VTI Instruments EX2500A, Руководство пользователя

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EX2500A Web Page Operation 59
LXI S
YNCHRONIZATION
The LXI Synchronization web page provides status on the EX2500A’s synchronization status.
F
IGURE
5-8: LXI S
YNCHRONIZATION
W
EB
P
AGE
•
IEEE 1588 Parameters
o PTP Grandmaster Clock MAC : indicates the MAC address of the device on the
network to which all other IEEE 1588 compliant devices are synchronized.
o
PTP Parent Clock MAC : indicates the MAC address of the device to which the
EX2500A is synchronized. On a LAN that consists of multiple subnets, this indicates the
MAC address of the parent clock on that particular subnet.
o
PTP State : indicates whether the EX2500A is a master, slave, faulty, disabled, passive,
or unlocked.
o
Current PTP Time : indicates the number of seconds since midnight January 1, 1970
UTC (coordinated universal time).
o
Current Local Time : indicates the date and time (in 24-hour format).
o
Grandmaster Traceability to UTC : indicates how the grandmaster is synchronized to
the UTC. The values provide an indicator of how closely synchronized the grandmaster is
to UTC time.
Value Clock Source UTC Synchronization
ATOM UTC Atomic Clock Less than 100 ns
GPS GPS Receiver Less than 100 ns
NTP Network Time Protocol Less than 50 ms
HAND Manually/Automatically Set Less than 10 s
INIT User Defined Not specified
DFLT None None
T
ABLE
5-1: UTC G
RANDMASTER
C
LOCK
I
DENTIFIERS
o
Current Variance of Parent : this function not currently supported by the EX2500A.
o IEEE 1588 Domain : indicates the instrument’s PTP subdomain. Typically, this indicator
is _DFLT.
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