Orban Optimod-FM 8300 Operating Manual page 88

2-40
INSTALLATION
 Select T
P
IME ROT
packets. T
IME
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
P
YNC ERIOD
its internal clock to the timeserver you selected.
The choices are O
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
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
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
time-a.nist.gov
time-b.nist.gov
time-a.timefreq.bldrdoc.gov
time-b.timefreq.bldrdoc.gov
time-c.timefreq.bldrdoc.gov
utcnist.colorado.edu
time.nist.gov
time-nw.nist.gov
nist1.datum.com
nist1-dc.glassey.com
nist1-ny.glassey.com
nist1-sj.glassey.com
nist1.aol-ca.truetime.com
nist1.aol-va.truetime.com
if the Optimod is behind a firewall that does not pass UDP
selects the Time Protocol as described in the standard
P
ROT
, choose how often your Optimod will automatically update
, 8 , and 24
FF HOURS HOURS
to the difference (in hours) between your time zone and Uni-
IP Address
129.6.15.28
129.6.15.29
132.163.4.101
132.163.4.102
132.163.4.103
128.138.140.44
192.43.244.18
131.107.1.10
66.243.43.21
216.200.93.8
208.184.49.9
207.126.98.204
207.200.81.113
205.188.185.33
Table 2-1: NIST-referenced timeservers
ORBAN MODEL 8300
.
provides a cur-
Location
NIST, Gaithersburg, Maryland
NIST, Gaithersburg, Maryland
NIST, Boulder, Colorado
NIST, Boulder, Colorado
NIST, Boulder, Colorado
University of Colorado, Boulder
NCAR, Boulder, Colorado
Microsoft, Redmond, Washington
Datum, San Jose, California
Abovenet, Virginia
Abovenet, New York City
Abovenet, San Jose, California
TrueTime, AOL facility, Sunnyvale, Cali-
fornia
TrueTime, AOL facility, Virginia