Symmetricom TimeProvider 100, Руководство пользователя, Страница: 50 / 124

50 TimeProvider 100 User’s Guide 098-00106-000 Revision A – March, 2009
Chapter 4 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 100, so if the TimeProvider 100 is
power-cycled, the time line will be adjusted. The following rules apply and are
intended to keep the time line in the logs from having negative time jumps:

When the TimeProvider 100 powers up, the latest entry in the
event
and
command
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 will become the
starting point for the internal date and time. In other words, while the unit is
powered, the time line will proceed from that reference.

As entries that will be logged occur, the entries will reflect the current time and
date (based on reference described in the prior bullet). These entries become
candidates for the “latest entry” discovery on the next power-up.

When the CLI command
set clock
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. See
set clock , on page 72 for more information.
TimeProvider 100 Logs
The TimeProvider 100 provides two types of non-volatile logs: Event and
Command.
Event Log
Event log provides timestamped entries whenever any of the conditions associated
with the events identified in
Table 4-2 are set or cleared. Additionally, other
significant actions such as reboot, resetting time (see set clock , on page 72) and
changes to the PLL state also generate log entries. The event log can be viewed
using
show log event
.
Command Log
Command log provides timestamped entries of user command history. Additionally,
other significant actions such as session log on, session log off, reboot, and
resetting time also generate log entries. The command log can be viewed using
show log command
.