Model 9289
Spectracom Corporation
NetClock/NTP Network Time Provider Instruction Manual
3-40
Software Fault:
One or more software sub-systems have experienced a major run-time
error. This is a Major alarm.
Time Sync Alarm:
The period of time allotted for operation without tracking sufficient
qualified satellites has expired. The factory default period is 2 hours.
This is a Major alarm.
GPS Receiver Fault:
The CPU cannot communicate with the GPS receiver. This is a Major
alarm.
Power Failure:
The NetClock has lost power. This is both a Major and a Minor alarm.
Antenna Problem:
The antenna sense circuitry warns when the antenna is not connected or
a cable short or open is detected. This is a Minor alarm.
3.4.7 Configuring
GPS
The System GPS screen (Figure 3-44) allows the user to configure the GPS receiver to provide
more accurate results and faster start up. Provided the GPS antenna is properly connectd,
however, it is not necessary to change the factory default settings for the unit to receive and
synchronize to GPS time.
ANTENNA CABLE DELAY:
By setting the correct antenna cable delay, the on-time point is
offset by the delay value to compensate for the antenna and in-line amplifier delays. Under
typical conditions, the expected cable and amplifier delays are negligible. You can calculate the
delay based on the manufacture’s specifications.
The range of the cable delay is from 0 to 999999 nanoseconds. The default value is 0
nanoseconds and the resolution is 1 nanosecond.
Summary of Contents for 9289
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