DOC 4380A
4380A O & M Manual
36
098-00723-000
– Jul 2017 Revision 4.0
SyncSystem 4380A O&M Manual
The active line will display false when the fans are functioning normally and true for one or both fans if
they are not. If a fan is having issues you will see the number of occurrences increment up from 0 as each
event occurs.
3.1.6 Status Pushbutton
When pressed, this button will display the 4380A’s current IP Address if the address has been by a DHCP
Server or statically. If the system is set up to use DHCP and it was unable to obtain an IP Address the
system will set the IP Address to 0.0.0.0 and will not display an IP Address when this button is pressed.
After displaying the IP address (if set) the unit will display the system status screen.
The third feature of this button is enabled by default. If this button is pressed for ~10 seconds it will set the
IP Address on the system to 192.168.0.1. This is a temporary setting and it will not survive a system reboot
or power cycle and may even reset if the LAN cable is pulled from the rear panel. This feature can be
disabled using the
frontpanel_button
command and setting the value to 0. Once set the value can be
confirmed using the
settings hardware
command. Make sure to
save
the system settings.
4380A>frontpanel_button 0
OK
4380A>settings hardware
[enable_fp_button] false
3.2 Rear Panel
All hardware interfaces and connectors are located on the rear panel of the 4380A. The system can provide
eight types of output timing signals: 1 PPS, 10 MHz, 5MHz, 1MHz, DC IRIG, AM IRIG, NASA36, and
the downstream 4380A reference signals depending on which output modules are installed and the system
configuration settings. Each output module has four connectors. These outputs can be used to directly feed
other instruments or feed a distribution system that provides any number of user outputs. The on-time-
point (OTP) of the system is typically at the output of the BNC connectors (Section 2.6) but it can be
adjusted to be any point in an integrated system by accounting for distribution delays and adjusting the
antenna delay value (Section 2.7).
Figure 10 4380A Rear Panel
Under normal operations the only inputs required for operation of the 4380A are at least one power source
and a GPS Antenna. GPS is the source of time (UTC) for the unit and the 4380A will not start up normally
without it. Once at least four satellites have been acquired the unit will continue to output timing signals
even when the GPS antenna is removed. However, the accuracy of these outputs will degrade over time.
Connection to a local area network (LAN) is supported by the 4380A. This allows users to access the unit
remotely and also provides error monitoring capabilities. In addition, the 4380A can serve as the source of
network time for other systems on the network if using network time protocol (NTP). The system can only
support ~100 NTP users. The USB ports can be used in conjunction with a USB-to-Serial conversion cable
to allow users access to the command port via a local terminal and/or allows the system to communicate
with an external reference (5071A). The GPS Antenna connector is used to connect the GPS Antenna to
the system. The 10MHz IN connector is used to provide the 10MHz signal input from an external
frequency reference. See the figure below.
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