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CDB61575 Datasheet(PDF) 10 Page - Cirrus Logic |
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CDB61575 Datasheet(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 through a 1:2 trans- former. 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. 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 CS61577 automatically adjusts the pulse width based upon the "line length" selection made. The E1 G.703 pulse shape is supported with line leng th selections L E N 2/ 1/0=0/ 0/0 or LEN 2/1 /0= 0/0 /1. As wi th th e CS61 574 , LEN2/1/0=0/0/0 supports the 120 Ω, 3 V output option without external series resistors, but will also support the 75 Ω, 2.37 V output option with an external 4.4 Ω resistor in series with TTIP or TRING. The new LEN2/1/0=0/0/1 code supports the 75 Ω, 2.37 V output option without external series resistors allowing for software selection be- tween the two E1 output options. The pulse width will meet the G.703 pulse shape template shown in Figure 9, and specified in Table 4. The CS61577 will detect a static TCLK, and will force TTIP and TRING low to prevent transmis- sion when data is not present. When any transmit control pin (TAOS, LEN0-2 or LLOOP) is tog- gled, the transmitter outputs will require approximately 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 0 1 1 0-133 FEET DSX-1 ABAM (AT&T 600B or 600C) 100 133-266 FEET 101 266-399 FEET 110 399-533 FEET 111 533-655 FEET 000 75 Ω (with 4.4 Ω resistor) & 120 Ω E1 CCITT G.703 001 75 Ω (without 4.4 Ω resistor) 0 1 0 FCC PART 68, OPT. A NETWORK INTERFACE 011 ANSI T1.403 Table 3. Line Length Selection CS61577 10 DS155PP2 |
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Similar Description - CDB61575 |
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