Comtech EF Data CDM-425, Installation And Operation Manual

Page: 669 / 744

CDM-425 Advanced Satellite Modem
Revision 0
Appendix J J–5 MN-CDM-425
J.2.5.2 Advanced Encryption Standard (AES) Encryption
Chapter 7. ETHERNET-BASED REMOTE PRODUCT MANAGEMENT
•
Sect. 7.5.4.3.3.1 Configuration | Routing | Routes
•
Sect. 7.5.4.3.4 Configuration | Managed Switch
•
Sect. 7.5.4.3.5.3 Configuration | WAN | Encryption
When the AES Encryption option is active and enabled on a WAN route, the IP Packet Processor
will encrypt all outgoing traffic on the WAN, and decrypt any encrypted traffic it receives.
J.2.5.3 Header Compression
The IP Packet Processor incorporates industry-leading header compression for IP traffic. Header
compression can reduce the 40-byte IP/UDP/RTP header to as little as 1 byte; for TCP/IP, the
40-byte header is reduced to as little as 3 bytes.
For applications such as Voice-over-IP (VoIP), header compression can provide bandwidth
savings exceeding 60%. For example, the 8 kbps G.729 voice codec requires 24 kbps of IP
bandwidth once encapsulated into an IP/UDP/RTP datagram. With header compression, the
same voice call needs about 8.5 kbps – a saving of almost 65%.
In addition, bandwidth requirements for typical Web/HTTP traffic can be reduced by 10% or more
with TCP/IP header compression.
J.2.5.4 Payload Compression
The IP Packet Processor features industry-leading payload compression for IP traffic.
Implemented in the hardware for maximum throughput and efficiency, payload compression can
reduce the required satellite bandwidth by as much as 40–50%.