Alpha Technologies PowerAgent SC3 - Manual (Page 28)

PowerAgent TM SC3 Site Controller Document # 700-000014-01 Rev 2
Installation and Operation
Phoenix Broadband Technologies, LLC 10/28/2010
Page 28 of 57
5.9.6 Time Server Configuration (6)
The Site Controller can set its internal clock from any internet time server that supports Network
Time Protocol (NTP). There are many such servers around the world. Many of these servers are
operated by government standards organizations. Most private networks also have time servers.
The Site Controller is shipped with the NTP configuration set to get the time from two different US
National Institute of Standards time servers. The IP addresses of these servers can be changed
in the NTP Configuration. If the time server addresses are not configured or the Site Controller is
unable to contact either time server the Site Controller will initialize the time to 00:00:00 1/1/2008.
If communications is not established with a time server the internal clock will run from this point.
The time provided by most time servers is Greenwich Mean Time (GMT). The Site Controller will
convert this to Local Time using a time offset that can be entered in the NTP Configuration.
To configure the NTP select
option 6 from the
Configuration Main Menu.
Enter the IP addresses as
described in the IP Address
section of this manual. There
are two Time Server addresses. The Site Controller will use the
primary server unless it fails to respond and then it will switch to
the secondary. It will not switch back unless the secondary
server fails to respond or the Site Controller is reset. To change a
default Time Server IP Address to undefined, enter zeros for the
IP address.
The Site Controller will reset itself if there is no communications
with either time server for approximately 2 hours. To disable the
reset function enter zero for all 4 octets of the primary time server
IP address. The Site Controller will use the secondary Time
Server to set the time if the second IP address valid.
The time read from the time server is GMT. There is an option in
the NTP Setup to enter a time offset to correct the time to read
local time. If the time offset is positive, east of the UK, simply
enter the offset in minutes. If the time offset is negative, west of
the UK, the offset must be entered in 2’s compliment form. To
compute the value subtract the time offset in minutes from 65536
and enter the result. For example the offset to Eastern Daylight
time is 4 hours. 65536 - 240 = 65296 Enter 65296 as the time
offset for Eastern Daylight time. The table to the left contains the
offset value for each major time zone.
To save the changes, type ”9” from the menu. The changes will
be saved in nonvolatile memory, the telnet session will be
terminated, and the Site Controller will reset.
Time Offset
from GMT
Time
Zone Time
Offset
12 NZST 720
11 660
10 GST 600
9 JST 540
8 CCT 480
7 420
6 360
5.5 IST 330
5 300
4 240
3 BT 180
2 EET 120
1 CET 60
0 GMT 0
-1 WAT 65476
-2 AT 65416
-3 65356
-4 AST 65296
-5 EST 65236
-6 CST 65176
-7 MST 65116
-8 PST 65056
-9 YST 64996
-10 AHST 64936
-11 NT 64876
-12 IDLW 64816