FHF ExResistTel IP2/IP154, Operating Instructions Manual

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Manual ResistTel IP2 / IP152 Page 303
ExResistTel IP2 / IP154
Entry field Description
•
USA – Pacific Time (UTC - 8)
String If the timezone to be used is not one of the predefined timezones, it
can be configured with a string in accordance with the IEEE POSIX
standard.
Timezone Configuration String
Time services always provide the coordinated world time UTC (Universal Time
Coordinated), which corresponds to GMT (Greenwich Mean Time), not however the
correct time zone and summer time. It is therefore possible to specify the time
difference between the time zone and the world time in the String field. The
difference from the time zone GMT+1 (Central European time zone) is 60 minutes. A
further 60 minutes has to be added with summer time, adding up to a total
difference of 120 minutes. In this case, however, you must adjust the time difference
manually when switching from winter to summer time and vice versa.
If a so-called timezone string was entered in the String field, the device can make
the switch from summer to winter time automatically. The name of the time zone,
the name of the summer time zone and their respective differences in time compared
to the UTC and the time switch points are encoded in this field.
There are various formats for the specification of this string. These formats are
defined by the IEEE POSIX standard. POSIX timezone strings have the following
format (optional parts in square brackets):
StdOffset[Dst[Offset], Date/Time, Date/Time]
Std
stands for the time zone (for example, CET for Central European Time or MET
for Middle European Time).
Offset
specifies the time difference between the time zone and UTC, for example, -1
for Central European Time. The difference is negative if the time zone is ahead of
UTC. If the time difference does not comprise full hours, the number of minutes can
be added, for example, -1:30. The TZ string ends here if you are not using a summer
time.
Dst
stands for the summer time zone (for example, CEST for Central European
Summer Time or MEST for Middle European Summer Time).