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XR-T7295IW Datasheet(PDF) 9 Page - Exar Corporation |
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XR-T7295IW Datasheet(HTML) 9 Page - Exar Corporation |
9 / 20 page XR-T7295 9 Rev. 1.05 STS-1 SIGNAL REQUIREMENTS AT THE STSX For STS-1 operation, the cross-connect is referred at the STSX-1. Table 5 lists the signal requirements at the STSX-1. Instead of the DS3 isolated pulse template, an eye diagram mask is specified for STS-1 operation (TA-TSY-000253). The XR-T7295 correctly decodes any transmitted signal that meets the mask shown in Figure 6 at the STSX-1. Parameter Specification Line Rate 51.84 Mbps Line Code Bipolar with three-0 substitution (B3ZS) Test Load 75 Ω$5% Power Levels A wide-band power level measurement at the STSX-1 interface using a low-pass filter with a 3dB cutoff frequency of at least 200MHz is within -2.7 dBm and 4.7 dBm. Table 5. STSX-1 Interconnection Specification Figure 6. STSX-1 Isolated Pulse Template for Bellcore TA-TSY-000253 1.0 0.8 0.6 0.4 0.2 0 -1.0 -0.5 0 0.5 1.0 1.5 2.0 Time Slots - Normalized To Peak Location LINE TERMINATION AND INPUT CAPACITANCE The recommended receive termination is shown in Figure 3 The 75 Ω resistor terminates the coaxial cable with its characteristic impedance. The 0.01 µF capacitor to RIN couples the signal into the receive input without disturbing the internally generated DC bias level present on RIN. The input capacitance at the RIN pin is 2.8pF typical (SOJ package) and 3.6pF typical (DIP package). LOSS LIMITS FROM THE DSX-3 TO THE RECEIVE INPUT The signal at the cross-connect may travel through a distribution frame, coaxial cable, connector, splitters, and back planes before reaching the XR-T7295 device. This section defines the maximum distribution frame and cable loss from the cross-connect to the XR-T7295 input. The distribution frame jack may introduce 0.6 $0.55 dB of loss. This loss may be any combination of flat or shaped (cable) loss. The maximum cable distance between the point where the transmitted signal exits the distribution frame jack and the XR-T7295 device is 450 ft. (see Figure 2.) The coaxial cable (Type 728A) used for specifying this distance limitation has the loss and phase characteristics shown in Figure 7 and Figure 8. Other cable types also may be acceptable if distances are scaled to maintain cable loss equivalent to Type 728A cable loss. TIMING RECOVERY External Loop Filter Capacitor Figure 3 shows the connection to an external 0.1 µF capacitor at the LPF1/LPF2 pins. This capacitor is part of the PLL filter. A non-polarized, low-leakage capacitor should be used. A ceramic capacitor with the value 0.1 µF $ 20% is acceptable. |
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