120 XLi IEEE 1588 Clock
997-01510-03, Rev. C, 12/12/2006
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The IEEE 1588 card (PTP master) located in Option Bay 4 has the following network settings:
• IP address: 010.048.000.103
• Subnet mask: 255.255.000.000
• Gateway: 010.024.000.001
For units that have two IEEE 1588 cards, the second card (PTP slave) is located in Option Bay 2 has the
following network settings:
• IP address: 010.048.000.105
• Subnet mask: 255.255.000.000
• Gateway: 010.024.000.001
Reconfigure these settings as needed for the 1588 port to operate on the timing network.
The user can reconfigure the static IP settings while DHCP is enabled. The instrument only uses the
static IP settings if DHCP is disabled, or if DHCP is enabled but the 1588 network port hasn’t received
DHCP-assigned settings.
DHCP enabled/disabled
If DHCP is enabled, the IEEE 1588 card automatically obtains IP configuration settings from a DHCP
server on the network. The default factory setting is “enabled”. The DHCP-assigned settings take
precedence over the static IP address settings. The command line interface and keypad display
interface show the DHCP-assigned IP address, subnet, and gateway separately from the static settings.
Note: Enabling DHCP reboots the XLi IEEE 1588 Clock.
DHCP-assigned IP address, subnet mask and default gateway for the network port
The command line and keypad display interfaces display the DHCP-assigned IP address information
separately from the static IP address information. The web interface does not display the DHCP-
assigned IP address information.
Since DHCP is enabled in the factory default settings, if a DHCP server is available from the IEEE 1588
network port, the DHCP-assigned IP address values should be available on the command line and
keypad display interfaces.
PTP Sync message interval
The PTP sync message interval setting determines the length of time between Sync messages multicast
by the PTP master to the PTP slaves. Shorter synchronization intervals improve the timing accuracy of
PTP slaves. Set the PTP Sync message interval to the same value on PTP masters and slaves. The
default factory setting is “2 seconds”.
IMPORTANT: If one of the PTP slaves on the timing network is a Symmetricom IEEE 1588 card,
the interval for all PTP masters and PTP slaves must be set to 2 SECONDS.