Turbo Product Coding; Header Compression; Payload Compression; Quality Of Service - Comtech EF Data Vipersat CDM-570 User Manual

P r o d u c t D e s c r i p t i o n

Turbo Product Coding

The Comtech Vipersat CDM-570/570L incorporates a Turbo Product Codec
(TPC). TPC is a FEC technique that delivers significant performance improve-
ment when compared to Viterbi with concatenated Reed-Solomon. TPC simul-
taneously offers increased coding gain, lower decoding delay, and significant
bandwidth savings.

Header Compression

Configurable on a per route basis, 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.
Normal Web/HTTP traffic can be reduced by an additional 10% via IP/TCP
Header Compression.

Payload Compression

Compressing Payload 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 optimizes traffic and reduces bandwidth up to 40%.

Quality of Service

The CDM-570/570L supports multi-level QoS that minimizes jitter and latency
for real time traffic, provides priority treatment to mission critical applications,
and allows non-critical traffic to use the remaining bandwidth. Three modes are
available: Max/Priority, Min/Max, and Diff Serv.

Data Encryption

The CDM-570/570L provides 3xDES data encryption to prevent unauthorized
access to data over the satellite link. Encryption is configurable on a per route
basis

New in this Release

The following firmware versions incorporate a number of additional features
and enhancements.
V i p e r s a t C D M - 5 7 0 / 5 7 0 L U s e r G u i d e
1-6