Comtech EF Data CDM-570A - Manual (Page 311)

CDM-570A/570AL Satellite Modem with Optional Packet Processor MN-CDM570A
Optional Packet Processor - Serial/Telnet CLI Operation Revision 2
9–15
Selection Hot Key Description
L3/L4/L5 Rx Header
Compression
K 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).
Tx Payload Compression C 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.
Rx Payload Compression [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.
FAST Feature Code 1 1 When you purchase a Register 1-specific FAST option, set the FAST
Access Code here to activate your purchase.
FAST Feature Code 2 2 When you purchase a Register 2-specific FAST option, set the FAST
Access Code here to activate your purchase.
Vipersat Feature Codes [RO] Displays the Vipersat features enable code that has been provided by
Comtech Vipersat for the modem configured to operate under VMS
control.
Vipersat Management [RO]
VMS v3.x.x VIPERSAT Management System User Guide
(CEFD P/N MN/22156) Vipersat File Streamer [RO]