Basic System Configuration Guide System Management
Edition: 01 3HE 11010 AAAC TQZZA 199
6.1.2.2 NTP
NTP is the Network Time Protocol defined in RFC 1305, Network Time Protocol
(Version 3) Specification, Implementation and Analysis and RFC 5905, Network
Time Protocol Version 4: Protocol and Algorithms Specification. It allows for the
participating network nodes to keep time more accurately and maintain time in a
more synchronized fashion among all participating network nodes.
NTP uses stratum levels to define the number of hops from a reference clock. The
reference clock is considered to be a Stratum-0 device that is assumed to be
accurate with little or no delay. Stratum-0 servers cannot be used in a network.
However, they can be directly connected to devices that operate as Stratum-1
servers. A Stratum-1 server is an NTP server with a directly connected device that
provides Coordinated Universal Time (UTC), such as a GNSS or atomic clock. The
7705 SAR typically acts as a Stratum-2 device because a network connection to an
NTP server is required.
The higher stratum levels are separated from the Stratum-1 server over a network
path; thus a Stratum-2 server receives its time over a network link from a Stratum-1
server. A Stratum-3 server receives its time over a network link from a Stratum-2
server.
The following NTP elements are supported:
PT Pacific Time Either as PST or PDT, depending on place
and time of year
HST Hawaiian Standard Time UTC -10
AKST Alaska Standard Time UTC -9
AKDT Alaska Standard Daylight
Saving Time
UTC -8
Australia:
AWST Western Standard Time UTC +8
ACST Central Standard Time UTC +9.5
AEST Eastern Standard/Summer
Time
UTC +10
Table 23 System-defined Time Zones (Continued)
Acronym Time Zone Name UTC Offset
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