Microsemi SyncServer S200, User Manual

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NTP Tab
generates the following alarm events: NTP Stratum Change, NTP System Peer Change,
NTP Leap Change.
NTP- Assoc
Use this page to view the status of NTP associations listed on the NTP - Config page.
Also see NTP Associations in the Glossary.
NTP Associations
Remote: The domain name or IP address of the remote end of the NTP association. “Hard-
ware Clock” is the SyncServer's Hardware Clock. In the case of a remote NTP connection,
this will be the IP address of the remote end.
The character in the left margin indicates the mode in which this peer entry is operating:
n
* (asterisk) the association with which the NTP daemon is synchronizing (the system
peer on NTP - Sysinfo ), marked "synchronizing".
n
+ (plus) indicates the SyncServer is symmetric active mode.
n
- (minus) indicates the SyncServer is symmetric passive mode.
n
= (equal) means the SyncServer is in client mode, marked "being polled".
n
^ (caret) indicates that the SyncServer is broadcasting to the remote node, marked
"broadcasting to".
n
~ (tilde) denotes that the remote node is broadcasting to the SyncServer.
Local: The IP address of the SyncServer network port at the local end of the NTP asso-
ciation. For the Hardware Clock it is "127.0.0.1", the IP address of the loopback port.
St: The stratum level of the remote clock in the NTP hierarchy. Lower values are given more
emphasis. For the local Hardware Clock, stratum 0 is a special value that indicates the Hard-
ware Clock it is synchronized by a "timing root" reference such as GPS. Values in the range
of 1 through 15 indicate the number of steps the remote NTP connection is from its timing
root. Stratum 16 is a special value that indicates that the remote connection is not syn-
chronized. The stratum reported by the SyncServer is incremented by one from its syn-
chronizing peer. For example, while synchronized to the Hardware Clock (Stratum 0), the
stratum of the SyncServer is one (Stratum 1).
Poll: The length of the interval (in seconds) with which the SyncServer polls the remote
server, usually starting at 64 seconds and gradually increasing to 1024 seconds. Valid values
range from 16 to 65535, increasing by powers of 2. The polling interval for the Hardware
Clock is fixed at 16 seconds. The user-configured Minimum and Maximum Poll Interval set-
tings on the NTP - Config page limit this interval.
Reach: This is an 8-bit shift register that keeps track of the last 8 attempts to reach the remote
end of the association. New bits are added to the rightmost end of the register (1 for reached
or 0 for unreached) and old bits "fall off" the left hand side. The shift register is represented in
octal. For example, by converting "377" from octal to binary, one gets "11111111", indicating
8 successful polls. For a sequence of eight successful polling attempts on a new association,
the octal value of Reach increases as follows: 1, 3, 7, 17, 37, 77, 177, 377. If the value isn't
one of those just shown, there may be a problem polling the remote end of the association. If
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