E-test-3

Question 1

Define Multiplexing

Answer 1

Process that combines multiple channels or circuits onto one signal or trunk/aggregate for transmission

Question 2

Define Overhead

Answer 2

Overhead is all the information -control, routing and error-checking characters -that is added in addition to user-transmitted data for quality control

Question 3

Define Time Division Multiplexing

Answer 3

Means of obtaining a number of circuits over a single path by dividing the path into a number of time slots and assigning each channel its own intermittently repeated time slot

Question 4

ID the operational configuration in which the Tactical Access Concentrator 300 (TAC-300) can be employed within a communications network

Answer 4

Can only be employed in a point-to-point configuration with other ATM multiplexers

Question 5

ID the maximum number of circuits (port inputs) by type that the TAC-300 can accept

Answer 5

• 8 circuits

- (4 high speed serial and 4 T1s)

Question 6

Define Asynchronous Transfer Mode (ATM)

Answer 6

High bandwidth, low-delay, connection-oriented, switching and multiplexing technique that allows the seamless end-to-end transmission of voice, data and video traffic

Question 7

Define Permanent Virtual Circuit (PVC)

Answer 7

• Static connection between two ATM ports

- Only method used in the Marine Corps

Question 8

Define the purpose of the 4-port High Speed Serial CES Interface Protocol Option Device (IPOD)

Answer 8

• Provides connectivity for four EIA-530A DB-25 interfaces for Constant Bit Rate (CBR) serial connections at rates up to 20 Mbps port port
• Serial services such as VX-900, NIPRNET, SIPRNET circuits will utilize the HS CES IPOD

Question 9

Define the purpose of the Circuit Emulation Quad DS1 Interface Protocol Option Device (IPOD)

Answer 9

• DS1 ports accept input from devices connected with RJ-45 connector terminated cables
• Each port supports up to 1.544 Mbps bandwidth, equivalent of a T1 connection

Question 10

Define the purpose of the Serial ATM Expansion Protocol Option Device (XPOD)

Answer 10

• Serial XPOD, a single ATM high density serial port, is the backbone for all data transferred to and from TAC-300.
• Serial ATM XPOD provides an ATM cell stream over an RS-422/EIA-530 serial interface

Question 11

ID the communications symbol used to represent the TAC-300

Answer 11

TAC-300 6 sided pentagon?

Question 12

Signal Flow:
Packets/Voice > IPOD > CPOD > XPOD > Aggregated ATM cell stream
IPODs receive data/voice
CPOD segments and combines data/voice
XPOD pushes out the multiplexed data
VPI Values = 0-15
VCI Values = 19-2047 (1-18 reserved for management)

Answer 12

.

Question 13

Define Symmetric/Asymmetric Trunk (SA-TRK)

Answer 13

• Medium by which a call leaves the node and enters the network
• Supports efficient transport of one-way and two-way calls between nodes

Question 14

Define network employment configurations available while employing a Promina-based multiplexer

Answer 14

Promina based multiplexer networks can be established in a point-to-multipoint configuration

Question 15

Define the number of T1s that the AN/TTQ-5 Deployable Integrated Transport Suite (DITS) can compress with its standard PrimeVoice Server (PVS-12) cardcomplement

Answer 15

3

Question 16

Define the number of high speed data connections that the AN/TTQ-5 DITS can process with its standard High Speed Data-2B (HSD-2B) cardcomplement

Answer 16

10

Question 17

Define the number of Symmetric/Asymmetric Trunks that the AN-TTQ-5 DITS can process with its standard Primary Rate Card (PRC)complement

Answer 17

6

Question 18

Define the number of Symmetric/Asymmetric Trunks that the AN-TTQ-5 DITS can process with its standard Symmetric/Asymmetric Trunk (SA-TRK) cardcomplement

Answer 18

3

Question 19

ID the appropriate communications symbol used to represent a Promina multiplexing system

Answer 19

8 sided P400DS D_N_

Question 20

PVS-12 - T1 - 3

High Speed Data-2B card 10

Primary Rate Card - SA Trunks 6

Symmetric/Asymmetric Trunk (SA-TRK) - SA trunks - 3

Answer 20

.

Question 21

Define the purpose of Communications Control (COMMCON)

Answer 21

• COMMCON represents command and control of the network
• COMMCON process controls, through decentralized execution, the organization, direction, coordination, planning and employment of communications resources in order to PIOM a communication network responsive to MAGTF operational requirements

Question 22

ID the 3 functional areas comprising COMMCON

Answer 22

• Systems Planning and Engineering (SPE)
• Operational systems control (SYSCON)
• Technical Control (TECHCON)

Question 23

ID the primary function of each of the three functional areas comprising COMMCON

Answer 23

SPE

• Primary function of the MCCC
• Involves current and future operations as well as future plans in order to design, implement and responsively adjust communications networks to satisfy operational requirements

SYSCON

-Serves as the focal point for information regarding the health of the current network, maximizes the effectiveness of communications resources to meet operational demands and remedies deficiencies and outages

TECHCON

-The means of exercising decentralized, technical supervision and direction of the installation, operation and maintenance of communications links, circuits and systems

Question 24

ID how to convert between volt-amperes and watts when operating tactical generators

Answer 24

True Power (Watts) = Apparent Power (Volt-Amperes) x Power Factor

Question 25

ID the types of output phases used in tactical generators

Answer 25

- Single-phase | - Three-phase

Question 26

ID the voltages associated with the two types of output phases used in tactical generators

Answer 26

- Single-phase 120 Volts | - Three-phase 208 Volts

Question 27

ID the benefits of using a 3-phase generator

Answer 27

- A three-phase system is generally more economical than others because it uses less conductor material to transmit electric power vice the equivalent single-phase system at the same voltage - Three-phase power distribution also provides better redundancy than single-phase - Three-phase power is the most common method used by electric power distribution grids world wide to distribute power

Question 28

State the four utilities MOS that directly relate to power planner

Answer 28

- 1141 (Pvt-Sgt) Electrician - 1142 (Pvt-Sgt) Engineer Equipment Electrical Systems Technician (Generator Mechanic) - 1169 (GySgt-MGySgt) Utilities Chief - 1120 (WO-CWO5) Utilities Officer

Question 29

ID the two most common locations to find electrical power requirements for communications equipment

Answer 29

- Read that data plate located on the piece of equipment in question - Check the equipment's technical manual to find electrical ratings

Question 30

ID the metric used to measure power output in tactical generators

Answer 30

Kilowatts (kW)

Question 31

ID the two electrical frequencies (Hz) used in tactical generators

Answer 31

- 50 Hz | - 60 Hz

Question 32

ID the purpose of the Mobile Electric Power Distribution System (MEPDIS)

Answer 32

Provide fast, mobile and safe means of installing an electrical distribution system

Question 33

State how to configure signal and power cables if their paths must cross

Answer 33

- Right angles | - 2 feet of separation

Question 34

State which generators in the USMC are capable of being employed in parallel

Answer 34

All generators rated at 30kW and above

Question 35

State the optimum percent utilization for tactical generators when employed in parallel

Answer 35

Between 30% and 40% (when employed in parallel)