Flashcards in numbers tech related Deck (93)

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1

## According to the C/N rule, each time the number of amplifiers doubles, the C/N gets worse by how much?

### 3 dB

2

## Per FCC rules, signal leakage between 54 MHz and 216 MHz must not exceed what?

### 20 microvolts per meter at 3 meters

3

## What is the typical bandwidth for C-band service?

### 500 MHz

4

## What frequency range must a spectrum analyzer have in order to align satellite dishes?

### 950 MHz - 1450 MHz

5

## All drop splitters must have a minimum return bandwidth of?

### 5 MHz to 42 MHz

6

## What is the diameter, in microns, of a single mode fiber strand with the coating intact?

### 250 microns

7

## "Four Nines" or 99.99% reliability allows for how many downtime minutes per customer per year? +/- 1 min.

### 52.42

8

## What is the proper depth of modulation percentage of the properly balanced video carrier?

### 87.5

9

## What is the maximum length of a series-6 drop that can be used in an underground installation?

### 150 feet

10

## What is the maximum current output supported by the Vista 20P control panel?

### 600 mA

11

## What is the maximum length for a coax jumper used between a wall plate and the CPE?

### 6 feet

12

## When terminating an unused tap port, what must be included in the terminator?

### Internal 75-ohm resistor

13

## Per FCC rules, signal leakage between 54 Mhz and 216 Mhz must not exceed what?

### 20 microvolts per meter at 3 meters

14

## What is the reference temperature to determine thermal noise level delivered to any load impedance?

### 68 degrees Fahrenheit (293.15 degrees Kelvin)

15

## When making attachments to the strand, what is the minimum distance from the center of the pole that the attachment can be made?

### 30 inches

16

## What is the minimum cable bend radius for series 6?

### 2.5 inch radius

17

## What CLI figure of merit must be met in order to comply with Federal Communications Commission Standards?

### <64

18

## For each dB increase in input optical power (dBm), the RF output increases by how many dBmV?

### 2 dBmV

19

## How much bandwidth is required when both video and audio broadcasts are sent via a satellite in analog format?

### 36 MHz

20

## What is 1 per million as expressed in scientific notation?

### 1.0E-6

21

## What is 1 millivolt equal to across a 75 ohm load?

### 0 dBmV

22

## What is the typical 1550nm fiber loss in dB/km?

### 0.25(+/-.1dB)

23

## When purchasing a fractional PRI, what is the minimum number of channels required per account?

### 6

24

## What is the total bandwidth, to the nearest thousandth, required for a single 24-channel PRI circuit?

### 1.544 Mbps

25

## What resistance is present in a circuit where 1 ampere of current dissipates 1 watt of power?

### 1 ohm

26

## What is the FCC signal leakage limit for frequencies below 54 MHz and above 216 MHz?

### 15 microvolts/meter at 30 meters (100 feet)

27

## What frequency does Comcast use for the MoCA channel?

### 1,150 MHz or 1.15 GHz

28

## What is the minimum PHY rate required between the Media Hub and the terminal?

### 180 Mbps

29

## When is the use of Series-11 or QR-320 permissible for an aerial drop?

### Greater than 150 feet or in situations where it will improve signal levels to within acceptable ranges

30