Single-fiber bidirectional WDM systems use only one optical fiber to transmit optical signals in both directions at the same time. Light signals in both directions should be arranged at different wavelengths.

The working mode of the port determines the flow control mode of the port.
When the operating mode is 100Mbit/s full duplex, one of the following flow control modes can be used

Which of the following bridges are used to forward data based on the MAC address and VLAN ID carried in the data?

An unprotected chain consists of four net elements; ME1, NE2, NE3 and NE4.
Create an end-to-end VC4 path NE1-NE4 and add NE5 between NE2 and NE3 for capacity expansion.
The original configuration remains unchanged and no services are configured on the NE5.
In this case, the unprotected chain becomes NE1-NE2-NE5NE3-NE4, how many VC4 paths can be searched?

If the overhead bytes pass through two plugged backplane buses, then the two slots are called paired slots that enable automatic transparent transfer of overhead bytes, such as (), () and (). Even if the SCC on the local network element The board is offline, which can also improve msP switching performance and protect DCC communication with other network elements. (Multi-quality selection).