單項(xiàng)選擇題What protection method is used in 4F BLSR networks?()

A. Each fiber has half of its SONET capacity reserved for protection.
B. Two fibers in the span carry working traffic, while the other two fibers in the span are reserved for protection.
C. The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.
D. The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.


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1.單項(xiàng)選擇題Which is a legitimate bandwidth matched pair?()

A. DS-1; E1
B. DS-1; STM-1
C. OC-3; STM-1
D. STS-1; STM-1
E. OC-192; STM-192

3.單項(xiàng)選擇題Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?()

A.DUS
B.line timing
C.loop timing
D.internal timing
E.through timing

5.單項(xiàng)選擇題SONET Code Violations (CVs) totals in the PM tables are actually an accumulation of the number of ().

A. J0 errors detected in a specified interval
B. errors detected in a given Errored Second (ES)
C. errors detected in a given Severely Errored Second (SES)
D. errors the encryption algorithm detects in a specified interval
E. Bit Interleaved Parity (BIP) errors detected in a specified interval

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What is the phenomenon called where different wavelengths of light travel at different speeds?()

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What protection method is used in 4F BLSR networks?()

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Click the Exhibit button. Given the following parameters: transmitter output (min): -2 dBm receiver input (min): -28 dBm 15216 Mux and Demux loss: 4.5 dB 16 channels maximum In which sites shown in the exhibit could the 15216 EDFAs be placed to minimize the number of EDFAs needed?()

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How is UPSR and BLSR traffic rerouted during a protection switch when a complete fiber cable cut occurs?()

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Given the formula: (Fiber Attenuation * Km) + (Splice Attenuation * # of Splices) + (Connector Attenuation * # of Connectors) + (Optical Fiber or OADM) + Buffer(Fiber aging)) With regard to SONET/SDH optical calculations, what will the given formula provide?()

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Which device creates an OEO conversion?()

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In order to avoid misconnections due to a failed node in a Bidirectional Line Switched Ring (BLSR), Alarm Indication Signals (AISs) are sent on every channel normally terminating in that node. What is the name of this process?()

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