Symmetricom TimeProvider 500, Руководство пользователя

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70 TimeProvider 500 2.0 User’s Guide 098-00172-000 Revision A – December, 2009
Chapter 3 Operations
Date & Time
Date & Time
Use the
set time
command to set the time and date. The time and date is used for
log entries and some responses.
There is no real-time clock in the TimeProvider 500, so if the TimeProvider 500 is
power-cycled, the time line is adjusted. The following rules apply and are intended
to keep the time line in the logs from having negative time jumps:

When the TimeProvider 500 powers up, the latest entry in the event and
configuration logs are checked for date and time. The latest entry is the last one
written into the respective log.

The date and time of the latest entries are compared to see which one contains
the most recent time and date. The most recent (date and time-wise) one
becomes the starting point for internal date and time. In other words, while the
unit is powered, the time line proceeds from that reference.

As entries that will be logged occur, the entries reflects the current time and date
(based on reference described in prior bullet). These entries become candidates
for the “latest entry” discovery on the next power-up.

When set clock time is used, the date and time are immediately updated. Since
this places an entry in the logs, this provides a new timeline basis for the next
power-up.

When PTP flow has been locked, the clock is automatically set.
TimeProvider 500 Logs
The TimeProvider 500 provides two types of non-volatile logs: Event and
Configuration.
Event Log
The event log provides timestamped entries whenever any of the conditions
associated with the events identified in
Table 3-3 are set or cleared. Additionally,
other significant actions also generate log entries, such as power-on, resetting of
time (see
set clock
command), clearing of the log, and changes of FLL state. The
log can be viewed using
show log event
.
Configuration Log
The configuration log provides timestamped entries whenever a user setting is
changed, thus providing a history of configuration actions. Additionally, other
significant actions also generate log entries, such as session logon and logout,
power-on, clearing of the log, and resetting of time. The configuration log can be
viewed using
show log configuration
.