CDM-570A/570AL Satellite Modem with Optional Packet Processor
Revision 5
Optional Packet Processor - Serial/Telnet CLI Operation 9–17 MN-CDM570A
9.3.2.7 Administration > Managed Switch Multicast Option
If the Working Mode is Managed Switch and Multicast traffic is intended to pass
across a pair of modems, this option must be enabled on both modems.
The Managed Switch Multicast Option allows Multicast to be either transmitted or received
through the modem. This applies to Managed Switch Mode only. Managed Switch Mode will
normally filter Multicast traffic.
9.3.2.8 Administration > Header Compression Refresh Rates
Managed Switch Mode automatically uses L2 Header Compression (even if the
Header Compression option has not been purchased). Because of this, some of
the initial traffic sent between two devices is not received over the satellite until
a full Header is transmitted. For example, the default Header Compression
Refresh Rate is 50 packets. When a ping is sent over the satellite, it times out
until the full Header packet is sent. The Header Compression Refresh Rate on
the Administration page can be reduced to minimize the amount of traffic lost
when traffic is first sent between two devices. Once communication between two
devices has been established, both modems are able to receive all traffic, unless
one modem is power cycled or reset.
The Header Compression Refresh Rates are configured from the Administration page when
Header Compression is Enabled.
The Header Compression Refresh Rates determines how many compressed header packets are
sent before a single full header packet is sent. Some compressed header traffic could be lost
during deteriorated satellite link conditions. Sending a full header packet will allow the return of
the traffic stream.
The Refresh Rate can be decreased for poor satellite link conditions, or increased to further
reduce overhead.
You may select refresh rates, from 1 to 600, individually for UDP/RTP1, UDP, or all other IP
headers.
The default rate of 50 provides the best performance and efficiency for typical satellite links.
9.3.2.9 Administration > Payload Compression Refresh Rate
The Payload Compression Refresh Rates determines how many compressed payload packets
are sent before a single full payload packet is sent. Some compressed payload traffic could be
lost during deteriorated satellite link conditions. Sending a full payload packet will allow the return
of the traffic stream.
You may select a Refresh Rate from 1 to 600. The Refresh Rate can be decreased for poor
satellite link conditions or increased to further reduce overhead.
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