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HP-UX Internet Services Administrator's Guide (February 2007)

ManualsBrandsHP ManualsSoftwareHP-UX 11i v3 ONC and NFS Software
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Radio Receiver
The radio receiver is the most accurate and expensive time distribution mechanism.
Radio receiver provides a stable time and is not affected by network delays, congestion,
or outrages. Some of the popular radio receiver methods are: GPS (Global Positioning
System), WWV (Terrestrial North America), and DCF77 (Terrestrial Europe).
You must consider the cabling options when you select the radio receiver. Antenna
cables are very expensive and RS232 cabling has a limited range.
The official HP supported GPS receivers are HP58503 driver#26 and Trimble Palisade
driver#29. The only supported WWVB receiver is Spectracom Netclock/2 driver#4.
DCF77 (AM and FM) signals radiate from Frankfurt Germany. DCF77 receivers are
not officially supported by HP.
Setting up an HP58503A GPS Receiver
The following steps describe how to set up an HP58503A GPS:
1. Install and connect the receiver and antenna to a serial port on the HP-UX machine.
2. Append the following entries in the /etc/ntp.conf file:
server 127.127.26.1 minpoll 3 maxpoll 4 # fudge 127.127.26.1 time1 -0.955 #s700
# fudge 127.127.26.1 time1 -0.930 #s800
3. Uncomment the appropriate # fudge entry for your architecture. Uncomment
the #fudge ... #s800 entry for servers or uncomment #fudge ... #s700
entry for workstations.
Setting up a Trimble Palisade GPS Receiver
The following steps describe how to set up a Trimble Palisade GPS receiver:
1. Install and connect the receiver and antenna to a serial port on the HP-UX machine.
2. Append following entries in the /etc/ntp.conf file:
server 127.127.29.1 #poll period is fixed at 32 seconds # no fudge required
# fudge 127.127.26.1 time1 -0.930 #s800
3. Create the following symbolic link:
/usr/bin/ln -s /dev/tty0p0 /dev/palisade1
Setting up a Spectracom Netclock/2
The following steps describe how to set up a Spectracom Netclock/2:
1. Install and connect the WWVB receiver to a serial port on the HP-UX machine.
2. Append the following entries in the /etc/ntp.conf file:
50 Configuring NTP