Comtech EF Data CDM-625A Installation And Operation Manual page 44

CDM-625A Advanced Satellite Modem
Introduction
•
It offers variable data rates, from 18 kbps to 25 Mbps, in BPSK, QPSK, Offset QPSK (OQPSK),
8PSK, 8-QAM, 16-QAM, 8-ARY (VFEC-2), 16-ARY (VFEC-2), and 32-ARY (VFEC-2) modes.
•
It supports a complete range of transmit filter options (spectrum shaping). Transmit alphas
of 0.05, 0.10, 0.15 0.20, 0.25 and 0.35 are included, which in turn permits you to reduce
channel spacing as transmit alpha (and hence occupied bandwidth) reduces, providing
potentially significant gains in transponder bandwidth efficiency.
See Appendix S. TRANSMIT SPECTRUM FILTERING OPTIONS for important
information about these new options.
• Its demod design incorporates fast acquisition, optimal composite power handling, and an
integrated adaptive equalizer.
• It includes VersaFEC and VersaFEC-2 Adaptive Coding and Modulation in the base hardware to
increase capacity on IP links.
•
It includes DoubleTalk
separate plug-in card. (However, FAST codes are still required to activate this option.)
•
It can be equipped with an optional IP Packet Processor card that, in addition to providing
Layer 3 functionality, incorporates a number of key features for Wide Area Network (WAN)
bandwidth optimization: very low overhead Streamline Encapsulation (SLE), Header and
Payload Compression, Advanced Quality of Service (QoS), and Advanced Encryption Standard
(AES) Encryption.
•
IEEE-1588v2 Precision Timing Protocol (PTP) and Jumbo Frame Support are available options.
•
It features an internal expansion slot that is available for future FEC options, etc. The new base
hardware includes sufficient FPGA and memory resources to permit Comtech EF Data to
continue to update the capability of the modem as new technologies emerge.
•
A specialized version of the CDM-625A – the CDMER-625A – is also available. In addition to
the features listed previously, this Environmentally Resistant (ER) version of the CDM-625A
offers added protection in more aggressive operating environments that have a higher
concentration of dust, sand and salt. The ER version also provides an extended operating
temperature range of 0° to 60° C.
The ER version uses an application of Urethane Conformal Coating (CC) and critical interface
protective covers for enhanced protection against dust, sand, and salt. Special protective
Conformal Coating and protective covers are used and have been designed to ensure that the
CDMER-625A meets MIL-STD-810G requirements including Method 510 Procedure I (Blowing
Dust), Method 510 Procedure II (Blowing Sand), and Method 509 (Salt Fog). Both the CC and
protective connector covers are fabricated using non-nutrient fungal growth materials.
The ER version is not designed to be used in an uncontrolled environment or outdoor
application.
® ®
Carrier-in-Carrier in the base hardware, and no longer requires a
1–2
MN-CDM625A
Revision 4