EOC Study 3c251 P2
Other part of the ures.
- 1.Stress patterns are used mainly to identify malfunctioning T-1 transmission equipment and
- A.
Improper line voltages
- B.
Inadequately simulated data
- C.
Equipment speed limitations
- D.
Misoptioned network equipment
- 2.For circuits that use binary with B8ZS coding, which stress pattern test for T-1 circuits is useful for stressing the minimum ones density?
- A.
1-in-7
- B.
2-in-8
- C.
3-in-24
- D.
Quasi-random signal source (QRSS)
- 3.In most cases, the signal level for commercial data circuits is between
- A.
0 and -10 dBm0
- B.
-10 and -13 dBm0
- C.
-18 and -22 dBm0
- D.
-20 and -24 dBm0
- 4.Which digital test is categorized as either controlled or uncontrolled?
- A.
All ones
- B.
Frame loss
- C.
Excess zeros
- D.
Timing slips
- 5.During a 45-minute BERT, the number of frame errors for a T-1 superframe circuit should be less than
- A.
7
- B.
15
- C.
21
- D.
30
- 6.When T-1 equipment receives no input signal, what is transmitted to keep the repeaters operating and to maintain timing?
- A.
Nothing
- B.
An all ones pattern
- C.
An all zeros pattern
- D.
A pseudo-random pattern
- 7.Of the four main causes of T-1 impairments, cross talk is an example of
- A.
Data specific
- B.
Faulty equipment
- C.
Improper connections
- D.
Environmental factors
- 8.Which T-1 impairment is sometimes the hardest to isolate?
- A.
A data specific
- B.
Faulty equipment
- C.
Improper connection
- D.
Environmental factor
- 9.On T-1 circuit, dribbling errors are often caused by
- A.
Data specific
- B.
Faulty equipment
- C.
Improper connections
- D.
Environmental factors
- 10.What can result from an impedance mismatch?
- A.
Impulse noise
- B.
High circuit noise
- C.
Envelope delay distortion
- D.
Excessive loss of signal power
- 11.In any given system configuration employing two or more transmission control terminals, how many terminals have full monitoring and control capability?
- A.
One
- B.
Two
- C.
Three
- D.
Four
- 12.The capabilities of a transmission control (TRANCOM) system are a key factor in
- A.
Eliminating hazardous continuous
- B.
Requiring only slave terminals to operate.
- C.
Being able to establish more unmanned sites.
- D.
Removing maintenance support at DII sites
- 13.Which do you not rely on as a fault isolation aid?
- A.
Operational adjustments
- B.
Customer complaints
- C.
Intercommunications
- D.
Test facilities
- 14.Diagrams that are useful in circuit-rerouting and fault-isolation because they show transmission facilities, routing, composition, and capacity describe what type of fault isolation aid?
- A.
Cabling records
- B.
Written procedures
- C.
System/network configuration plans
- D.
Ready reference charts and placards
- 15.Records that are maintained by telephone systems personnel and are useful for fault isolation describe what type of fault isolation aid?
- A.
Written procedures
- B.
System and network plans
- C.
Plant cabling cross reference files
- D.
Ready reference charts and placards
- 16.What is the first thing you do when you find that a single channel of a T-1 is unusable or deteriorated?
- A.
Coordinate the repair or alignment
- B.
Make the appropriate replacement of equipment
- C.
Make the appropriate test to ensure proper operation of the circuit
- D.
Coordinate to transfer service to a spare channel or preempt a lower priority user.
- 17.Where does the transmit output signal of the modem to the distant end station first appear on the patch bay?
- A.
The send equipment jack of the audio patch bay
- B.
The equipment module of the digital patch bay.
- C.
The receive line jack of the audio patch bay.
- D.
The line module of the digital patch bay.
- 18.Where does the output signal of the modem to the router first appear on the patch bay?
- A.
The send equipment jack of the audio patch bay.
- B.
The equipment module of the digital patch bay.
- C.
The receive line jack of the audio patch bay.
- D.
The line module of the digital patch bay.
- 19.Which career field installs and maintains fixed and transportable low-frequency and high-frequency transmitters, receivers, and transceivers?
- A.
Communications cable and antenna systems
- B.
Satellite, wideband and telemetry systems.
- C.
Ground radio communications.
- D.
Telephone systems.
- 20.What device is a combination transmitter/receiver in a single package?
- A.
A transceiver
- B.
A repeater
- C.
A router
- D.
A hub
- 21.What device operates at the Physical layer of the open system interconnection (OSI) model and is used in Ethernet networks to connect which device to a fiber or copper cable?
- A.
A transceiver
- B.
Gateway
- C.
Router
- D.
Switch
- 22.What device provides the physical, electrical, and electronic connections to the network media?
- A.
Bridge
- B.
Router
- C.
Gateway
- D.
Network Interface Card
- 23.What layers of the OSI model do NIC belong?
- A.
Data Link and Network layer
- B.
Physical layer and Network layer
- C.
Physical Layer and Data Link later
- D.
Physical, Data Link, Network layer.
- 24.The device that receives a digital signal and regenerates the signal along the next leg of the medium is a
- A.
Bridge
- B.
Brouter
- C.
Gateway
- D.
Repeater
- 25.A repeater with more than one output port is a
- A.
Hub
- B.
Bridge
- C.
Brouter
- D.
Gateway
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