Comtech EF Data CDM-IP 300L - Manual (Page 41)

CDM-IP 300L IP-Centric Satellite Modem Rev. 1
CD/CDMIP300L.IOM
13
1.4.1 T
URBO
P
RODUCT
C
ODING
(TPC)
The optional Turbo Product Coding (TPC) is a recent development in FEC techniques
that delivers significant performance improvements when compared to Viterbi with
concatenated Reed-Solomon. TPC simultaneously offers increased coding gain, markedly
lower decoding delay (leading to improved TCP/IP performance), and bandwidth savings
of up to 40%. The TPC option includes two modes (BPSK 22/44 and BPSK 5/16) that
permit operation from exceptionally small antennas where flux density issues are of
concern.
1.4.2 3
X
DES E
NCRYPTION WITH
A
BILITY TO
C
HANGE
K
EYS
The CDM-IP optionally supports 3xDES-128 encryption and decryption, for the highest
level security for link encryption. Each unit supports eight encryption keys and eight
decryption keys. The keys are user configurable. Each route can be assigned to be
encrypted by any of the eight available keys, random key method, or transmitted in clear.