An arrayed waveguide grating (AWG) multiplexer/demultiplexer has the following advantages: short wavelength spacing, large number of channels, and flat passband. It suits DWDM systems with ultra-high speed and large capacity.
An unprotected chain consists of four NEs: NE1, NE2, NE3, and NE4. An end-to-end VC4 trail NE1—NE4 is created, and NE5 is added between NE2 and NE3 for capacity expansion. The original configuration remains unchanged, and no service is configured on NE5. In this case, the unprotected chain becomes NE1-NE2-NE5-NE3-NE4, and how many VC4 trails can be searched out?
In the SDH optical synchronous transmission system, which of the following bytes is used to transmit the quality and usage information of clock sources?
The standard Ethernet frame length should not be less than 64 bytes. Which of the following factors cause this limitation? (Multiple Choice)
In the 2.5G MSP ring consisting of four MSTP sites, when a protection switching occurs, which of the following statements about the alarm reporting is correct?
The device IP addresses of the gateway NE and non-gateway NEs must be set in the same network segment.
Which of the following operating systems support the installation of the U2000 client?
During the service configuration between two adjacent sites (NE1 and NE2), if VC4:1 and VC12:l-3 are used on the NEl's line board connected to NE2, the same VC4 and VC12 timeslots must be used on the NE2's line board connected to NE1.
After an optical fiber is connected according to the networking diagram, if a critical alarm is reported on the optical port, the SRV indicator on the line board is red.
The fiber core refractive index n1 must be ( ) the cladding layer refractive index n2, which is a necessary condition for transmitting optical signals in optical fibers.
Which of the following is the functional unit that provides the interfaces related to the orderwire phone and serial data for the system?
Which of the following can be configured as the monitoring time of NE performance events?
Which of the following factors determines that the optical signal-to-noise ratio (OSNR) at the receive end decreases to a certain extent After signals are transmitted for a certain distance in a WDM system, the optical signal-to-noise ratio (OSNR) at the receive end decreases to a certain extent. Which of the following is the main cause?
The SNCP switching speed can be improved if you classify the SNCP services that have the same source, sink, or route into groups.
The value of the MFAS byte increases with the sequence number of the OTUk/ODUk base frame, and a maximum of ( ) base frames are included.
Which of the following alarm/event dumping modes are supported by the U2000? (Multiple Choice)
By default, the B2-EXC alarm is reported when the number of B2 bit errors exceeds the ( ) threshold.
Outband networking requires higher costs than inband networking, but provides more reliable management channels.
TU-AIS is frequently encountered during network maintenance. Which of the following alarms can trigger the TU-AIS alarm? (Multiple Choice)
When a VLAN-based service type is configured, which of the following functions must be enabled on the port?