Comtech EF Data CDM-625 - FAST Options; Header Compression

CDM-625 Advanced Satellite Modem Revision 13
IP Packet Processor Option MN-CDM625
18–4
18.2.5 FAST Options
• Sect. 5.2.8 SELECT: FAST Menus (Chapter 5. FRONT PANEL OPERATION)
• Appendix C. FAST ACTIVATION PROCEDURE
If there is a need to upgrade the CDM-625 IP Packet Processor’s functionality, Comtech EF Data
provides Fully Accessible System Topology (FAST), a technology that permits the purchase and
installation of options through special authorization codes. These unique Fast Access Codes may
be purchased from Comtech EF Data during normal business hours, and then loaded into the
unit using the front panel keypad.
Contact Comtech EF Data to acquire the following available FAST options:
• Header Compression:
o
Up to 5 Mbps (CCM) / 1200 ksps (ACM)
o
Up to 10 Mbps (CCM) / 4100 ksps (ACM)
o
Up to 15 Mbps (CCM) / 4100 ksps (ACM)
o
Up to 20 Mbps (CCM) / 4100 ksps (ACM)
o
Up to 25 Mbps (CCM) / 4100 ksps (ACM)
• Payload Compression:
o
Up to 5 Mbps (CCM) / 1200 ksps (ACM)
o
Up to 10 Mbps (CCM) / 4100 ksps (ACM)
o
Up to 15 Mbps (CCM) / 4100 ksps (ACM)
o
Up to 20 Mbps (CCM) / 4100 ksps (ACM)
o
Up to 25 Mbps (CCM) / 4100 ksps (ACM)
• Quality of Service
• AES Encryption
18.2.5.1 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.