Time: Persistence - GE Multinet 4 Instruction Manual

SYSTEM ADMINISTRATION
Standard Time=UTC:
Daylight Saving Time:
4–6
The table below describes the parameters you can view and edit in the Time: Zone and DST
screen.
Table 4–4: Time: Zone and DST
Field Name
Your offset from the UTC. Value is in hours:minutes. Range is
from -12:59 to 12:59
Examples: UTC Offsets
In enabled use the following fields to specify the period of the
year during which daylight saving time will be in effect either by
specifying the date and time of its beginning and end or by
selecting a pre-defined national DST rule, which will
automatically supply the beginning and ending values. System
time will be automatically adjusted according to the specified
dates.
If disabled standard time will be used throughout the year.
Starts the first...: Specify the day, date, and time when DST begins.
Ends the first...: Specify the day, date, and time when DST ends.
Copy DST rule of: Select a pre-defined national DST rule from the drop-down list.
This will automatically supply the beginning and ending values.

4.2.4.3 Time: Persistence

This screen enables you to set the time and date persistence feature (similar to the "Save
Time Interval" feature offered by other manufacturers). This is used to support systems
that do not have a clock with battery backup. When the power to these systems is cycled,
the clock may come up in an undefined state. With persistence enabled the clock is set to
the last known good time and date. This time and date clearly will not be correct but is
likely to be close enough to the actual time and date that the system will be able to
continue operating without difficulty.
This feature is useful in an environment where a Multinet4 keeps its time and date current
via an NTP server that it accesses through a VPN tunnel that uses certificates for
authentication. If the power to the Multinet4 is cycled and the time and date were to come
up in an undefined state, it is likely that the VPN authentication would fail because the
system's time and date would not match the valid dates on the VPN peer certificate. The
system would then not be able to access the NTP server and would be permanently cut off
MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL
CHAPTER 4: SYSTEM ADMINISTRATION
Field Value
Zone Standard
Eastern (US) -5
Pacific (US) -8
UK 0
Daylight Saving
-4
-7
+1