B.11 NTP/PTP Server
169
PTP Terms
•
Domain: a collection of one or more PTP subdomains. A subdomain is a logical grouping of 1588
clocks that synchronize to each other using the PTP protocol, but that are not necessarily synchronized
to PTP clocks in another PTP subdomain. Subdomains provide a way of implementing disjoint sets
of clocks, sharing a common network, but maintaining independent synchronization within each set.
•
Announce interval: specifies the time for sending announce messages. The range is from 0 to 4 seconds;
the default is 2 seconds.
•
Sync interval: the time for sending synchronization messages. The range is from -1 to 1 seconds; the
default is 1 second.
•
Delay request interval: specifies the time recommended to the member devices to send delay request
messages when the port is in the master state. The range is -1 second to 6 seconds. The default is 5
(32 seconds).
•
Peer Delay Request: allows the requesting device to calculate the propagation delay for the individual
segment.
•
Announce receipt timeout:
specifies the number of seconds the announce interval has to
pass without receipt of an Announce message before the occurrence of the event,
AN-
NOUNCE RECEIPT TIMEOUT EXPIRE.
•
Delay mechanism: communication delay, end to end or peer to peer.
•
Protocol: UDP IPv4, UDP IPv6 or Layer2.
•
Clock class value: used to advertise the quality level of the clock. A GNSS clock is given the value of
6.
•
Clock accuracy: 22 is used for clock accuracy to within 250 ns.
•
Priority 1: used in the execution of the best master clock algorithm.
•
Priority 2: used in the execution of the best master clock algorithm.
Summary of Contents for 1201B
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