPT. A Network Interface 0 1 1 ANSI T1.403 Table 3. Line Length Selection CS61305A 10 DS157PP3 |
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Descrizione simile - CS61305A-IP1 |
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