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CXR Larus 80-100-400 Issue 2 July 2006 page
3-30
3.3614 Framing
Format:
a. DS1
Inputs
SF or ESF on each DS1 input automatically selected or set from 54550
through the serial port.
b. E1
Inputs
CAS or CCS and CRC4 ON or OFF for each E1 input automatically
selected or set from 54550 through the serial port.
c. 2048 kHz Inputs
Does not apply.
d. CC/5MHz/10MHz/RS-422 Inputs
Does not apply
3.3615 Line
Code:
Does not apply.
3.3616 Input
Impedance:
Does not apply.
3.3616 Input
Sensitivity:
0.3 to 1.5 volts RMS.
3.3617 Jitter
Tolerance:
Per Bellcore TR-NWT-000499 and ITU-T G.824.
3.3618 Input Signal Selection:
Input to track and hold cards A and B is normally from their own fully integrated
GPS receiver. If the normal GPS input fails, the track and hold card will post
an alarm and try to acquire the DS1/E1 primary inputs from the backplane. If
the DS1/E1 inputs are not present, the track and hold card will enter the HOLD
state and post an alarm or stay in the FREERUN state.
3.3619 External
Reference/Input:
5 MHz or 10 MHz at 0.3 to 1.5 volts RMS into an impedance of 50 ohms.
This feature is not available for reference replacement on the track and hold
cards but can be used as tertiary input (i.e., able to be tracked).
3.3620 Oscillator:
Ovenized crystal oscillator exceeds Stratum 3E/LNC specifications.
