Allied Telesis AT-S25 - Manual (Page 78)

Section II: Local and Telnet Mangement
78
Guideline 8: Creating Port Trunks on Expansion Modules
The ports on some expansion modules can be grouped together to form
port trunks. Refer to Table 1 to determine if your expansion modules
support port trunking.
Table 1 Trunked Ports on Expansion Modules
Number of Ports on
Expansion Module
Port Trunks
1 Does not support port trunking.
2 One port trunk consisting of two ports.
4
One trunk consisting of two or four ports.