Allied Telesis AT-GS950/8POE - Manual (Page 24)

Chapter 1: Overview
24
Redundant Twisted Pair Ports
Two of the twisted pair ports on the AT-GS950/8POE switch are paired
with SFP slots. The twisted pair ports are identified with the letter “R” for
“Redundant” as part of their number on the faceplate of the unit. Ports 7
and 8 are the redundant ports.
For combo ports 7 and 8, the copper and SPF ports share the same
bandwidth and cannot be activated simultaneously. If both the SFP and
the copper ports are connected simultaneously, the SPF port has
precedence over the copper port. Follow these guidelines when using
ports 7 and 8:
ˆ Only one port in a pair can be active at a time. It can be either the
twisted pair port or the corresponding SFP module.
ˆ The twisted pair port is the active port when its SFP slot is empty, or
when an SFP module is installed but has not established a link to an
end node.
ˆ The twisted pair port automatically changes to the redundant status
mode when an SFP module establishes a link with an end node.
ˆ A twisted pair port automatically transitions back to the active status
when the link is lost on the SFP module.
ˆ In nearly all cases, a twisted pair port and an SFP module share the
same configuration settings, including port settings, VLAN
assignments, access control lists, and Spanning Tree Protocol
settings.
ˆ An exception to the shared settings is port speed. If you disable Auto-
Negotiation on a twisted pair port and set the speed and duplex mode
manually, the speed reverts to Auto-Negotiation when an SFP module
establishes a link with an end node.