Login or Register for FREE!
Subelement J

MF-HF Equip. and Comms:

Section 87

MF-HF SITOR (NBDP) - Definitions:

What is meant by describing a Coast Station with the acronym ATOR?

  • The station's BFEC operations are computerized and a rigid operating sequence must be followed correctly.
  • The station will control all of the ARQ operations and it will generate the proper service request codes at the correct time in the sequence.
  • Correct Answer
    The station's ARQ operations are computerized and a rigid operating sequence must be followed correctly.
  • The station will control all of the ARQ operations and it will provide prompts for the operator to request time & charges at the correct time in the sequence.

(C). What is meant by describing a Coast Station with the acronym ATOR the station's ARQ operations are computerized and a rigid operating sequence must be followed correctly.

ATOR is the Automated Telex Over the Radio.
TOR part of ATOR is the telex-on-radio. It has error-corrected retransmitting time-division multiplexing of radio channels, or ARQ. The ARQ or Automatic Repeat Request was designed to control errors in transmission of data, using either acknowledgement or negative acknowledgement and request for retransmission.

Good article about TELEX from Wikipedia TELEX and article on ARQ Automatic Repeat ReQuest

Last edited by markadlerdallas. Register to edit

Tags: none

Which of the following acronyms refers to a communications system that does not use ARQ and/or FEC modes?

  • NAVTEX
  • SITOR (NBDP)
  • HF MSI
  • Correct Answer
    SART

(D). SART does not use ARQ or FEC modes.
(error correction)

A self-contained radio device, Search And Rescue radar Transponders (SARTs) are used by the GMDSS for locating ships in distress and survival crafts by sending position information.

Since, it simply sends info, there is no need for either error retransmission request or forward error correction as it sends and does not receive or communicates otherwise.

Battery powered, it is an omni–directional radar receiver and transmitter. It works in the 9 GHz (3 cm or ‘X-band’) radar frequency band. It is activated automatically or manually. on receiving a signal from a ship or aircraft radar, transmits a series of response (homing) signals.

Last edited by markadlerdallas. Register to edit

Tags: none

What does the term FEC mean in SITOR (NBDP) communications?

  • Correct Answer
    Forward Error Correction
  • Field Effect Correction
  • Forward Error Check
  • Forward Error Character

(A). The term FEC mean in SITOR (NBDP) communications means Forward Error Correction.

Forward error correction (FEC) provides error control in data transmission in which the sender transmits additional data and the receiver identifies just the data with no errors. As there is no handshaking involved, it just broadcasts data.

A good Wikipedia article on Error Correction Forward Error Correction

Last edited by markadlerdallas. Register to edit

Tags: none

A Coast Station that is described as ATOR typically provides what type of services?

  • NAVTEX BFEC weather broadcasts.
  • Correct Answer
    ARQ SITOR (NBDP) connections to shoreside terminals.
  • BFEC SITOR (NBDP) connections to shoreside terminals.
  • SITOR (NBDP) HF weather broadcasts.
This question does not yet have an explanation! Register to add one

Tags: none

The acronym SITOR (NBDP) stands for:

  • Simplified Telephony Over Radio
  • Correct Answer
    Simplex TELEX Over Radio
  • Simplified TELEX Over Radio
  • Simplex Telephony Over Radio
This question does not yet have an explanation! Register to add one

Tags: none

What does the term "ARQ" mean in SITOR (NBDP) operations?

  • Automation Repeat Request
  • Automaton Repeat Request
  • Correct Answer
    Automatic Repeat Request
  • Automatic Request Repeat
This question does not yet have an explanation! Register to add one

Tags: none

Go to 86 Go to 88