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XRT7295ATIW Datasheet(PDF) 7 Page - Exar Corporation |
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XRT7295ATIW Datasheet(HTML) 7 Page - Exar Corporation |
7 / 18 page XRT7295AT 7 Rev.1.20 DS3 SIGNAL REQUIREMENTS AT THE DSX Pulse characteristics are specified at the DSX-3, which is an interconnection and test point referred to as the cross-connect (see Figure 2.) The cross-connect exists at the point where the transmitted signal reaches the distribution frame jack. Table 1 lists the signal requirements. Currently, two isolated pulse template requirements exist: the ACCUNET T45 pulse template (see Table 2 and Figure 4)and the G.703 pulse template (see Table 3 and Figure 5). Table 2 and Table 3 give the associated boundary equations for the templates. The XRT7295AT correctly decodes any transmitted signal that meets one of these templates at the cross-connect. Parameter Specification Line Rate 44.736 Mbps ¦20 ppm Line Code Bipolar with three-0 substitution (B3ZS) Test Load 75 W ¦5% Pulse Shape An isolated pulse must fit the template in NO TAG or Figure 5.1 The pulse amplitude may be scaled by a constant factor to fit the template. The pulse amplitude must be between 0.36vpk and 0.85vpk, measured at the center of the pulse. Power Levels For and all 1s transmitted pattern, the power at 22.368 ± 0.002MHz must be -1.8 to +5.7dBm, and the power at 44.736 ±0.002MHz must be -21.8dBm to -14.3dBm.2, 3 Notes 1 The pulse template proposed by G.703 standards is shown in Figure 5 and specified in Table 3. The proposed G.703 standards further state that the voltage in a time slot containing a 0 must not exceed ± 5% of the peak pulse amplitude, except for the residue of preceding pulses. 2 The power levels specified by the proposed G.703 standards are identical except that the power is to be measured in 3kHz bands. 3 The all 1s pattern must be a pure all 1s signal, without framing or other control bits. Table 1. DSX-3 Interconnection Specification Lower Curve Upper Curve Time Equation Time Equation T ± -0.36 0 T±-0.68 0 -0.36 ± T ± +0.28 0.5 (1+sin {p/2}[1+T/0.18]) -0.68 ± T± +0.36 0.5 (1+sin {p/2} [1+T/0.34]) 0.28 ± T 0.11e-3.42(T-0.3) 0.36 ± T 0.05 + 0.407e-1.84(T-0.36) Table 2. DSX-3 Pulse Template Boundaries for ACCUNET T45 Standards (See Figure 4.) |
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