Mocomtech CDM-570 - Manual (Page 319)

CDM-570/570L Satellite Modem with Optional IP Module Revision 4
IP Module - CLI and Telnet Operation MN/CDM570L.IOM
17.2.1.8 easyConnect
™
Multicast Option
The easyConnect
™
Multicast Option allows multicast to be either transmitted or received
through the modem. This applies to easyConnect
™ mode only. easyConnect™ mode will
normally filter multicast traffic.
IMPORTANT
If the Working Mode is easyConnect
™ and multicast traffic is intended to
pass across a pair of modems, this option must be enabled on both modems.
17.2.1.9 Header/Payload Compression Refresh Rate
The Header Compression Refresh Rates are configured from the Administration page.
Menu Options/Fields Entry Description
Header comp refresh rate (in pkts)
for UDP/RTP1 H Selects how often a single, full header
UDP/RTP1 packet is transmitted with Header
Compression enabled.
Header comp refresh rate (in pkts)
for UDP U Selects how often a single, full header UDP
packet is transmitted with Header Compression
enabled.
Header comp refresh rate (in pkts)
for all others O Selects how often a single, full header packet is
transmitted with Header Compression enabled
(for all other types of IP headers).
The Header Compression Refresh Rates determines how many compressed header
packets will be 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. Refresh rates from 1 to 600 can be
individually selected for UDP/RTP1, UDP and all other IP headers. The Refresh Rate can
be decreased for poor satellite link conditions or increased to further reduce overhead.
IMPORTANT
easyConnect
™ mode will automatically use Header Compression (even if
Header Compression option has not been purchased). Because of this, some of
the initial traffic sent between two devices will not be received over the satellite
until a full Header is transmitted. For example, the default Header Compression
Refresh Rate is 50 packets. If a ping is sent over the satellite it will time out until
the full Header packet is sent. The Header Compression Refresh Rate on the
Administration Menu 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 CDM-IP modems will be able to receive all
traffic, unless one CDM-IP is power cycled or reset.
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