2-40
INSTALLATION
ORBAN MODEL 8300
Select
T
IME
P
ROT
if the Optimod is behind a firewall that does not pass UDP
packets.
T
IME
P
ROT
selects the Time Protocol as described in the standard
RFC868. This method uses TCP on port 37.
Select SNTP if your network timeserver supports the Simple Network Time
Protocol as described in standard RFC1769. This method uses UDP on port
123.
Ask your network administrator which protocols are available. SNTP is
slightly more accurate.
B)
Using
S
YNC
P
ERIOD
, choose how often your Optimod will automatically update
its internal clock to the timeserver you selected.
The choices are
O
FF
,
8
HOURS
, and
24
HOURS
.
If the connection to the timeserver fails (due to network overload or
other problems), your Optimod will try once per hour to synchronize un-
til it is successful.
C)
Set the
O
FFSET
to the difference (in hours) between your time zone and Uni-
versal Time (UTC).
UTC is also known as GMT, or Greenwich Mean Time.
The value can range between –12 and +12 hours. If this value is set to 0,
your Optimod’s time will be the same as UTC.
You can empirically adjust this value until the correct time for your location
is displayed after you synchronize your Optimod to a timeserver.
2.
Choose a timeserver.
http://www.boulder.nist.gov/timefreq/service/time-servers.html
provides a cur-
rent list of timeservers available on the Internet. You network may also have a
local timeserver; ask your network administrator.
As of April 2004, NIST’s list was as shown in Table 2-1.
Name
IP Address
Location
time-a.nist.gov 129.6.15.28
NIST, Gaithersburg, Maryland
time-b.nist.gov 129.6.15.29
NIST, Gaithersburg, Maryland
time-a.timefreq.bldrdoc.gov 132.163.4.101
NIST, Boulder, Colorado
time-b.timefreq.bldrdoc.gov 132.163.4.102
NIST, Boulder, Colorado
time-c.timefreq.bldrdoc.gov 132.163.4.103
NIST, Boulder, Colorado
utcnist.colorado.edu 128.138.140.44
University of Colorado, Boulder
time.nist.gov 192.43.244.18
NCAR, Boulder, Colorado
time-nw.nist.gov 131.107.1.10
Microsoft, Redmond, Washington
nist1.datum.com 66.243.43.21
Datum, San Jose, California
nist1-dc.glassey.com 216.200.93.8
Abovenet,
Virginia
nist1-ny.glassey.com 208.184.49.9
Abovenet, New York City
nist1-sj.glassey.com 207.126.98.204
Abovenet, San Jose, California
nist1.aol-ca.truetime.com
207.200.81.113
TrueTime, AOL facility, Sunnyvale, Cali-
fornia
nist1.aol-va.truetime.com 205.188.185.33
TrueTime,
AOL facility, Virginia
Table 2-1: NIST-referenced timeservers
Summary of Contents for 8300J
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