Comtech EF Data CDM-570/L Vipersat Parameter Editor - Manual (Page 77)

Chapter 2 - Using Parameter Editor 2-61
Admin
Figure 2-42 Compression dialog
The second check box is for setting compression for Ethernet (L2) traffic. This
parameter is active and is configured on a per modem basis.
When L2 compression is enabled, some of the initial traffic sent between two
devices will not be received over the satellite until a full header is transmitted
(based on the Refresh rate). If a ping is sent over the satellite, it will time out
until the full header packet is sent. The header compression refresh rate can be
reduced to minimize the amount of traffic lost when traffic is first sent between
two devices.
The default refresh values (50 packets) reflect the recommended settings for a
typical modem/router used in a VMS network. However, the refresh rates can
be decreased for poor satellite link conditions, or they can be increased to
reduce overhead even further. The valid range is 1 to 600 packet(s).
Tx Payload Compression
When selecting the Per Route Features options for a route, as described in the
section “Routing” on page 2-7, header compression compresses the IP Header
and the TCP/UDP headers. Only traffic past these headers is effected by
payload compression. Payload is considered everything inside the HDLC satel-