Symmetricom ND-CLK User Manual page 22

[Note: While listening to NTP broadcasts, the network clock cannot query the time server.]
[Note: Some NTP/SNTP clients will expect NTP servers to operate on port 123 and cannot be
configured to utilize alternate ports.]
Listen for NTP via Multicast Address
The network clock can be set up to listen to NTP using multicast addressing by selecting the
"Listen for NTP via multicast address(es)" checkbox.
When enabled, the multicast class D / group address may be specified as well as the frequency that
multicast broadcasts will be issued. This can be changed as desired. The network clock can listen
for NTP multicast broadcasts using the full class D/ group address range. The network clock does
not restrict the use of the multicast address assignment and supports the full range of class D
multicast addresses or groups from 224.0.0.0 to 239.255.255.255 . These groups or class D
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ND-CLK User Manual- Rev 1.0.1 - Sep-08 Symmetricom , Inc