Plywood Base; Figure 24: Switch On A Wall With A Plywood Base - Allied Telesis AlliedWare Plus GS980M Series Installation Manual

Plywood Base

If you are installing the switch on a wall with wooden studs, Allied Telesis
recommends using a plywood base for the device. (A plywood base is not
required for a concrete wall.) Refer to Figure 24.
Wall

Plywood Base

Figure 24. Switch on a Wall with a Plywood Base
The plywood base should be mounted to two studs in the wall. The
recommended minimum dimensions of the plywood base for GS980M
Series switches are listed here:

Width: 55.9 centimeters (22 inches)

Height: 61.0 centimeters (24 inches)

Thickness: 2.5 centimeters (1 inch)
GS980M Series Installation Guide
Wall Studs
61