CXR 54500-16, Руководство пользователя

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CXR Larus 80-100-400 Issue 2 July 2006 page
3-61
3.42 Model 54571 T1 Output Driver Card
3.4210 For the switch location and front panel of the Model 54571, refer to Figure
3-12.
3.4211 Input
Signal:
Differential 1.544 MHz TTL clock signal from one of the two track and hold
cards or, if both of these have failed, from one of the two input reference
signals. The card provides for automatic selection of these input references.
Automatic selection can be overridden by manual remote selection.
3.4212 Output Signals:
DS1 framed all ones, SF or ESF framing, common frame and multiframe
synchronization with other DS1 output cards. The leftmost output card
produces frame synchronization for the rest of the output cards; plugging in
an output card does not cause an error on another card's output.
3.4213
Output Load Impedance:
100 ohms ±5%, resistive
3.4214
Output Pulse Amplitude:
3 volts ±0.6 volt peak; meets AT&T CB 119 and CCITT G.703 requirements.
Rise time <100 ns, overshoot
≤
10% of peak to base amplitude.
3.4215 Duty
Cycle:
50% ±5%; pulse width 324 ns ±10%, pulse interval 648 ns ±10%
3.4216 Rearrangement Phase Transient during Switching of Input Signals:
MTIE 324 nanoseconds maximum; phase change rate less than 20 ns in any
14 milliseconds. Long-term maximum phase discontinuity (wander) on a
separate output module will not exceed a magnitude of 35 ns for any
observation interval.
3.4217
Number of Outputs:
Ten per card; monitor jack (-20 dB) for output #1
3.4218
Output Connectors (on backplane):
Wirewrap, for up to 22 AWG shielded pair
3.4219 Output
Jitter:
Less than 0.03 UI peak to peak from 10 Hz to 40 kHz
3.4220 Drive:
Each output capable of driving a standard DS1 receiver through 655 feet of
low-capacitance 22 AWG office cable