CiM-550 IP Enabled Satellite Modem

Rev. 2

Introduction

CD/CIM550.IOM

1.4OPTIONS

Enhancing the CiM-550’s performance is easy. Additional features can be added quickly on site, using the FAST access code purchased from Comtech EF Data. To enable these features, simply enter the code at the front panel.

Description

Software Version

Turbo Product Coding (TPC)

1.0.1 and Later

 

 

TCP acceleration

Future

 

 

DES Data Encryption

1.0.1 and Later

 

 

IP Datagram Compression

Future

 

 

IP Header Compression

Future

 

 

Quality of Service (QoS)

1.0.1 and Later

 

 

Network Address Translation (NAT)

Future

 

 

EasyConnectfor non-IP traffic

Future

 

 

IGMP support for multicast

1.0.1 and Later

 

 

1:1 Redundancy with CRS-100

1.0.1 and Later

 

 

1.4.1TURBO PRODUCT CODING (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.

1.4.2TCP ACCELERATION

To compensate for the TCP performance degradation in a high delay and high BER (Bit Error Rate) environment, the CiM-550 incorporates an optional proprietary transparent TCP acceleration mechanism that will allow a TCP session to optimally use the available link capacity, while preserving end-to-end transport reliability. TCP acceleration will be subject to user configured Quality of Service (QoS) restrictions for the route.

1.4.3DES ENCRYPTION WITH ABILITY TO CHANGE KEYS

The CiM-550 optionally supports DES-56 encryption and decryption. Each unit supports 2 encryption keys and 2 decryption keys. The keys are user configurable. Each route can be assigned to be encrypted by key 1 or key 2 or transmitted in clear.

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