S R A / S F X 2 1 0 0 S E R I E S S A T E L L I T E R E C E I V E R
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The following fields can be edited on the IGMP Edit page:
Edit Field
Description
IGMP Enabled
A check in this field enables or disables IGMP support. If
IGMP is disabled, the receiver outputs all multicast packets.
Robustness Variable
This field is related to the expected packet loss on the
subnet. IGMP is robust to (Robustness Variable – 1) packet
losses. The default value is 2.
Query Interval
This field sets the frequency at which General Queries are
sent out on the LAN, via the Ethernet interface. The default
value is 125 seconds.
Query Response
Interval
This field sets the amount of time a node on the LAN has to
respond to an IGMP query. The default value is 10 seconds.
Last Member Query
Interval
This field sets the maximum response time to a Group-
Specific Query that is sent after a Leave Group Message is
received from a node on the LAN. The default value is 1
second.
Last Member Query
Count
This field sets the number of Group-Specific Queries that are
sent out in response to a Leave Group Message. The
default value is equal to the Robustness Variable value.
Startup Query Interval
This field sets the frequency at which queries are sent out on
startup of a multicast transmission. The default value is ¼
of the Query Interval.
Startup Query Count
This field sets the number of queries sent out on startup,
using the Startup Query Interval. The default value is equal
to the Robustness Variable.
