Key Topic 97: INMARSAT Communications Systems-2

Question 1

3-97P1: What is the best description for the INMARSAT-C system?

A. It provides slow speed telex and voice service.
B. It is a store-and-forward system that provides routine and distress communications.
C. It is a real-time telex system.
D. It provides world-wide coverage.

Answer 1

B. It is a store-and-forward system that provides routine and distress communications.

Question 2

3-97P2: The INMARSAT mini-M system is a:

A. Marine SONAR system.
B. Marine global satellite system.
C. Marine depth finder.
D. Satellite system utilizing spot beams to provide for small craft communications.

Answer 2

D. Satellite system utilizing spot beams to provide for small craft communications.

Question 3

3-97P3: What statement best describes the INMARSAT-B services?

A. Voice at 16 kbps, Fax at 14.4 kbps, and high-speed Data at 64/54.
B. Store and forward high speed data at 36/48 kbps.
C. Voice at 3 kHz, Fax at 9.6 kbps, and Data at 4.8 kbps.
D. Service is available only in areas served by highly directional spot beam antennas.

Answer 3

A. Voice at 16 kbps, Fax at 14.4 kbps, and high-speed Data at 64/54.

Question 4

3-97P4: Which INMARSAT systems offer High Speed Data at 64/54 kbps?

A. C.
B. B and C.
C. Mini-M.
D. B, M4, and Fleet.

Answer 4

D. B, M4, and Fleet.

Question 5

3-97P5: When INMARSAT-B and INMARSAT-C terminals are compared:

A. INMARSAT-C antennas are small and omni-directional, while INMARSAT-B antennas are larger and directional.

B. INMARSAT-B antennas are bulkier but omni-directional, while INMARSAT-C antennas are smaller and parabolic, for aiming at the satellite.

C. INMARSAT-B antennas are parabolic and smaller for higher gain, while INMARSAT-C antennas are larger but omni-directional.

D. INMARSAT-C antennas are smaller but omni-directional, while INMARSAT-B antennas are parabolic for lower gain.

Answer 5

A. INMARSAT-C antennas are small and omni-directional, while INMARSAT-B antennas are larger and directional.

Question 6

3-97P6: What services are provided by the INMARSAT-M service?

A. Data and Fax at 4.8 kbps plus e-mail.
B. Voice at 3 kHz, Fax at 9.6 kbps, and Data at 4.8 kbps.
C. Voice at 6.2 kbps, Data at 2.4 kbps, Fax at 2.4 kbps and e-mail.
D. Data at 4.8 kbps and Fax at 9.6 kbps plus e-mail.

Answer 6

C. Voice at 6.2 kbps, Data at 2.4 kbps, Fax at 2.4 kbps and e-mail.