Term
| After you have adjusted the oscilloscope intensity control to increase the readability of the display, what other control may you need to adjust? |
|
Definition
|
|
Term
| What oscilloscope control do you need to adjust when a "halo" appears on the display? |
|
Definition
|
|
Term
| When the spot is elliptical on the oscilloscope screen, what control should you adjust? |
|
Definition
|
|
Term
| What oscilloscope height-to-width ratio provides optimum display proportions for general-purpose waveform examinations? |
|
Definition
|
|
Term
| To center the trace on the cathode-ray tube (CRT) of an oscilloscope, what controls do you use? |
|
Definition
| Horizontal and vertical position controls |
|
|
Term
| What happens to the observed signal if you advance the oscilloscope synchronizing control too far? |
|
Definition
|
|
Term
| What are the two major sections of a bit error rate test (BERT) set? |
|
Definition
|
|
Term
| Which section of a BERT set generates a pseudo-random test pattern? |
|
Definition
|
|
Term
| Which section of a BERT set measures the received test pattern? |
|
Definition
|
|
Term
| What type of framing format should you use to conduct a BERT on a T-1 circuit configured for B8ZS coding? |
|
Definition
|
|
Term
| What determines the size of a test pattern segment? |
|
Definition
| The number of bits that can represent the total number of bits in the test pattern |
|
|
Term
| What type of error is the result of two successive logic one pulses of the same polarity in violation of alternate mark inversion coding rules? |
|
Definition
|
|
Term
| The purpose of a breakout box is to |
|
Definition
| monitor and provide access to multiple conductors |
|
|
Term
| The purpose of the jumper cables and side switch pins on a breakout box is to |
|
Definition
| cross-patch individual interface conductors |
|
|
Term
| At a receiving station, what can be the result of excessive timing jitter? |
|
Definition
| Incorrect signal tracking |
|
|
Term
| During the total peak-to-peak jitter test, the picture displayed on the oscilloscope screen is the |
|
Definition
| composite of the signals during several sweeps |
|
|
Term
| Before starting the timing jitter test, you must determine whether the circuit you are testing is |
|
Definition
|
|
Term
| When you conduct the timing jitter test with an oscilloscope connected to a circuit carrying a signal, what triggers the sweep? |
|
Definition
| The first positive-going transition |
|
|
Term
| Besides amount of errors, what is another critical consideration in measuring bit error rate (BER)? |
|
Definition
|
|
Term
| How many minutes should you conduct a BERT on a Z4, 50kbps circuit? |
|
Definition
|
|
Term
| Which test determines whether the digital radio and multiplexer are operating in an optimum condition? |
|
Definition
|
|
Term
| Which statement best describes the average BER for a digital radio? |
|
Definition
| It is related to the median received RF signal RSL |
|
|
Term
| When determining the relationship of BER versus RSL for a digital radio, the attenuator may cause |
|
Definition
|
|
Term
|
Definition
| predetermined sequence of logical ones and zeros used for testing and fault isolation |
|
|
Term
| Which stress pattern test for T-1 circuits causes the pulse generator of the transmission equipment to consume the maximum amount of power? |
|
Definition
|
|
Term
| Which stress pattern test for T-1 circuits tests the ability of the transmission equipment to send bit sequences containing both minimum ones density and a maximum density of 15 consecutive zeros? |
|
Definition
|
|
Term
| Stress patterns are used mainly to identify malfunctioning T-1 transmission equipment and |
|
Definition
| misoptioned network equipment |
|
|
Term
| For circuits that use B8ZS coding, which stress pattern test for T-1 circuits is useful for stressing the minimum ones density? |
|
Definition
|
|
Term
| In most cases, the signal level for commercial data circuits is between |
|
Definition
|
|
Term
| Which digital test is categorized as either controlled or uncontrolled? |
|
Definition
|
|
Term
| During a 45-minute BERT, the number of frame errors for a T-1 superframe circuit should be less than |
|
Definition
|
|
Term
| When T-1 equipment receives no input signal, what is transmitted to keep the repeaters operating and to maintain timing? |
|
Definition
|
|
Term
| Of the four main causes of T-1 impairments, crosstalk is an example of |
|
Definition
|
|
Term
| Which T-1 impairment is sometimes the hardest to isolate? |
|
Definition
|
|
Term
| On T-1 circuits, dribbling errors are often caused by |
|
Definition
|
|
Term
| What can result from an impedance mismatch? |
|
Definition
| Excessive loss of signal power |
|
|
