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CXR Larus 80-100-400 Issue 2 July 2006 page
3-46
3.3816 Input
Sensitivity:
-7.5 dB to 0 dB, 3 volts b-pk
3.3817 Outputs:
a. Serial data link to 54550 Information Management Card for performance,
alarm, control, and personality information.
b. Alarm lead to 54560 Alarm Interface Card for excess bit slip between track
and hold cards (one bit slip in 30 minutes) or LOF or LOS on input being
monitored.
c. Sync Status Messaging report to 54550 Information Management Card
through serial link.
d. One-wire interface used by the 54550 to determine whether or not the
54541 is installed.
3.3818 Measurements:
a. Continuous monitoring of bit slip between track and hold cards; alarm
output to 54550 and 54560 if this is greater than one slip every 30 minutes.
b. DS1 error and performance parameters:
•
Out of frame (OOF) events (includes AIS)
•
LOS events
•
BPV errored seconds count
•
CRC6 errored seconds counts (for ESF):
•
Mild
- 1 to 319 CRC6 errors
•
Severe
- 320 or more CRC6 errors
•
Frame errored seconds (for SF)
•
Timing parameters, using currently active clock as a reference (phase
sampling rate 60,000 times per second):
1. Time interval error (TIE) and maximum time interval error (MTIE)
over selected interval. Measurement resolution will be less than or
equal to 0.5 nanosecond.
NOTE:
TIE and MTIE are calculated from phase data processed through a 10 Hz low pass filter.
2. Peak to peak wander below 10 Hz over selected intervals; also
over 5-minute or 24-hour intervals.
3. Peak to peak jitter in 10 Hz to 23 kHz band over 1-second intervals.
NOTE:
The clock recovery circuit used for jitter measurement acts as a single pole low pass
filter for jitter frequencies above 23 kHz.
3.3819 Raw Phase Measurement:
Raw unfiltered phase data for any of the five inputs, 32 phase samples per
