What Is the difference between an NE5000E back-to-back switching network board and a stand-alone switching network board?
1. The NE5000E back-to-back switching board is a switching network expansion board SFE. The SFE is the switching network unit of the NE5000E back-to-back cascading system and switches the service data of the whole back-to-back cascading system.
2. An SFE board completes the same functions as the SFU. In the single-shelf mode of the back-to-back cascading system, the SFU board and SFE board can be intermixed.
3. Each SFE provides four optical module slots. In the NE5000E back-to-back cascading system, the capacity of the switching network is expanded through inter-SFE concurrent fiber interconnection between the master shelf and slave shelf. This expands the 1.28 T switching capacity of in a single shelf to 2.56 T switching capacity in dual shelves.
4. In the dual-frame mode of a back-to-back cascading system, the switching is performed among a total of 32 LPUs. The switching is finished by eight SEF boards in the two shelves. Each SFE board needs to establish data channels not only with all the LPUs within the local shelf, but also with the LPUs in the peer shelf. The former can be implemented through the backplane in the shelf, while the latter can be implemented through the switching channel established on short-haul optical interconnection VSR interface among network boards.
5. An independent monitoring channel is also set on an SFE board to monitor the voltage, current, and temperature, provide overvoltage, overcurrent, and overheat protection, and support the power-on or -off control and power-on sequence control of the working power supply of the board.