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CXR Larus 80-100-400 Issue 2 July 2006 page
3-3
3.3 Cards
3.31
Model 54511 T1 Input Card
3.311 For the front panel of the Model 54511, refer to Figure 3-1.
3.312 Digital Signal Level 1 (DS1) Input Signals:
a. In conjunction with the backplane of the Model 54500-17 shelf, supports
two T1 inputs with three termination alternatives:
1. Terminating input, 100 ohms, digital signal crossconnect (DSX-1) signal
per AT&T CB 119. Pulse amplitude range 0.5 volt to 3.6 volts base to
peak.
2. Bridging input, 964 ohms. Same signal levels as item 1.
3. Monitor input, 100 ohms. Pulse amplitude range 0.05 volt to 0.36 volt
base to peak. For use with external 432 ohm bridging resistors.
b. One-wire interface input from the 54550 for setting framing and an input
select line from the track and hold for selecting which input signals to place
on the output lines.
c. Serial Data input from both track and hold cards to the transceiver.
d. Serial Clock from both track and hold cards to the transceiver.
e. Transceiver Select lines from both track and hold cards.
3.313 Framing
Format:
Superframe (SF) or extended superframe (ESF) on each input automatically
selected by the corresponding track and hold card
3.314 Line
Code:
Alternate mark inversion (AMI) or bipolar eight zero substitution (B8ZS),
automatic selection on each input
3.315 Automatic Line Buildout (ALBO):
Dynamic range 0 to 36 dB
3.316 Duty
Cycle:
50% for all input types
3.317 Ones
Density:
Not less than 12.5%; no more than 15 consecutive zeros for DS1 inputs
