Huawei OptiX PTN Series Quick Installation Manual page 9

Installing the Subrack
2 Subrack Architecture
The OptiX PTN 7900-24 subrack consists of the service board area, system control board area, switching fabric
area, power supply board area, Fan powered box area and cable routing area.
Fan slot 40
Fan slot 39
Cable trough
Fiber trough
Air intake vent
Fiber trough
Cable trough
Fan slot 30
Fan slot 29
Fiber trough
Air intake vent
Fiber trough
The functions of these components are as follows:
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Power interface board area
Power supply board area
Fan powered box area
Service board area
System control board area
Switching fabric area
Fiber trough
Cable trough
Air intake vent
Power interface board area: houses the PIU boards.
Power supply board area: houses the PSU boards.
Cable trough: for routing fibers.
Cable trough: for routing cables.
Air intake vent: air duct entrance.
Service board area: houses the processing boards.
System control board area: houses the system
control, communication, and auxiliary processing
boards (SCA boards).
Switching fabric area: houses the cross-connect
boards (XCS boards). (Slots 5-8 and 17-20 in a
cabinet support 400G cards.)