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
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
相关考题：
An instruction is made up of operations that (1) 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 (2) two numbers，it must know (3) the two numbers are. The processor's job is to.(4) instructions and operands from memory and to perform. each operation. Having done that, it signals memory to send it (5) instruction.A．skipB．smileC．smokeD．specify
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
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
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
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
下面属于5GNR下行链路reference-signal的是（）A、Demodulation-reference-signals-for-PDSCHB、Phase-tracking-reference-signals-for-PDSCHC、Demodulation-reference-signals-for-PDCCHD、Demodulation-reference-signals-for-PBCHE、CSIreference-signals
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.
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
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
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
POS（PacketOverSONET/SDH，SONET/SDH上的分组）将长度固定的数据包直接映射进SONET同步载荷中，使用SONET物理层传输标准，提供了一种高速、可靠、点到点的数据连接。
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
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
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.
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
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
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.
单选题Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）ADUSBline timingCloop timingDinternal timingEthrough timing
单选题What is the difference between a CSU/DSU and a modem?（）AA CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineBA CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineCA CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineDA CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
单选题UPSR protection switching is initiated by （）, while BLSR is initiated by （）.Athe K1 SONET byte； the K2 SONET byteBthe K2 SONET byte；the K1 SONET byteCtransmitter switching；receiver detectionDLine Overhead bytes；Path Overhead bytesEPath Overhead bytes；Line Overhead bytes
单选题On an ONS 15454 node you can tunnel an （）.ASDH circuit over a SONET network delivering it as an SDH signalBSDH circuit over a SONET network delivering it as a SONET signalCSONET circuit over an SDH network delivering it as an SDH signalDSONET circuit over an SDH network delivering it as a SONET signal
单选题Scrambling of SONET signals is done to （）.Aprevent the leakage of external fiber emissionsBprovide the optical network with the highest level of security possibleCassure an even distribution of 1's and 0's for extended transmitter lifeDassure an adequate number of transitions for clock recovery at the receiverEprevent the receiver from assuming AIS inadvertently when all 0's are received
单选题What is the difference between a CSU/DSU and a modem？（）AA CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.BA CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.CA CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.DA CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
单选题Which statement concerning locating signals in the GMDSS is FALSE（）.ALocating signals are transmitted by survival craft VHF transceiversBLocating signals are transmitted by SARTsCLocating signals are intended to facilitate the finding of a distressed vessel or its survivorsDLocating signals are not transmitted by autoalarm generators