Combo Ports; Table 1 Combo Ports - Allied Telesis AT-GS950/8 Installation Manual

Combo Ports

The AT-GS950/8 and AT-GS950/16 Switches have two combo ports and
the AT-GS950/24 Switch has four combo ports. Each combo port consists
of one 10/100/1000Base-T twisted pair port and one slot for an optional
100Base-FX or 1000Base-SX/LX SFP transceiver. The twisted pair ports
are identified with the letter "R" for "Redundant" on the front faceplates of
the units. The ports and slots are listed in Table 1.
Switch
AT-GS950/8
AT-GS950/16
AT-GS950/24
The combo ports have the guidelines listed here:
Only one port in a pair — either the twisted pair port or a

corresponding SFP module — can be active at a time.
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.
The twisted pair port automatically changes to the redundant

status mode when an SFP module establishes a link with an end
node.
A twisted pair port automatically transitions back to the active

status when the link is lost on the SFP module.
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.
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.

Table 1 Combo Ports

Twisted Pair Port
7R
8R
15R
16R
21R
22R
23R
24R
SFP Slot
7
8
15
16
21
22
23
24
22