Comtech EF Data CDM-570A Installation And Operation Manual page 341

Selection
L3/L4/L5 Rx Header
Compression
Tx Payload Compression
Rx Payload Compression
FAST Feature Code 1
FAST Feature Code 2
Vipersat Feature Codes
Vipersat Management
Vipersat File Streamer
Optional Packet Processor - Serial/Telnet CLI Operation
CDM-570A/570AL Satellite Modem with Optional Packet Processor
Hot Key
K Toggle [Enabled] or [Disabled]
This option tells the system to expect received streams to be Header
compressed.
A modem must receive all streams Header compressed or not Header
compressed. The modem has no way to distinguish between
compressed or not compressed. For this reason, when enabling Header
Compression on a live satellite link, you must always first enable the
option on the remote modem.
If a modem has TX Header Compression Enabled, the receiving modem
will not be able to receive any data unless RX Header Compression is
also Enabled.
For example:
Step1. Enable remote modem TX Header Comp (data link will be lost).
Step 2. Enable local modem RX Header Compression (data link will be
restored).
Step 3. Enable remote modem RX Header Comp (data link will be lost).
Step 4. Enable local modem TX Header Compression (data link will be
restored).
C Toggle [Enabled] or [Disabled]
Allows a stream of traffic to be payload compressed. Payload is
considered everything inside the HDLC satellite frame; therefore, IP
headers could be compressed as well.
Note that:
• In Managed Switch Mode, the option is Enabled or Disabled for all
traffic.
• In Router mode, Payload compression displays as Available, and you
must set the option Per Route in Routing table.
[RO] This option is always Available when purchased and activated. It is
auto-sensed by a bit carried in packet headers. Rx Payload Compression
allows a unit receiving a stream of data that has been payload
compressed to be correctly uncompressed.
1 When you purchase a Register 1-specific FAST option, set the FAST
Access Code here to activate your purchase.
2 When you purchase a Register 2-specific FAST option, set the FAST
Access Code here to activate your purchase.
[RO]
Displays the Vipersat features enable code that has been provided by
Comtech Vipersat for the modem configured to operate under VMS
control.
[RO]
VMS v3.x.x VIPERSAT Management System User Guide
(CEFD P/N MN/22156)
[RO]
9–13
Description
MN-CDM570A
Revision 5