Maximum number of slave subracks that the TN11SCC board on OSN 6800 supports during capacity expansion

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No more than eight optical subracks, four electrical subracks, or eight optical and electrical subracks totally (no more than four electrical subracks). One OSN 8800 T32 subrack is equivalent to two OSN 6800 subracks.
1. The subrack quantity refers to the number of equivalent subracks. One OSN 6800 subrack is an equivalent subrack.
2. An electrical subrack is used to house cross-connect boards, OTU boards, tributary boards, line boards, and protection boards. For example, universal platform subracks and platform subracks are regarded as electrical subracks if they house only OTU boards (not in regeneration mode). Optical-electrical subracks are regarded as electrical subracks.
3. An optical subrack is used to house OADM boards, multiplexer boards, demultiplexer boards, optical amplifier boards, OSC boards, optical spectrum analyzer boards, regeneration boards, OLP boards (used in optical line protection), and OTU boards (in regeneration mode). For example, a subrack housing only protection boards is regarded as an optical subrack.

Other related questions:
Maximum number of slave subracks that can be connected to the master subrack of OSN 6800 during TN11SCC board expansion
At most eight optical subracks or four electrical subracks can be connected. One OSN 8800 T32 subrack is equivalent to two OSN 6800 subracks.

Whether TN52SCC boards can be installed in a slave OSN 6800 subrack
Yes, they can.

Whether TN52SCC can be used as the system control board in a slave subrack when the master subrack of the OSN 6800 uses TN11SCC as the system control board
If the software version of TN11SCC is later than 5.35 in the master subrack of the OSN 6800, TN52SCC can be configured in a slave subrack. To ensure automatic software synchronization, ensure that the TN11SCC software package includes the TN52SCC software package.

Precautions for replacing the system control board in a slave subrack of the OSN 6800
Before replacing a system control board, ensure that the spare board whose board type is the same as the system control board to be replaced. In addition, ensure that battery jumper on the spare board has been correctly set.

Specifications for slave subrack expansion on the master subrack of OSN 8800 T32
The TN52SCC board supports a total of 20 optical and electrical subracks, containing four or less electrical subracks. The TN51SCC board supports a total of eight optical and electrical subracks, containing four or less electrical subracks. The subracks run in master/slave mode. The number of subracks here indicates the number of equivalent subracks. One OSN 6800 subrack equals to one equivalent subrack, and one OSN 8800 T32 subrack equals to two equivalent subracks.

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