Enhanced Bandwidth Efficient Modem. (EBEM) Cryptographic Module. Non- Proprietary Security Policy. Document Number , Rev. ViaSat will provide the Army with MD(U) strategic EBEM and This modem uses advanced modulation and coding technology to. ViaSat Inc. (Nasdaq:VSAT) demonstrated its DISA certified MD Enhanced Bandwidth Efficient Modem (EBEM) to members of the U.S.
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Retrieved from ” https: Unsourced material may be challenged and removed. There are some devices that include only a demodulator and no modulator, thus only allowing data to be downloaded by satellite that are also referred to as “satellite modems.
Together, the features maximize overall network throughput across the satellite link when little or no margin is needed. There are also additional components in the demodulator such as the Intersymbol interference equalizer. Information Throughput Adaptation ITA is a way to keep that built-in safety margin, but use it for enhanced data eem when that margin is not ebbem.
These new capabilities enable you to manage your communications resources and choose whether you maximize data throughput, enable more users to access the network, or decrease networking costs.
After a digital-to-analog conversion in the transmitter the signal passes through a reconstruction filter. However, the fundamental concepts are similar. For well-groomed transponders, PCMA can be of value, but to a lesser degree. Interoperability does not mean that SATCOM users modsm be faced with only a plain vanilla set of choices for their networking, rather that those choices should meet an underlying ability to interoperate with other similar network devices.
High-end modems also incorporate some additional features:. In most cases frequency has to be converted using an upconverter before amplification and transmission.
At the same time, the Department of Defense wants to continue to encourage innovation.
The manner in which a satellite modem converts digital data to analog signals for delivery over the air and then retranslates that data back to a digital format must be the same on each side of a satellite link. Department of Defense telecommunication transmission policy is to simplify its integrated wireless networks.
Digital demodulation implies that a symbol clock and, in most cases, an intermediate frequency generator at the receiving side have to be synchronous with those at the transmitting side. Then the signal is either sampled or processed by the four-quadrant multiplier which produces the complex envelope components I, Q through multiplying it by the heterodyne frequency.
Demonstrations of the modem have shown the value of the new modulation and coding choices. Error correction works by adding an artificial redundancy to a data stream at the transmitting side, and using this redundancy to correct errors caused by noise and interference. Interoperability and an open-standard approach has great advantages, but those responsible for military SATCOM still need to be sure they choose the hardware that delivers the biggest and most efficient data pipe to the warfighter in the field.
VIASAT GETS $4.6 MIL ORDER FOR MD-1366 EBEM MODEMS.
In traditional fixed-channel military satellite communication environments, where a dB link margin is typical, these features can provide nodem than a percent improvement in data throughput.
The input signal for the analog tract is at the intermediate frequency or in the L-bandin the second case it must be firstly converted to IF.
Then its frequency is converted if needed. Error correction techniques are essential for satellite communications, because, due to satellite’s limited power a signal to noise ratio at the receiver is usually rather poor. This page was last edited on 24 Octoberat The main functions of a satellite modem are modulation and demodulation. Generally, a demultiplexer is a device which transforms one multiplexed data stream to several streams which it consists of. This is often referred to as ‘Muxing.
A FEC decoder decodes the Forward error correction code that is used in the specific mosem.
Satellite modem – Wikipedia
Views Read Edit View history. Almost all parts are optional. This module provides a basis for Ethernet interface interoperability amongst satellite modem vendors. List of communications satellite firsts List of communication satellite companies.
This article does not cite any sources. A descrambler restores the original stream from the scrambled one.
Satellite communication standards also define error correction codes and framing formats. The ESEM module, used in conjunction with Information Throughput Adaptation, ramps up the satellite link data rate, and then a feature called Radio Aware Routing advertises that throughput potential to a network router.