Web Interface
to the right of the CANCEL button. If the user does not supply a phone number, this feature
verifies the operation of the modem. Testing a number does not synchronize the NTP dae-
mon to the service.
Preconfigured Phone Numbers
Selecting one of the service providers does two things:
n Enters phone numbers for the dial-up time service in the Dial-Up Time Reference Phone
Number(s) field(s).
n Sets the protocols, time code, and time scale the modem will use to decode the dial-up
time service.
Select one of the following services:
n
ACTS: NIST Automated Computer Time Service (ACTS) in the United States. See
http://tf.nist.gov/service/acts.htm.
n
Disable Echo Delay: ACTS measures the echo delay to calibrate for the propaga-
tion delay of the telephone circuit and equipment in order to achieve accuracies of
approximately 1 or 2 milliseconds. Selecting Disable Echo Delay disables this fea-
ture for ACTS, resulting in lower accuracies.
n
USNO: An ACTS-like service provided by the US Naval Observatory in the United States.
Does not provide delay compensation.
n
JJY: NICT Dial-up standard time service (Telephone JJY) in Japan. See http://jjy.n-
ict.go.jp/time/teljjy/teljjy_p1-e.html.
n
ITU-R: Selecting ITU-R generates the phone number for PTB’s telephone time service in
Germany. If needed, please consult the list of other ITU-R service providers below.
Dial-Up Time Reference Phone Number(s)
Selecting an item under Preconfigured Phone Numbers populates these fields. The user can
also enter phone numbers directly. Use a "." (period) character to insert a pause.
Note: Review this list to ensure that the nearest service, or the service with the lowest
charges, is at the top of the list.
Comments
The services and numbers listed below are subject to change. Please consult with your local
time-keeping authority for the latest information.
Note: Some ITU-R services charge fees. All tolls and fees are the responsibility of the cus-
tomer.
ITU-R services: Services that comply with the ITU-R Recommendation (ITU-R TF583.4)
are now available from the primary timing centres of: Austria, Belgium, Germany, Italy, The
Netherlands, Poland, Portugal, Romania, Spain, Sweden, Switzerland, Turkey, and the
United Kingdom.
This is a partial list of those services:
n
Germany: Physikalisch-Technische Bundesanstalt (PTB)'s timecode service. +49 5 31 51
20 38. http://www.ptb.de/en/org/4/44/_index.htm
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