Unit 1. Standard Maintenance Practices

Question 1

401. Grounding

1. What are the three main functions of grounding?

Answer 1

1 Personnel safety.
2 Equipment protection.
3 Noise reduction.

Question 2

2. What are the four subsystems of the facility ground system?

Answer 2

1 The earth electrode subsystem.
2 Lightning protection subsystem.
3 Fault protection subsystem.
4 The signal reference subsystem.

Question 3

3. What facility ground subsystem is also known as the safety ground?

Answer 3

The fault protection subsystem.

Question 4

402. Bonding

1. What is bonding?

Answer 4

The establishment of a low-impedance path between two metal surfaces.

Question 5

2. To what does the term bond refer?

Answer 5

Both the mechanical interface between the joined conductors and to bonding straps used to interconnect two separate conductors.

Question 6

3. What is the maximum resistance for bonds in the earth electrode subsystem?

Answer 6

It should not exceed a resistance of 1 mΩ.

Question 7

4. What type of bond is not allowed for the lighting and fault protection subsystems?

Answer 7

Soft solder.

Question 8

403. Shielding

1. What are the two standards for shielding effectiveness?

Answer 8

(1) 50 dB for shielded enclosures and global shielding. (2) NSTISSAM/TEMPEST 1-92, Level I for equipment.

Question 9

2. Name at least three less obvious conductive paths for the escape of compromising emanations.

Answer 9

The power lines (and the EMT they run in), extension cords, signal ground wires, alarm signal lines, fire suppression piping, air conditioning and heating ducts, water pipes, building metallic members, and so forth.

Question 10

3. What is considered red equipment?

Answer 10

Equipment that processes clear-text classified information.

Question 11

4. What is considered black equipment?

Answer 11

Equipment that processes encrypted or unclassified information.

Question 12

404. Wire color-coding standards

1. What is the purpose of the binder in a telecommunications cable?

Answer 12

To group by spiraling around a specific number of pairs that replicate in color multiple times throughout a cable.

Question 13

2. What is the color code for the “tip” or “primary” color groups?

Answer 13

White, red, black, yellow, and violet.

Question 14

3. What is the color code for the “ring” or “secondary” cable pairs?

Answer 14

Blue, orange, green, brown, and slate.

Question 15

4. What color would the binder be for pair count 101 –125?

Answer 15

White – slate.

Question 16

5. What are the colors of the two pairs that are reversed in a T568B network crossover cable?

Answer 16

White/orange and orange; white/green and green.

Question 17

405. Inspection standards

1. What are AFCQCCs?

Answer 17

Guides used primarily by QA to help determine equipment condition, maintenance quality, and maintenance management effectiveness.

Question 18

2. Why are there no ATCALS equipment-related AFCQCCs?

Answer 18

ATCALS work centers perform self inspection evaluations using the ATSEP checklist published in accordance with AFI 13–204, Volume 2.

Question 19

3. What are AFCSIs used for?

Answer 19

Provide a means to issue inspection and servicing requirements, operational performance checks, and special maintenance instructions related to standard communications equipment for which formal TO procedures are not published. They may also provide the means to issue optional or temporary modifications on communications equipment.