Allied Telesis 8100S Series - Manual (Page 34)

Chapter 1: Overview
34
SFP Slots
The switches have two slots for 100Mbps 100Base-FX or 1000Mbps
1000Base-SX/LX fiber optic transceivers. You may add transceivers to
connect the switches to other network devices over large distances, build
a high-speed backbone network between network devices, or connect
high-speed devices, such as servers, to your network.
The switches support a variety of short and long distance, 100 and 1000
Mbps fiber optic SFP modules. For a list of supported SFP modules,
contact your Allied Telesis representative or visit our web site.
The two SFP slots are paired with the 10/100/1000Base-T ports to form
combo ports. The combo ports are listed in Table 8.
The rules for using the combo ports are listed here:
 Only one port in a pair can be active at a time.
 The twisted pair port is the active port when the companion SFP
slot is empty, or when an SFP module is installed but has not
established a link to an end node.
 The switch automatically deactivates the twisted pair port of a
combo port when the companion SFP module establishes a
network link.
 The switch automatically reactivates the twisted pair port whenever
the companion SFP module loses its network link.
 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 8. Combo Ports
Model
10/100/1000
Base-T Port
SFP Slot
AT-8100S/24C, AT-8100S/24,
AT-8100S/24POE, AT-8100S/
16F8-LC, AT-8100S/16F8-SC,
and AT-8100S/24F-LC 25R 25
26R 26