DOC 4380A
4380A O & M Manual
26
098-00723-000
– Jul 2017 Revision 4.0
SyncSystem 4380A O&M Manual
Once the delay of the distribution network is known the OTP of the system can be shifted from the output
of the 4380A to the input of user equipment. Use the
dist_delay
command to enter the delay value into the
4380A and move the OTP to the end user systems. Once entered use the
save
command to save this delay
value to ensure the unit is properly aligned at startup.
2.8
Using an External Frequency Reference:
Users may decide to provide an EXTERNAL frequency reference to the 4380A. The external frequency
reference may be monitored by the 4380A via a RS232 connection through either of the USB Connectors
on the rear of the unit (94001-5071A). The Microsemi 5071A is currently the only model supported; users
should contact Microsemi about the possibility of utilizing other clocks. The serial port on the 5071A must
be set to 9600 Baud, No Parity, 8 Data Bits, and 1 Stop Bit (9600,N,8,1) and a null modem serial cable will
be required.
CAUTION
Prior to setting the reference to external, ensure the 10MHz signal from the reference is connected to the
10MHz IN connector on the rear of the 4380A. If not, the 4380A outputs may not remain within
specifications and it could take up to several hours for the system to begin providing outputs within their
specifications.
Avant de placer la référence à externe, assurez le signal 10MHz de la référence est relié au 10MHz DANS
le connecteur sur l'arrière du 4380A. Sinon, les sorties 4380A peuvent ne pas demeurer selon des
caractéristiques et il pourrait prendre à plusieurs heures pour que le système commence à fournir des sorties
selon leurs caractéristiques.
4380A
5071
External reference
USB
To
Serial
Null Modem
Cable
USB
RS-232
(DTE)
10 MHz
Port 1/2
10 MHz In
Figure 8 External Frequency Reference
Current status can be determined using the
status reference:frequency:external
command.
4380A>status reference:frequency:external
[communications] N/A
[locked] true
[signal] present
[OK] 2015-08-05T17:17:08Z
4380A
User 1
User 2
User 3
Figure 7 Timing System Diagram
User 4
PPS Output 1
PPS Output 2
PPS Output 3
PPS Output 4
OLD OTP
NEW OTP
Delay 1
Delay 2
Delay 3
Delay 4
Delay 1 = Delay 2 = Delay 3 = Delay 4 =
Distribution_Delay
Summary of Contents for SyncSystem 4380A
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