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P r o d u c t D e s c r i p t i o n
Turbo Product Coding
The Comtech Vipersat CDD-56X incorporates a Turbo Product Codec (TPC)
error correction, delivering significant performance improvement when
compared to Viterbi with concatenated Reed-Solomon. TPC simultaneously
offers increased coding gain, lower decoding delay, and significant bandwidth
savings.
Header Decompression
Header compression reduces the required Voice over Internet Protocol (VoIP)
bandwidth by as much as 60%. Example: a G.729 voice codec operating at 8
kbps will occupy 32 kbps once encapsulated into IP framing on a LAN. Using
IP/UDP/RTP Header Compression, the same traffic only needs 10.8 kbps total
WAN satellite bandwidth to cross the link. The CDD-56X demods perform
header decompression prior to passing the data onto the LAN.
Payload Decompression
Payload compression condenses the size of data frames and reduces the satellite
bandwidth required to transmit across the link. Configurable on a per route
basis, Payload Compression provides traffic optimization and reduces band-
width up to 40%. The CDD-56X demods perform payload decompression prior
to passing the data onto the LAN.
Data Decryption
The CDD-56X decrypts 3xDES data that it receives. Data encryption, config-
urable on a per route basis, is used to prevent unauthorized access to data over
the satellite link.
New in This Release
The following firmware version incorporates a number of additional features
and enhancements.
1.5.4 Release
New DPC (Dynamic Power Control) Enhancements
Higher Order Modulation BER Waterfall Mapping
DPC target E
/N
values are automatically adjusted using the BER waterfall
b
o
curves stored in the modems. The calculations are based on the received VMS
V i p e r s a t C D D - 5 6 X S e r i e s U s e r G u i d e
1-6
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