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53 Cards in this Set
- Front
- Back
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The purpose of the UHF satellite communications (SATCOM) system:
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To allow the Navy to transmit and/or receive both data and voice communications in the UHF frequency range in all military environments.
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Benefits of the UHF Satellite Communications (SATCOM) System
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- Reliability
- Global coverage - Security - Global coverage - Ally communication - Flexibility - Cost effectiveness - DAMA capability |
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The UHF satellite communications system operates in the frequency range from___________ and currently supports______________ duplex operations
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- 300MHz to 3 GHz
- Half |
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Each UHF Follow-on (UFO) satellite is capable of providing_______ UHF channels, including 21 _________
channels and 1 Fleet broadcast channel. |
- 39
- 21 |
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Characteristics as DAMA
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- Most commonly used UHF SATCOM configuration
- Uses a multiplexer - Multiple users per channel - |
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Characteristics as Non-DAMA
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- Used as a backup when the other is not available.
- Operates without a multiplexer - Single user per channel |
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Limitations of the UHF Satellite Communications (SATCOM) System
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- Line of Sight requirement
- Low capacity - Low anti-jam capacity - Vulnerability to nuclear radiation |
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Operational capabilities of the UHF SATCOM System
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transmitting and/or receiving both voice and data communications in the UHF frequency range
(240-270 MHz downlink and 292-317 MHz uplink) |
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Duality
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Each antenna is mounted in separate locations on opposite ends of the ship.
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Reciprocity
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The same antenna can receive and transmit signals.
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Uninterrupted Satellite Communication
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Two antennas in separate locations work in conjunction to track a satellite. When one antenna is blocked, the other antenna can accommodate.
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Operational characteristics of UHF SATCOM Antennas
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- Small size
- High location - Duality |
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Functional characteristics of UHF SATCOM Antennas
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- Satellite tracking
- Reciprocity - Uninterrupted satellite communication |
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Major differences between the OE-82 and the OE-570 Antennas
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- Size
- Shape - Degree of rotation - Manual versus automatic satellite elevation tracking |
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The definition of waveform
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The shape of the wave plus the act of modulating the wave, plus the equipment used to move that waveform to create communications
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Describe the importance of waveforms in UHF SATCOM
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Waveforms allow channels to be interoperable. Waveform governs how many users or networks can use a single satellite channel. In Naval communications, there are two waveforms in use
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Parameters of the 25 kHz waveform
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- Supports voice and data communications
- Supports up to 23 voice and data users at a time without interfering with each other - Supports a larger number of available data rates: Baseband equipment input or output data rates of 75, 300, 600, 1200, 2400, 4800, or 16,000 bps Baseband data transmission rate on the satellite link of 2400, 9600, 19,200, or 32,000 bps - Higher bandwidth than 5 kHz channels - Requires an NCS that receives SARs, determines satellite access availability, and distributes satellite access assignments |
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Parameters of the 5 kHz waveform
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- Provides a simplex message service where one user may transmit short data to one or more users
- Designed primarily to support multiple user, 75 to 2400 bps secure data and voice communications - Uses the 5 kHz bandwidth non-processed channels available on FLTSAT and UFO satellites - Provides message services with automated error detection, error correction, and retry capabilities for efficient handling of short C2 - Point-to-point, multiple-hop circuit communications capability |
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One distinction that describes the difference between the Integrated Waveform (IW) and previously used waveforms
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IW allows the user to switch between voice and data without reestablishing a call.
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Characteristics of waveforms
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- The quantity and type of timeslots in a frame define the waveform
- In the 5 kHz waveform, timeslots may vary in length - Virtually all 25 kHz Demand Assigned Multiple Access (DAMA) operations will be in Automatic Control (AC) mode |
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The _____ is the only equipment in which a waveform is configured once a channel has been set up
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AN/USC-61(C) Digital Modular Radio (DMR) System
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The TD-1271 Multiplexer channel uses the MIL-STD-188-183A for the _____ waveform
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25 kHz
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Timeslots contain:
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Vital information for ensuring communications are successful and that communications resources are used efficiently
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Characteristics of Non-DAMA
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- One user per satellite channel
- Primarily used as a backup to DAMA configuration - Circuit does not get multiplexed with other DAMA circuits |
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The purpose of the UHF Non-DAMA SATCOM System circuit
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to serve as a backup for DAMA circuits when DAMA is not working properly or when equipment is limited and cannot be used with DAMA
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The ultra high frequency (UHF) Non-Demand Assigned Multiple Access (DAMA) Satellite Communications (SATCOM) System circuit has the following capabilities: it operates in the UHF frequency, it supports voice and data communications, and it is a _____ circuit
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Half-duplex
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During the receive signal flow in the ultra high frequency (UHF) Non-Demand Assigned Multiple Access (DAMA) Satellite High Command (SATHICOM) secure voice circuit, the Red unencrypted AF enters the OE-82C Antenna and ends at the TD-1271 Multiplexer as RF
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RF
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During the transmit signal flow in the ultra high frequency (UHF) Non-Demand Assigned Multiple Access (DAMA) TD-1271 Satellite High Command (SATHICOM) secure voice circuit, the signal enters the OE-82C Antenna as an unencrypted AF and flows through the circuit to end at the Navy Order Wire (NOW) computer.
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False
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Which resources are required to set up the UHF Non-DAMA Satellite Communications (SATCOM) System circuit?
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- Communications (COMM) Status Board
- Standard operating procedure (SOP) - Communications Plan (COMMPLAN) |
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The key steps in the process to configure the AN/WSC-3(V)17 Transceiver are: set the front panel switches, assess and set the _____ switches, secure the Radio Transceiver (RT) unit, and set the remaining front panel switches
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Internal
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The key steps in the process to configure the SA-2112(V)3 Secure Audio Switch (SAS) for the UHF Non-DAMA Satellite Communications (SATCOM) System circuit are to program the _____, _____, and trunk numbers.
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Line, channel
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A Sailor conducts a COMM Check, and it is unsuccessful. Which of the following are common errors that may prevent successful communications?
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Patching errors
KYV-5 setup errors Entry errors |
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What is the purpose of the ultra high frequency (UHF) Demand Assigned Multiple Access (DAMA) TD-1271 Satellite Communication (SATCOM) System?
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Provide time division multiplexing to achieve 25 kHz DAMA operations
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What are the benefits of the ultra high frequency (UHF) Demand Assigned Multiple Access (DAMA) TD-1271 Satellite Communications (SATCOM) System?
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- Increases capacity per 25 kHz DAMA satellite channel
- Allows time slots to be used efficiently - Increases the number of transmissions taking place in the radio spectrum at the same time |
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DAMA TD-1271 can connect up to ______ circuits. DAMA TD-1271 is capable of transmitting and receiving data at rates between _______ and ________ bps
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- FOUR
- 75 - 16,000 |
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What circuits use the ultra high frequency (UHF) Demand Assigned Multiple Access (DAMA) TD-1271 Satellite Communications (SATCOM) System?
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- SATHICOM
- CUDIXS |
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The _____, _____, and _____ are all resources required to set up the Ultra High Frequency (UHF) Demand Assigned Multiple Access (DAMA) TD-1271 Satellite Communications (SATCOM) System circuit
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COMMPLAN,
COMM Status Board, SOP |
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Steps that explain how to set up the AN/WSC-3(V)15 Transceiver in the Ultra High Frequency (UHF) Demand Assigned Multiple Access (DAMA) TD-1271 Common User Digital Information Exchange Subsystem (CUDIXS) circuit
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1. Set the front panel switches
2. Access the internal switches 3. Set the internal switches 4. Secure the front panel and set the remaining switches |
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Steps to set up the TD-1271 Multiplexer for the Ultra High Frequency (UHF) Demand Assigned Multiple Access (DAMA) TD-1271 Common User Digital Information Exchange Subsystem (CUDIXS) circuit
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1. Verify that the TD-1271 has been acknowledged by the DAMA net
2. Configure the Circuit Identification Number (CIN) to a port 3. Verify the CIN is in the port and connect to a port 4. Release the I/O port from front panel control 5. Load KEYMAT into the internal crypto device (KGV-11 Cryptographic Equipment) |
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To test if the UHF DAMA TD-1271 CUDIXS circuit is performing once set up; the operator will perform a _____. This test uses a/n ________ link for the check. It is done by sending a message and waiting for a response that has the number _____ attached to it.
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COMM CHECK
OTO 5 |
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Combines multiple signals into a single signal for transmission in order to increase the numbers of users accessing a single satellite channel at the same time
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Multiplexing
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Combines signals together in time slots
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Time Division Multiple Access (TDMA)
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Signals are combined together as a single frequency and transmitted at the same time
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Frequency Division Multiple Access (FDMA)
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When multiplexed signals are broken out so each signal can be read
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Demultiplexing
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Multiplexing equipment is used to _____.
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- Multiplex communications signals
- Demultiplex communications signals - Increase the number of users on a single satellite channel |
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The KGV MODE SELECT Switch is used to
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Control KGV-11 cryptographic equipment functions
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The purpose of the KGV-11 Cryptographic Equipment
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The encryption and decryption of data transmitted and received via the TD-1271 Multiplexer. The KGV-11 is installed inside the TD-1271, which supplies it with power and data. The controls for the KGV-11 are located on the TD-1271 front panel.
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The TRANSMIT NORMAL/INHIBIT Toggle Switch controls
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How the signal is output from the TD-1271 Multiplexer to the transceiver equipment.
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The Call Progress Indicators
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Display information about the connection to the satellite channel.
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The Equipment Status Indicators are used to _____.
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Provide information about the TD-1271 and calls not currently connected
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The Alphanumeric Display is where port and satellite channel information is displayed
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True
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The ALARM Indicators _____.
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Blink on and off during normal operation
Remain continuously lit when there is a failure in the TD-1271 Remain continuously lit when there is a failure in the KGV-11 |
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The Keypad and ENTER Pushbutton are used to load cryptographic information in the KGV-11
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False
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