EndRun Tempus LX GPS, User Manual

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T e m p u s L X G P S U s e r M a n u a l 38
C H A P T E R F I V E
39 T e m p u s L X G P S U s e r M a n u a l
F R O N T - P A N E L K E Y P A D A N D D I S P L A Y
NTP Status
This display provides information associated with the NTP subsystem.
Source - GPS LI Bits - None
NTP STATUS Stratum - 1 Offset - +0.0000007 sec
Stratum: This stratum field has three possible values:
Stratum 1: The server is fully synchronized and accurate.
Stratum 2: The server is synchronized to a stratum 1 server with IP address shown
in Source.
Stratum 16: The server is unsynchronized. NTP clients will not use a Stratum 16
server.
Source: The synchronization source is named here. For the Tempus LX GPS the source is GPS,
IP address of upstream source, or none.
Offset: The NTP offset indicates the accuracy of the NTP system clock relative to the GPS
subsystem clock. Initially, if the offset between the NTP system clock and the GPS
subsystem clock is large the display will indicate “not available”. After the GPS
subsystem locks, the NTP clock will synchronize to the GPS subsystem. Once
synchronization is complete, the typical offsets will range over approximately
+/- 1 microsecond.
LI Bits: Shows the status of the leap indicator bits as sent by the Tempus LX time server to the
clients in the NTP reply packets. Descriptions of the leap indicator are:
00 - None: No fault and no pending leap second.
01 - Insert Pending: No fault and a leap second insertion is pending.
10 - Delete Pending: No fault and a leap second deletion is pending.
11 - Fault: Unsynchronized fault condition exists.
NTP Setup
This display provides access to the NTP broadcast and multicast settings and provides the user with
a convenient means of checking the current configuration and allows limited setup. You may also
perform a more complete broadcast/multicast configuration via a
telnet
or
ssh
session or the local
RS-232 console using the
ntpconfig
utility. This utility provides a more secure means of setup and
so is more complete. It will allow you to select keys and identify trusted keys.
This display will indicate that the mode is broadcast, multicast, or disabled. It allows either broadcast
or multicast configuration with selection of the broadcast address, multicast time-to-live (TTL) and
trusted key for MD5 authentication. The broadcast/multicast mode may also be disabled.
Broadcast Mode In this mode the broadcast address is displayed. If MD5 authentication is
selected the trusted key number will also be displayed.
Multicast Mode The multicast address must be 224.0.1.1. The TTL value is the number of router
hops that multicast traffic is permitted to pass through before expiring on the
network. Multicast may also use MD5 authentication. If selected, the trusted
key number will also be displayed.