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单选题
Scrambling of SONET signals is done to （）.
A
prevent the leakage of external fiber emissions
B
provide the optical network with the highest level of security possible
C
assure an even distribution of 1's and 0's for extended transmitter life
D
assure an adequate number of transitions for clock recovery at the receiver
E
prevent the receiver from assuming AIS inadvertently when all 0's are received
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更多 “单选题Scrambling of SONET signals is done to （）.A prevent the leakage of external fiber emissionsB provide the optical network with the highest level of security possibleC assure an even distribution of 1's and 0's for extended transmitter lifeD assure an adequate number of transitions for clock recovery at the receiverE prevent the receiver from assuming AIS inadvertently when all 0's are received” 相关考题
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An instruction is made up of operations that(68)the function to be performed and operands that represent the data to be operated on. For example, if an instruction is to perform. the operation of(69)two numbers, it must know(70)the two numbers are. The processor's job is to(71)instructions and operands from memory and to perform. each operation. Having done that, it signals memory to send it(72)instruction.A．smileB．skipC．smokeD．specify
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UPSR protection switching is initiated by (), while BLSR is initiated by ().
A. the K1 SONET byte； the K2 SONET byteB. the K2 SONET byte；the K1 SONET byteC. transmitter switching；receiver detectionD. Line Overhead bytes；Path Overhead bytesE. Path Overhead bytes；Line Overhead bytes
考题
Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS－1 timing source?()
A.DUSB.line timingC.loop timingD.internal timingE.through timing
考题
Scrambling of SONET signals is done to ().
A. prevent the leakage of external fiber emissionsB. provide the optical network with the highest level of security possibleC. assure an even distribution of 1‘s and 0‘s for extended transmitter lifeD. assure an adequate number of transitions for clock recovery at the receiverE. prevent the receiver from assuming AIS inadvertently when all 0‘s are received
考题
Which statement concerning locating signals in the GMDSS is FALSE ________．A.Locating signals are transmitted by survival craft VHF transceiversB.Locating signals are transmitted by SARTsC.Locating signals are intended to facilitate the finding of a distressed vessel or its survivorsD.Locating signals are not transmitted by autoalarm generators
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What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.)A、It protects signals against node failures between rings.B、It protects signals against node failure within a single ring.C、It allows for traffic to be preempted when a ring switch occurs.D、Traffic can be dropped and continued at interconnecting nodes.E、It protects preemptible traffic from being dropped when a ring switch occurs.
考题
Scrambling of SONET signals is done to （）.A、prevent the leakage of external fiber emissionsB、provide the optical network with the highest level of security possibleC、assure an even distribution of 1's and 0's for extended transmitter lifeD、assure an adequate number of transitions for clock recovery at the receiverE、prevent the receiver from assuming AIS inadvertently when all 0's are received
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On an ONS 15454 node you can tunnel a（n） （）.A、 SDH circuit over a SONET network delivering it as an SDH signalB、 SDH circuit over a SONET network delivering it as a SONET signalC、 SONET circuit over an SDH network delivering it as an SDH signalD、 SONET circuit over an SDH network delivering it as a SONET signal
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UPSR protection switching is initiated by （）, while BLSR is initiated by （）.A、the K1 SONET byte； the K2 SONET byteB、the K2 SONET byte；the K1 SONET byteC、transmitter switching；receiver detectionD、Line Overhead bytes；Path Overhead bytesE、Path Overhead bytes；Line Overhead bytes
考题
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What is the difference between a CSU/DSU and a modem?（）A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineB、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineC、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineD、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
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On an ONS 15454 node you can tunnel an （）.A、SDH circuit over a SONET network delivering it as an SDH signalB、SDH circuit over a SONET network delivering it as a SONET signalC、SONET circuit over an SDH network delivering it as an SDH signalD、SONET circuit over an SDH network delivering it as a SONET signal
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What is the difference between a CSU/DSU and a modem?（）A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.C、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
考题
Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）A、DUSB、line timingC、loop timingD、internal timingE、through timing
考题
单选题On an ONS 15454 node you can tunnel a（n） （）.A
SDH circuit over a SONET network delivering it as an SDH signalB
SDH circuit over a SONET network delivering it as a SONET signalC
SONET circuit over an SDH network delivering it as an SDH signalD
SONET circuit over an SDH network delivering it as a SONET signal
考题
多选题What are two characteristics of dual-ring interconnect in SONET networks? （）(Choose two.)AIt protects signals against node failures between rings.BIt protects signals against node failure within a single ring.CIt allows for traffic to be preempted when a ring switch occurs.DTraffic can be dropped and continued at interconnecting nodes.EIt protects preemptible traffic from being dropped when a ring switch occurs.
考题
单选题Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）A
DUSB
line timingC
loop timingD
internal timingE
through timing
考题
单选题What is the difference between a CSU/DSU and a modem?（）A
A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineB
A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineC
A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineD
A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
考题
单选题UPSR protection switching is initiated by （）, while BLSR is initiated by （）.A
the K1 SONET byte； the K2 SONET byteB
the K2 SONET byte；the K1 SONET byteC
transmitter switching；receiver detectionD
Line Overhead bytes；Path Overhead bytesE
Path Overhead bytes；Line Overhead bytes
考题
单选题On an ONS 15454 node you can tunnel an （）.A
SDH circuit over a SONET network delivering it as an SDH signalB
SDH circuit over a SONET network delivering it as a SONET signalC
SONET circuit over an SDH network delivering it as an SDH signalD
SONET circuit over an SDH network delivering it as a SONET signal
考题
单选题Scrambling of SONET signals is done to （）.A
prevent the leakage of external fiber emissionsB
provide the optical network with the highest level of security possibleC
assure an even distribution of 1's and 0's for extended transmitter lifeD
assure an adequate number of transitions for clock recovery at the receiverE
prevent the receiver from assuming AIS inadvertently when all 0's are received
考题
单选题What is the difference between a CSU/DSU and a modem？（）A
A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B
A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.C
A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D
A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
考题
单选题Which statement concerning locating signals in the GMDSS is FALSE（）.A
Locating signals are transmitted by survival craft VHF transceiversB
Locating signals are transmitted by SARTsC
Locating signals are intended to facilitate the finding of a distressed vessel or its survivorsD
Locating signals are not transmitted by autoalarm generators
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