How Signals Are Selected When the DCP Board Is Used

This section describes how signals are selected when the DCP board is used.

Product

OptiX OSN 6800

OptiX OSN 8800

Fault Type

Optical Protection Unit

Symptom

None.

Cause Analysis

When the DCP board is not used for protection but physically connect to an OTU board through the RI11 and RI12 optical interfaces to receive the client-side signals on the OTU board, the difference between the receive optical power values at the two optical interfaces is small and the receive optical power values are in the normal range. In this case, you need to observe the following points.

• When the DCP board is running:
  • Because protection is not configured, the DCP board does not perform protection switching regardless of the channel status. That is, the system receives signals from the RI11 or RI12 optical interface even when no signal is available at the RI11 or RI12 optical interface.
• When the DCP board is powered off:
  • The system always receives signals from the RI12 optical interface no matter whether signals are available at the RI11 or RI12 optical interface.

When the DCP board is used for configuring Inter-subrack client 1+1 protection or Intra-subrack client 1+1 protection and connects to an OTU board through the RI11 and RI12 optical interfaces to receive the client-side signals on the OTU board, the difference between the receive optical power values at the two optical interfaces is small and the receive optical power values are in the normal range. In this case, you need to observe the following points.

• When the DCP board is running:
  • With protection configured, the system selectively receives signals on the working channel by default, that is, the system receives signals from the RI11 optical interface.
  • When no signal is available at the RI11 optical interface, the system selectively receives signals from the RI12 optical interface (protection channel).
  • When no signal is available at the RI12 optical interface, the system selectively receives signals from the RI11 optical interface (working channel).
• When the DCP board is powered off:
  • The system selectively receives signals from the RI12 optical interface no matter whether signals are available at the RI11 or RI12 optical interface.

Procedure

1. None.

Result

The problem is resolved.

Reference Information

None.

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