Working Principle and Signal Flow

The TBE board consists of the client-side GE optical module, client-side 10GE optical module, L2 switching module, cross-connect module, control and communication module, and power supply module.

Functional Modules and Signal Flow

Figure 1 shows the functional modules and signal flow of the TBE board.

Figure 1 Functional modules and signal flow of the TBE board
NOTE:

The client-side GE optical module can be replaced with the electrical module to access the corresponding electrical signals.

Suggest change RX1/TX1, RX2/TX2 optical interfaces to electrical interfaces only.

The processing of electrical signals is similar to that of optical signals. The processing of optical signals is considered as an example.

Convergence of Multiple GE Services into 10GE Services

  • Positive process:
    • The client-side GE optical module receives eight channels of GE optical signals from client equipment through the RX1-RX8 interfaces, and performs O/E conversion.
    • After O/E conversion, the eight channels of GE electrical signals are sent to the L2 switching module. The eight channels of GE electrical signals are converged with a maximum of sixteen channels of GE electrical signals groomed from the cross-connect module into one channel of 10GE electrical signals.
    • The 10GE electrical signals are sent to the client-side 10GE optical module. After performing the E/O conversion, the module sends out 10GE optical signals through the TX optical interface.
  • Negative process:
    • The client-side 10GE optical module receives 10GE optical signals from client equipment through the RX interface, and performs O/E conversion.
    • After O/E conversion, 10GE electrical signals are sent to the L2 switching module. This module deconverges the one channel of 10GE electrical signals into multiple channels of GE electrical signals.
    • A maximum of eight channels of GE electrical signals are sent to the client-side GE optical module. After performing the E/O conversion, the module sends out GE optical signals through the TX1-TX8 optical interfaces.
    • A maximum of 16 channels of GE electrical signals are sent to other boards by the cross-connect module through the backplane.

Convergence or Transparent Transmission of GE-to-GE Services

  • Positive process:
    • The client-side GE optical module receives eight channels of GE optical signals from client equipment through the RX1-RX8 interfaces, and performs O/E conversion.
    • After O/E conversion, the eight channels of GE electrical signals are sent to the L2 switching module. Based on the service requirement, the L2 switching module either transparently transmits the received GE signals or converges the received multiple channels of flat-rate GE signals into one channel of GE signals.
    • The GE signals are sent to other boards by the cross-connect module through the backplane.
  • Negative process:
    • The cross-connect module receives the GE electrical signals groomed from other boards through the backplane.
    • GE electrical signals are sent to the L2 switching module. The L2 switching module either transparently transmits the received GE signals or deconverges the received GE signals into multiple channels of flat-rate GE signals.
    • The client-side GE optical module performs the E/O conversion of GE electrical signals, and then outputs the optical signals through the TX optical interface.

Module Function

  • Client-side optical moduleThe module consists of a client-side receiver and a client-side transmitter.
    • Client-side receiver: Performs O/E conversion of GE/10GE optical signals.
    • Client-side transmitter: Performs the E/O conversion from the internal electrical signals to GE/10GE optical signals.
    • Reports the performance of the client-side optical interface.
    • Reports the working state of the client-side laser.
  • L2 switching module
    • Forwards service signals.
    • Implements the convergence/deconvergence of the service signals.
  • Cross-connect module
    • Implements cross-connecting 16 GE signals to the other boards through the backplane.
    • The grooming service signals are GE signals.
    • OptiX OSN 6800: Supports cross-connecting 16 channels of GE signals to the central working/protection cross-connect board.
    • OptiX OSN 3800: Supports the grooming of 16 channels of GE signals from one board of the mesh group (consisting of four boards) to the other three boards belonging to the mesh group.
  • Control and communication module
    • Controls operations on the board.
    • Controls operations on each module of the board according to CPU instructions.
    • Collects information about alarms, performance events, working states and voltage detection from each functional module on the board.
    • Communicates with the system control and communication board.
  • Power supply moduleConverts the DC power supplied by the backplane into the power required by each module on the board.

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