Orolia SecureSync 2400 User Manual

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2.15.8 NTP Servers and Peers
SecureSync can be configured to receive time from one or more available NTP Servers
(SecureSyncs or different models). This allows for NTP Servers on a timing network to be
configured as potential (fallback) input time references for SecureSync System Time syn-
chronization. In the event that a current reference becomes unavailable, SecureSync can
fallback to the other NTP Servers available on the network.
A group of NTP servers at the same Stratum level (Stratum 1 time servers, for example)
are considered as NTP Peers to each other.
NTP Servers at the same Stratum level
If SecureSync is configured to obtain time from other NTP Servers at the same Stratum
level (i.e., NTP Peers) but is currently using a different input reference as its selected ref-
erence, SecureSync will report to the network (via the NTP time stamps) that it is a
Stratum1 time server. Should, however, all input references except the other NTP server
(s) become unavailable, SecureSync will then drop to a Stratum2 time server (with Sys-
tem Time being derived from the NTP time packets being received from the other NTP
Peers.
Holdover
If SecureSync is synchronized to another NTP Server or reference, and that server or ref-
erence subsequently loses sync or becomes unavailable (with no other higher priority input
references being present and valid), SecureSync will then go into the Holdover mode. It
will remain in Holdover mode until any enabled and valid input reference becomes available
again, or until the Holdover period expires, whichever occurs first.
During Holdover mode, NTP will remain at the same Stratum level it was before entering
the Holdover mode and can continue to be the reference to the network. However, if no
input reference becomes available before the Holdover period expires, Time Sync will be
lost and shortly thereafter, NTP will report to the network that it is now at Stratum15. A
status of Stratum15 will cause the network to ignore SecureSync as an NTP time ref-
erence.
For more information about Holdover, see "Holdover Mode" on page224.
2.15 Configure NTP
CHAPTER 2 • SecureSync 2400 User Manual Rev. 2
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Orolia SecureSync 2400 Specifications

General

Brand	Orolia
Model	SecureSync 2400
Category	Recording Equipment
Language	English