Allied Telesis AT-IX5-28GPX Installation Manual page 43

IX5-28GPX Installation Guide
Here are the transceiver guidelines:
The stacking transceivers may only be used in the stacking slots
and only with the VCStack feature. You may not use the
transceivers as regular networking ports.
The AT-StackOP/0.3 and AT-StackOP/9.0 transceivers must be
connected to other AT-StackOP/0.3 and AT-StackOP/9.0
transceivers. The transceivers do not work with other types of
network devices.
You may use different types of transceivers to connect the
switches of a stack and so build stacks of switches that are at
various distances from each other.
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