M e r i d i a n I I U s e r M a n u a l
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C H A P T E R T W E L V E
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M e r i d i a n I I 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
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 broadcast4, broadcast6, multicast4, multicast6 or disabled.
It allows IPv4 or IPv6 configuration of either broadcast or multicast mode with selection of the broad-
cast 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 or ff05::101. Multicast may also use
MD5 authentication. If selected, the trusted key number will also be displayed.
Press EDIT to change the broadcast/multicast settings. Each of the edit windows has help infor-
mation available to guide you through the setup process. Note that changing the NTP multicast/
broadcast settings does not take effect until the system reboots. The new parameters are loaded to the
ntp.conf
file in the
/boot/etc/
directory. Only the broadcast line in the
ntp.conf
file is modified. The
final display in the edit sequence requires confirmation of your intent to change the instrument set-
tings. Once confirmation takes place, the instrument will reboot.
PTP Menu (Optional)
The PTP Menu is used for control and status of the PTP/IEEE-1588 option. See
Chapter 9 - PTP/
IEEE-1588
for more information.
Clock Menu
The Clock Menu provides access to the parameters related to timekeeping. These are Time_Mode,
Time_Zone, Hour_Mode, and DST. These displays are all described below.
Clock: Time Mode
Time mode defines the time format used for the front-panel time display and, if installed, the optional
Time Code or Serial Time output. The time mode does not affect the NTP output, which is always
UTC. Possible values for the time mode are GPS, UTC, and Local time. GPS time is derived from
the GPS satellite system. UTC is GPS time minus the current leap second correction. Local time is
UTC plus time zone offset and DST. The time zone and DST displays are described below.
Clock: Time Zone
The time zone is used in calculating the current Local time when the time mode is set to Local (see
time mode above). Press the EDIT key to change the value. Enter a negative offset for time zones
west of the Greenwich meridian, and a positive offset for time zones to the east. If enabled, DST will
add an additional hour.
Summary of Contents for Meridian II
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