The CDM-650 Satellite Modem is designed for use by foreign government entities that need a
modem which employs state-of-the-art modulation and coding techniques to optimize satellite
transponder bandwidth usage while retaining backward compatibility with a wide range of
Comtech EF Data modems currently in use. The CDM-650 leverages the heritage and feature
set of our very successful SLM-5650B/C, CDM-625A and CDM-425 modems. The CDM-650
supports backwards compatibility / interoperability in certain modes of operation with the SLM-
5650B/C, CDM-625A and CDM-425 modems.
The CDM-650 offers data rates from 18 kbps to 155 Mbps and symbol rates from 32 ksps to
64 Msps (coding / FEC dependent). The modem supports an Ethernet 10/100/1000T user
traffic data interface that can be used in Bridge mode or Routed mode offering Quality of
Service protocols and traffic shaping / congestion control methods.
Advanced forward error correction (FEC) capabilities are a Comtech EF Data standard feature. Turbo Product Codes (TPC), and three
Low Density Parity Check codes (LDPC) families, VersaFEC?-2 high performance LDPCs short and long block and Direct Sequence
Spread Spectrum (DSSS) are all supported.
Direct sequence spread spectrum is available to support both point-to-point and point-to-multipoint applications as an option in
conjunction with LDPC-based FEC and BPSK. Spreading factors up to 64 are supported. Maximum supported chip rate is 64 Mcps.
Spread spectrum results in operation with ultra-low power spectral densities. This enables use of small antenna apertures when
adjacent satellite interference (ASI) is an important consideration.
The IF interface supports 950 to 2000 MHz frequency ranges.
010-80259830
Fax / 傳真
010-66537763
E-mail / 郵箱 sales@satbase.cn